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From articles published in Journal of Powder Materials during the past two years (2023 ~ ).

Research Article
Article image
[Korean]
Development of Composite-film-based Flexible Energy Harvester using Lead-free BCTZ Piezoelectric Nanomaterials
Gwang Hyeon Kim, Hyeon Jun Park, Bitna Bae, Haksu Jang, Cheol Min Kim, Donghun Lee, Kwi-Il Park
J Powder Mater. 2024;31(1):16-22.   Published online February 28, 2024
DOI: https://doi.org/10.4150/KPMI.2024.31.1.16
  • 536 View
  • 22 Download
  • 7 Citations
AbstractAbstract PDF
Composite-based piezoelectric devices are extensively studied to develop sustainable power supply and selfpowered devices owing to their excellent mechanical durability and output performance. In this study, we design a leadfree piezoelectric nanocomposite utilizing (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 (BCTZ) nanomaterials for realizing highly flexible energy harvesters. To improve the output performance of the devices, we incorporate porous BCTZ nanowires (NWs) into the nanoparticle (NP)-based piezoelectric nanocomposite. BCTZ NPs and NWs are synthesized through the solidstate reaction and sol-gel-based electrospinning, respectively; subsequently, they are dispersed inside a polyimide matrix. The output performance of the energy harvesters is measured using an optimized measurement system during repetitive mechanical deformation by varying the composition of the NPs and NWs. A nanocomposite-based energy harvester with 4:1 weight ratio generates the maximum open-circuit voltage and short-circuit current of 0.83 V and 0.28 A, respectively. In this study, self-powered devices are constructed with enhanced output performance by using piezoelectric energy harvesting for application in flexible and wearable devices.

Citations

Citations to this article as recorded by  
  • Long‐Lasting, Steady and Enhanced Energy Harvesting by Inserting a Conductive Layer into the Piezoelectric Polymer
    HakSu Jang, Gwang Hyeon Kim, Dong Won Jeon, Hyeon Jun Park, BitNa Bae, Nagamalleswara Rao Alluri, Cheol Min Kim, Changyeon Baek, Min‐Ku Lee, Sung Beom Cho, Gyoung‐Ja Lee, Kwi‐Il Park
    Advanced Functional Materials.2025;[Epub]     CrossRef
  • Flexible hybrid thermoelectric films made of bismuth telluride-PEDOT:PSS composites enabled by freezing-thawing process and simple chemical treatment
    Cheol Min Kim, Seoha Kim, Nagamalleswara Rao Alluri, Bitna Bae, Momanyi Amos Okirigiti, Gwang Hyun Kim, Hyeon Jun Park, Haksu Jang, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Kwi-Il Park
    Materials Today Chemistry.2025; 44: 102532.     CrossRef
  • Dual-controlled piezoelectric composite film with enhanced crystallinity and defect-free via solvent vapor treatment
    HakSu Jang, Hyeon Jun Park, Gwang Hyeon Kim, Cheol Min Kim, Nagamalleswara Rao Alluri, BitNa Bae, HyoMin Jeon, DongHun Lee, Kwi-Il Park
    Nano Energy.2025; 136: 110705.     CrossRef
  • Optimized Process and Mechanical and Electrical Analysis of Polyimide/Pb(Zr,Ti)O3-Based Flexible Piezoelectric Composites
    Junki Lee, Sang-il Yoon, Hyunseung Kim, Chang Kyu Jeong
    Journal of Powder Materials.2025; 32(1): 16.     CrossRef
  • Flexible Thermoelectric Energy Harvester with Stacked Structure of Thermoelectric Composite Films Made of PVDF and Bi2Te3-Based Particles
    Da Eun Shin, Nagamalleswara Rao Alluri, Kwi-Il Park
    ACS Applied Energy Materials.2024; 7(19): 8288.     CrossRef
  • Enhanced energy harvesting of fibrous composite membranes via plasma-piezopolymer interaction
    Hyeon Jun Park, Bitna Bae, HakSu Jang, Dong Yeol Hyeon, Dong Hun Lee, Gwang Hyun Kim, Cheol Min Kim, Nagamalleswara Rao Alluri, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Kwi-Il Park
    Nano Energy.2024; 131: 110299.     CrossRef
  • CoFe2O4-BaTiO3 core-shell-embedded flexible polymer composite as an efficient magnetoelectric energy harvester
    Bitna Bae, Nagamalleswara Rao Alluri, Cheol Min Kim, Jungho Ryu, Gwang Hyeon Kim, Hyeon Jun Park, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Geon-Tae Hwang, Kwi-Il Park
    Materials Today Physics.2024; 48: 101567.     CrossRef
Article
Article image
[Korean]
Effect of Bulk Shape on Mechanical Properties of Ti-6Al-4V Alloy Manufactured by Laser Powder Bed Fusion
Haeum Park, Yeon Woo Kim, Seungyeon Lee, Kyung Tae Kim, Ji-Hun Yu, Jung Gi Kim, Jeong Min Park
J Powder Mater. 2023;30(2):140-145.   Published online April 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.2.140
  • 1,018 View
  • 18 Download
  • 5 Citations
AbstractAbstract PDF

Although the Ti–6Al–4V alloy has been used in the aircraft industry owing to its excellent mechanical properties and low density, the low formability of the alloy hinders broadening its applications. Recently, laser-powder bed fusion (L-PBF) has become a novel process for overcoming the limitations of the alloy (i.e., low formability), owing to the high degree of design freedom for the geometry of products having outstanding performance used in hightech applications. In this study, to investigate the effect of bulk shape on the microstructure and mechanical properties of L-PBFed Ti-6Al-4V alloys, two types of samples are fabricated using L-PBF: thick and thin samples. The thick sample exhibits lower strength and higher ductility than the thin sample owing to the larger grain size and lower residual dislocation density of the thick sample because of the heat input during the L-PBF process.

Citations

Citations to this article as recorded by  
  • Cryogenic Tensile Behavior of Ferrous Medium-entropy Alloy Additively Manufactured by Laser Powder Bed Fusion
    Seungyeon Lee, Kyung Tae Kim, Ji-Hun Yu, Hyoung Seop Kim, Jae Wung Bae, Jeong Min Park
    journal of Korean Powder Metallurgy Institute.2024; 31(1): 8.     CrossRef
  • Microstructural Evolution and Mechanical Properties of Ti-6Al-4V Alloy through Selective Laser Melting: Comprehensive Study on the Effect of Hot Isostatic Pressing (HIP)
    Gargi Roy, Raj Narayan Hajra, Woo Hyeok Kim, Jongwon Lee, Sangwoo Kim, Jeoung Han Kim
    journal of Korean Powder Metallurgy Institute.2024; 31(1): 1.     CrossRef
  • Data-driven Approach to Explore the Contribution of Process Parameters for Laser Powder Bed Fusion of a Ti-6Al-4V Alloy
    Jeong Min Park, Jaimyun Jung, Seungyeon Lee, Haeum Park, Yeon Woo Kim, Ji-Hun Yu
    journal of Korean Powder Metallurgy Institute.2024; 31(2): 137.     CrossRef
  • A Parametric Study on the L-PBF Process of an AlSi10Mg Alloy for High-Speed Productivity of Automotive Prototype Parts
    Yeonha Chang, Hyomoon Joo, Wanghyun Yong, Yeongcheol Jo, Seongjin Kim, Hanjae Kim, Yeon Woo Kim, Kyung Tae Kim, Jeong Min Park
    Journal of Powder Materials.2024; 31(5): 390.     CrossRef
  • High-speed manufacturing-driven strength-ductility improvement of H13 tool steel fabricated by selective laser melting
    Yeon Woo Kim, Haeum Park, Young Seong Eom, Dong Gill Ahn, Kyung Tae Kim, Ji-hun Yu, Yoon Suk Choi, Jeong Min Park
    Powder Metallurgy.2023; 66(5): 582.     CrossRef
Research Articles
Article image
[English]
Microstructural Evolution and Mechanical Properties of Ti-6Al-4V Alloy through Selective Laser Melting: Comprehensive Study on the Effect of Hot Isostatic Pressing (HIP)
Gargi Roy, Raj Narayan Hajra, Woo Hyeok Kim, Jongwon Lee, Sangwoo Kim, Jeoung Han Kim
J Powder Mater. 2024;31(1):1-7.   Published online February 28, 2024
DOI: https://doi.org/10.4150/KPMI.2024.31.1.1
  • 2,182 View
  • 89 Download
  • 4 Citations
AbstractAbstract PDF

This study explores the profound impact of varying oxygen content on microstructural and mechanical properties in specimens HO and LO. The higher oxygen concentration in specimen HO is found to significantly influence alpha lath sizes, resulting in a size of 0.5-1 μm, contrasting with the 1-1.5 μm size observed in specimen LO. Pore fraction, governed by oxygen concentration, is high in specimen HO, registering a value of 0.11%, whereas specimen LO exhibits a lower pore fraction (0.02%). Varied pore types in each specimen further underscore the role of oxygen concentration in shaping microstructural morphology. Despite these microstructural variations, the average hardness remains consistent at ~370 HV. This study emphasizes the pivotal role of oxygen content in influencing microstructural features, contributing to a comprehensive understanding of the intricate interplay between elemental composition and material properties.

Citations

Citations to this article as recorded by  
  • Mechanical response and microstructural evolution of a composite joint fabricated by green laser dissimilar welding of VCoNi medium entropy alloy and 17-4PH stainless steel
    Hadiseh Esmaeilpoor, Mahdi Aghaahmadi, Hyun Jong Yoo, Chan Woong Park, Tae Jin Jang, Seok Su Sohn, Jeoung Han Kim
    Journal of Materials Science & Technology.2025; 213: 223.     CrossRef
  • High-integrity diffusion bonding of laser powder bed fused, forged, and rolled Ti–6Al–4V alloys
    Seoyeon Jeon, Hyunjong Ha, Dong Jun Lee, Hyeonil Park, Yong Nam Kwon, Hyunjoo Choi, Hyokyung Sung
    Journal of Materials Research and Technology.2025; 35: 2108.     CrossRef
  • Comparative Review of the Microstructural and Mechanical Properties of Ti-6Al-4V Fabricated via Wrought and Powder Metallurgy Processes
    Raj Narayan Hajra, Gargi Roy, An Seong Min, Hyunseok Lee, Jeoung Han Kim
    Journal of Powder Materials.2024; 31(5): 365.     CrossRef
  • A Parametric Study on the L-PBF Process of an AlSi10Mg Alloy for High-Speed Productivity of Automotive Prototype Parts
    Yeonha Chang, Hyomoon Joo, Wanghyun Yong, Yeongcheol Jo, Seongjin Kim, Hanjae Kim, Yeon Woo Kim, Kyung Tae Kim, Jeong Min Park
    Journal of Powder Materials.2024; 31(5): 390.     CrossRef
Article image
[English]
Exploring Thermoelectric Transport Properties and Band Parameters of n-Type Bi2-xSbxTe3 Compounds Using the Single Parabolic Band Model
Linh Ba Vu, Soo-ho Jung, Jinhee Bae, Jong Min Park, Kyung Tae Kim, Injoon Son, Seungki Jo
J Powder Mater. 2024;31(2):119-125.   Published online April 30, 2024
DOI: https://doi.org/10.4150/jpm.2024.00045
  • 1,221 View
  • 60 Download
  • 3 Citations
AbstractAbstract PDF
The n-type Bi2-xSbxTe3 compounds have been of great interest due to its potential to achieve a high thermoelectric performance, comparable to that of p-type Bi2-xSbxTe3. However, a comprehensive understanding on the thermoelectric properties remains lacking. Here, we investigate the thermoelectric transport properties and band characteristics of n-type Bi2-xSbxTe3 (x = 0.1 – 1.1) based on experimental and theoretical considerations. We find that the higher power factor at lower Sb content results from the optimized balance between the density of state effective mass and nondegenerate mobility. Additionally, a higher carrier concentration at lower x suppresses bipolar conduction, thereby reducing thermal conductivity at elevated temperatures. Consequently, the highest zT of ~ 0.5 is observed at 450 K for x = 0.1 and, according to the single parabolic band model, it could be further improved by ~70 % through carrier concentration tuning.

Citations

Citations to this article as recorded by  
  • Review of “Integrated Computer-Aided Process Engineering Session in the 17th International Symposium on Novel and Nano Materials (ISNNM, 14–18 November 2022)”
    Yeon-Joo Lee, Pil-Ryung Cha, Hyoung-Seop Kim, Hyun-Joo Choi
    MATERIALS TRANSACTIONS.2025; 66(1): 144.     CrossRef
  • Enhanced energy harvesting performance of bendable thermoelectric generator enabled by trapezoidal-shaped legs
    Momanyi Amos Okirigiti, Cheol Min Kim, Hyejeong Choi, Nagamalleswara Rao Alluri, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Kwi-Il Park
    Journal of Power Sources.2025; 631: 236254.     CrossRef
  • Flexible hybrid thermoelectric films made of bismuth telluride-PEDOT:PSS composites enabled by freezing-thawing process and simple chemical treatment
    Cheol Min Kim, Seoha Kim, Nagamalleswara Rao Alluri, Bitna Bae, Momanyi Amos Okirigiti, Gwang Hyun Kim, Hyeon Jun Park, Haksu Jang, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Kwi-Il Park
    Materials Today Chemistry.2025; 44: 102532.     CrossRef
Articles
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[Korean]
Combinatorial Experiment for Al-6061 and Al-12Si alloy Based on Directed Energy Deposition (DED) Process
Seoyeon Jeon, Suwon Park, Yongwook Song, Jiwon Park, Hyunyoung Park, Boram Lee, Hyunjoo Choi
J Powder Mater. 2023;30(6):463-469.   Published online December 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.6.463
  • 1,022 View
  • 35 Download
  • 3 Citations
AbstractAbstract PDF

Aluminum alloys, known for their high strength-to-weight ratios and impressive electrical and thermal conductivities, are extensively used in numerous engineering sectors, such as aerospace, automotive, and construction. Recently, significant efforts have been made to develop novel aluminum alloys specifically tailored for additive manufacturing. These new alloys aim to provide an optimal balance between mechanical properties and thermal/ electrical conductivities. In this study, nine combinatorial samples with various alloy compositions were fabricated using direct energy deposition (DED) additive manufacturing by adjusting the feeding speeds of Al6061 alloy and Al-12Si alloy powders. The effects of the alloying elements on the microstructure, electrical conductivity, and hardness were investigated. Generally, as the Si and Cu contents decreased, electrical conductivity increased and hardness decreased, exhibiting trade-off characteristics. However, electrical conductivity and hardness showed an optimal combination when the Si content was adjusted to below 4.5 wt%, which can sufficiently suppress the grain boundary segregation of the α- Si precipitates, and the Cu content was controlled to induce the formation of Al2Cu precipitates.

Citations

Citations to this article as recorded by  
  • Trends in Materials Modeling and Computation for Metal Additive Manufacturing
    Seoyeon Jeon, Hyunjoo Choi
    journal of Korean Powder Metallurgy Institute.2024; 31(3): 213.     CrossRef
  • The Challenges and Advances in Recycling/Re-Using Powder for Metal 3D Printing: A Comprehensive Review
    Alex Lanzutti, Elia Marin
    Metals.2024; 14(8): 886.     CrossRef
  • Microstructural Effects on the Mechanical Properties of Ti-6Al-4V Fabricated by Direct Energy Deposition
    Juho Kim, Seoyeon Jeon, Hwajin Park, Taeyoel Kim, Hyunjoo Choi
    Journal of Powder Materials.2024; 31(4): 302.     CrossRef
Article image
[Korean]
Exploration of Aluminum Alloy using Multi-feeder 3D Additive Manufacturing-based Combinatorial Experiment
Suwon Park, Yongwook Song, Jiyoon Yeo, Songyun Han, Hyunjoo Choi
J Powder Mater. 2023;30(3):255-261.   Published online June 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.3.255
  • 574 View
  • 4 Download
  • 3 Citations
AbstractAbstract PDF

Aluminum alloys are widely utilized in diverse industries, such as automobiles, aerospace, and architecture, owing to their high specific strength and resistance to oxidation. However, to meet the increasing demands of the industry, it is necessary to design new aluminum alloys with excellent properties. Thus, a new method is required to efficiently test additively manufactured aluminum alloys with various compositions within a short period during the alloy design process. In this study, a combinatory approach using a direct energy deposition system for metal 3D printing process with a dual feeder was employed. Two types of aluminum alloy powders, namely Al6061 and Al-12Cu, were utilized for the combinatory test conducted through 3D printing. Twelve types of Al-Si-Cu-Mg alloys were manufactured during this combinatory test, and the relationship between their microstructures and properties was investigated.

Citations

Citations to this article as recorded by  
  • Trends in Materials Modeling and Computation for Metal Additive Manufacturing
    Seoyeon Jeon, Hyunjoo Choi
    journal of Korean Powder Metallurgy Institute.2024; 31(3): 213.     CrossRef
  • Microstructural Effects on the Mechanical Properties of Ti-6Al-4V Fabricated by Direct Energy Deposition
    Juho Kim, Seoyeon Jeon, Hwajin Park, Taeyoel Kim, Hyunjoo Choi
    Journal of Powder Materials.2024; 31(4): 302.     CrossRef
  • Combinatorial Experiment for Al-6061 and Al-12Si alloy Based on Directed Energy Deposition (DED) Process
    Seoyeon Jeon, Suwon Park, Yongwook Song, Jiwon Park, Hyunyoung Park, Boram Lee, Hyunjoo Choi
    journal of Korean Powder Metallurgy Institute.2023; 30(6): 463.     CrossRef
Article image
[Korean]
A Study on the Optimal Design of Ti-6Al-4V Lattice Structure Manufactured by Laser Powder Bed Fusion Process
Ji-Yoon Kim, Jeongmin Woo, Yongho Sohn, Jeong Ho Kim, Kee-Ahn Lee
J Powder Mater. 2023;30(2):146-155.   Published online April 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.2.146
  • 679 View
  • 12 Download
  • 3 Citations
AbstractAbstract PDF

The Ti-6Al-4V lattice structure is widely used in the aerospace industry owing to its high specific strength, specific stiffness, and energy absorption. The quality, performance, and surface roughness of the additively manufactured parts are significantly dependent on various process parameters. Therefore, it is important to study process parameter optimization for relative density and surface roughness control. Here, the part density and surface roughness are examined according to the hatching space, laser power, and scan rotation during laser-powder bed fusion (LPBF), and the optimal process parameters for LPBF are investigated. It has high density and low surface roughness in the specific process parameter ranges of hatching space (0.06–0.12 mm), laser power (225–325 W), and scan rotation (15°). In addition, to investigate the compressive behavior of the lattice structure, a finite element analysis is performed based on the homogenization method. Finite element analysis using the homogenization method indicates that the number of elements decreases from 437,710 to 27 and the analysis time decreases from 3,360 to 9 s. In addition, to verify the reliability of this method, stress–strain data from the compression test and analysis are compared.

Citations

Citations to this article as recorded by  
  • Enhanced Microstructure and Wear Resistance of Ti–6Al–4V Alloy with Vanadium Carbide Coating via Directed Energy Deposition
    Ui Jun Ko, Ju Hyeong Jung, Jung Hyun Kang, Kyunsuk Choi, Jeoung Han Kim
    Materials.2024; 17(3): 733.     CrossRef
  • Microstructural Evolution and Mechanical Properties of Ti-6Al-4V Alloy through Selective Laser Melting: Comprehensive Study on the Effect of Hot Isostatic Pressing (HIP)
    Gargi Roy, Raj Narayan Hajra, Woo Hyeok Kim, Jongwon Lee, Sangwoo Kim, Jeoung Han Kim
    journal of Korean Powder Metallurgy Institute.2024; 31(1): 1.     CrossRef
  • Data-driven Approach to Explore the Contribution of Process Parameters for Laser Powder Bed Fusion of a Ti-6Al-4V Alloy
    Jeong Min Park, Jaimyun Jung, Seungyeon Lee, Haeum Park, Yeon Woo Kim, Ji-Hun Yu
    journal of Korean Powder Metallurgy Institute.2024; 31(2): 137.     CrossRef
Article image
[Korean]
Thermoelectric Performance Enhancement of Sintered Bi-Te Pellets by Rotary-type Atomic Layer Deposition
Myeong Jun Jung, Ji Young Park, Su Min Eun, Byung Joon Choi
J Powder Mater. 2023;30(2):130-139.   Published online April 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.2.130
  • 451 View
  • 5 Download
  • 3 Citations
AbstractAbstract PDF

Thermoelectric materials and devices are energy-harvesting devices that can effectively recycle waste heat into electricity. Thermoelectric power generation is widely used in factories, engines, and even in human bodies as they continuously generate heat. However, thermoelectric elements exhibit poor performance and low energy efficiency; research is being conducted to find new materials or improve the thermoelectric performance of existing materials, that is, by ensuring a high figure-of-merit (zT) value. For increasing zT, higher σ (electrical conductivity) and S (Seebeck coefficient) and a lower к (thermal conductivity) are required. Here, interface engineering by atomic layer deposition (ALD) is used to increase zT of n-type BiTeSe (BTS) thermoelectric powders. ALD of the BTS powders is performed in a rotary-type ALD reactor, and 40 to 100 ALD cycles of ZnO thin films are conducted at 100°C. The physical and chemical properties and thermoelectric performance of the ALD-coated BTS powders and pellets are characterized. It is revealed that electrical conductivity and thermal conductivity are decoupled, and thus, zT of ALD-coated BTS pellets is increased by more than 60% compared to that of the uncoated BTS pellets. This result can be utilized in a novel method for improving the thermoelectric efficiency in materials processing.

Citations

Citations to this article as recorded by  
  • Highly deformable and hierarchical 3D composite sponge for versatile thermoelectric energy conversion
    Jong Min Park, Changyeon Baek, Min-Ku Lee, Nagamalleswara Rao Alluri, Gyoung-Ja Lee, Kyung Tae Kim, Kwi-Il Park
    Applied Surface Science.2025; 692: 162730.     CrossRef
  • Investigation of the Thermal-to-Electrical Properties of Transition Metal-Sb Alloys Synthesized for Thermoelectric Applications
    Jong Min Park, Seungki Jo, Sooho Jung, Jinhee Bae, Linh Ba Vu, Kwi-Il Park, Kyung Tae Kim
    journal of Korean Powder Metallurgy Institute.2024; 31(3): 236.     CrossRef
  • Enhancing Electrical Properties of N-type Bismuth Telluride Alloys through Graphene Oxide Incorporation in Extrusion 3D Printing
    Jinhee Bae, Seungki Jo, Kyung Tae Kim
    journal of Korean Powder Metallurgy Institute.2023; 30(4): 318.     CrossRef
Article image
[Korean]
Enhancement of Thermoelectric Performance in Spark Plasma Sintered p-Type Bi0.5Sb1.5Te3.0 Compound via Hot Isostatic Pressing (HIP) Induced Reduction of Lattice Thermal Conductivity
Soo-Ho Jung, Ye Jin Woo, Kyung Tae Kim, Seungki Jo
J Powder Mater. 2023;30(2):123-129.   Published online April 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.2.123
  • 690 View
  • 5 Download
  • 3 Citations
AbstractAbstract PDF

High-temperature and high-pressure post-processing applied to sintered thermoelectric materials can create nanoscale defects, thereby enhancing their thermoelectric performance. Here, we investigate the effect of hot isostatic pressing (HIP) as a post-processing treatment on the thermoelectric properties of p-type Bi0.5Sb1.5Te3.0 compounds sintered via spark plasma sintering. The sample post-processed via HIP maintains its electronic transport properties despite the reduced microstructural texturing. Moreover, lattice thermal conductivity is significantly reduced owing to activated phonon scattering, which can be attributed to the nanoscale defects created during HIP, resulting in an ~18% increase in peak zT value, which reaches ~1.43 at 100°C. This study validates that HIP enhances the thermoelectric performance by controlling the thermal transport without having any detrimental effects on the electronic transport properties of thermoelectric materials.

Citations

Citations to this article as recorded by  
  • Exploring Thermoelectric Transport Properties and Band Parameters of n-Type Bi2-xSbxTe3 Compounds Using the Single Parabolic Band Model
    Linh Ba Vu, Soo-ho Jung, Jinhee Bae, Jong Min Park, Kyung Tae Kim, Injoon Son, Seungki Jo
    journal of Korean Powder Metallurgy Institute.2024; 31(2): 119.     CrossRef
  • Investigation of the Thermal-to-Electrical Properties of Transition Metal-Sb Alloys Synthesized for Thermoelectric Applications
    Jong Min Park, Seungki Jo, Sooho Jung, Jinhee Bae, Linh Ba Vu, Kwi-Il Park, Kyung Tae Kim
    journal of Korean Powder Metallurgy Institute.2024; 31(3): 236.     CrossRef
  • Enhancing Electrical Properties of N-type Bismuth Telluride Alloys through Graphene Oxide Incorporation in Extrusion 3D Printing
    Jinhee Bae, Seungki Jo, Kyung Tae Kim
    journal of Korean Powder Metallurgy Institute.2023; 30(4): 318.     CrossRef
Research Articles
Article image
[English]
Investigation of the Thermal-to-Electrical Properties of Transition Metal-Sb Alloys Synthesized for Thermoelectric Applications
Jong Min Park, Seungki Jo, Sooho Jung, Jinhee Bae, Linh Ba Vu, Kwi-Il Park, Kyung Tae Kim
J Powder Mater. 2024;31(3):236-242.   Published online June 27, 2024
DOI: https://doi.org/10.4150/jpm.2024.00031
  • 626 View
  • 33 Download
  • 2 Citations
AbstractAbstract PDF
The development of thermoelectric (TE) materials to replace Bi2Te3 alloys is emerging as a hot issue with the potential for wider practical applications. In particular, layered Zintl-phase materials, which can appropriately control carrier and phonon transport behaviors, are being considered as promising candidates. However, limited data have been reported on the thermoelectric properties of metal-Sb materials that can be transformed into layered materials through the insertion of cations. In this study, we synthesized FeSb and MnSb, which are used as base materials for advanced thermoelectric materials. They were confirmed as single-phase materials by analyzing X-ray diffraction patterns. Based on electrical conductivity, the Seebeck coefficient, and thermal conductivity of both materials characterized as a function of temperature, the zT values of MnSb and FeSb were calculated to be 0.00119 and 0.00026, respectively. These properties provide a fundamental data for developing layered Zintl-phase materials with alkali/alkaline earth metal insertions.

Citations

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  • Improving thermoelectric properties of CuMnSb alloys via strategic alloying with magnetic MnSb and Cu
    Jong Min Park, Seungki Jo, Soo-ho Jung, Jinhee Bae, Linh Ba Vu, Jihun Yu, Kyung Tae Kim
    Materials Letters.2025; 381: 137796.     CrossRef
  • Highly deformable and hierarchical 3D composite sponge for versatile thermoelectric energy conversion
    Jong Min Park, Changyeon Baek, Min-Ku Lee, Nagamalleswara Rao Alluri, Gyoung-Ja Lee, Kyung Tae Kim, Kwi-Il Park
    Applied Surface Science.2025; 692: 162730.     CrossRef
Article image
[English]
Cryogenic Tensile Behavior of Ferrous Medium-entropy Alloy Additively Manufactured by Laser Powder Bed Fusion
Seungyeon Lee, Kyung Tae Kim, Ji-Hun Yu, Hyoung Seop Kim, Jae Wung Bae, Jeong Min Park
J Powder Mater. 2024;31(1):8-15.   Published online February 28, 2024
DOI: https://doi.org/10.4150/KPMI.2024.31.1.8
  • 2,421 View
  • 119 Download
  • 2 Citations
AbstractAbstract PDF

The emergence of ferrous-medium entropy alloys (FeMEAs) with excellent tensile properties represents a potential direction for designing alloys based on metastable engineering. In this study, an FeMEA is successfully fabricated using laser powder bed fusion (LPBF), a metal additive manufacturing technology. Tensile tests are conducted on the LPBF-processed FeMEA at room temperature and cryogenic temperatures (77 K). At 77 K, the LPBF-processed FeMEA exhibits high yield strength and excellent ultimate tensile strength through active deformation-induced martensitic transformation. Furthermore, due to the low stability of the face-centered cubic (FCC) phase of the LPBF-processed FeMEA based on nano-scale solute heterogeneity, stress-induced martensitic transformation occurs, accompanied by the appearance of a yield point phenomenon during cryogenic tensile deformation. This study elucidates the origin of the yield point phenomenon and deformation behavior of the FeMEA at 77 K.

Citations

Citations to this article as recorded by  
  • Cryogenic tensile behavior of carbon-doped CoCrFeMnNi high-entropy alloys additively manufactured by laser powder bed fusion
    Haeum Park, Hyeonseok Kwon, Kyung Tae Kim, Ji-Hun Yu, Jungho Choe, Hyokyung Sung, Hyoung Seop Kim, Jung Gi Kim, Jeong Min Park
    Additive Manufacturing.2024; 86: 104223.     CrossRef
  • Recent progress in high-entropy alloys for laser powder bed fusion: Design, processing, microstructure, and performance
    Asker Jarlöv, Zhiguang Zhu, Weiming Ji, Shubo Gao, Zhiheng Hu, Priyanka Vivegananthan, Yujia Tian, Devesh Raju Kripalani, Haiyang Fan, Hang Li Seet, Changjun Han, Liming Tan, Feng Liu, Mui Ling Sharon Nai, Kun Zhou
    Materials Science and Engineering: R: Reports.2024; 161: 100834.     CrossRef
Review Paper
Article image
[English]
Eco-Friendly Powder and Particles-Based Triboelectric Energy Harvesters
Rayyan Ali Shaukat, Jihun Choi, Chang Kyu Jeong
J Powder Mater. 2023;30(6):528-535.   Published online December 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.6.528
  • 627 View
  • 24 Download
  • 2 Citations
AbstractAbstract PDF

Since their initial development in 2012, triboelectric nanogenerators (TENGs) have gained popularity worldwide as a desired option for harnessing energy. The urgent demand for TENGs is attributed to their novel structural design, low cost, and use of large-scale materials. The output performance of a TENG depends on the surface charge density of the friction layers. Several recycled and biowaste materials have been explored as friction layers to enhance the output performance of TENGs. Natural and oceanic biomaterials have also been investigated as alternatives for improving the performance of TENG devices. Moreover, structural innovations have been made in TENGs to develop highly efficient devices. This review summarizes the recent developments in recycling and biowaste materials for TENG devices. The potential of natural and oceanic biowaste materials is also discussed. Finally, future outlooks for the structural developments in TENG devices are presented.

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  • Fabrication and Characterization of a Flexible Polyurethane-Based Triboelectric Nanogenerator for a Harvesting Energy System
    Saba Ejaz, Imran Shah, Shahid Aziz, Gul Hassan, Ahmed Shuja, Muhammad Asif Khan, Dong-Won Jung
    Micromachines.2025; 16(2): 230.     CrossRef
  • Optimized Process and Mechanical and Electrical Analysis of Polyimide/Pb(Zr,Ti)O3-Based Flexible Piezoelectric Composites
    Junki Lee, Sang-il Yoon, Hyunseung Kim, Chang Kyu Jeong
    Journal of Powder Materials.2025; 32(1): 16.     CrossRef
Articles
Article image
[Korean]
Fabrication of Flexible Energy Harvester Based on BaTiO3 Piezoelectric Nanotube Arrays
Seo Young Yoon, Cheol Min Kim, Bitna Bae, Yujin Na, Haksu Jang, Kwi-Il Park
J Powder Mater. 2023;30(6):521-527.   Published online December 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.6.521
  • 322 View
  • 12 Download
  • 2 Citations
AbstractAbstract PDF

Piezoelectric technology, which converts mechanical energy into electrical energy, has recently attracted drawn considerable attention in the industry. Among the many kinds of piezoelectric materials, BaTiO3 nanotube arrays, which have outstanding uniformity and anisotropic orientation compared to nanowire-based arrays, can be fabricated using a simple synthesis process. In this study, we developed a flexible piezoelectric energy harvester (f-PEH) based on a composite film with PVDF-coated BaTiO3 nanotube arrays through sequential anodization and hydrothermal synthesis processes. The f-PEH fabricated using the piezoelectric composite film exhibited excellent piezoelectric performance and high flexibility compared to the previously reported BaTiO3 nanotube array-based energy harvester. These results demonstrate the possibility for widely application with high performance by our advanced f-PEH technique based on BaTiO3 nanotube arrays.

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  • Flexible Thermoelectric Energy Harvester with Stacked Structure of Thermoelectric Composite Films Made of PVDF and Bi2Te3-Based Particles
    Da Eun Shin, Nagamalleswara Rao Alluri, Kwi-Il Park
    ACS Applied Energy Materials.2024; 7(19): 8288.     CrossRef
  • CoFe2O4-BaTiO3 core-shell-embedded flexible polymer composite as an efficient magnetoelectric energy harvester
    Bitna Bae, Nagamalleswara Rao Alluri, Cheol Min Kim, Jungho Ryu, Gwang Hyeon Kim, Hyeon Jun Park, Changyeon Baek, Min-Ku Lee, Gyoung-Ja Lee, Geon-Tae Hwang, Kwi-Il Park
    Materials Today Physics.2024; 48: 101567.     CrossRef
Article image
[Korean]
Changes in Mechanical and Electrical Properties as a Function of Unidirectional Pressure Changes in Preforming While Isostatic Pressing for Graphite Block Fabrication
Tae-Sub Byun, Dong-Pyo Jeon, Sang-Hye Lee, Sang-Woo Lee, Jae-Seung Roh
J Powder Mater. 2023;30(1):35-40.   Published online February 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.1.35
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AbstractAbstract PDF

In this study, a graphite block is fabricated using artificial graphite processing byproduct and phenolic resin as raw materials. Mechanical and electrical property changes are confirmed due to the preforming method. After fabricating preforms at 50, 100, and 150 MPa, CIP molding at 150 MPa is followed by heat treatment to prepare a graphite block. 150UP-CIP shows a 12.9% reduction in porosity compared with the 150 MPa preform. As the porosity is decreased, the bulk density, flexural strength, and shore hardness are increased by 14.9%, 102.4%, and 13.7%, respectively; and the deviation of density and electrical resistivity are decreased by 51.9% and 34.1%, respectively. Therefore, as the preforming pressure increases, the porosity decreases, and the electrical and mechanical properties improve.

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  • Effect of Microstructural Change under Pressure during Isostatic Pressing on Mechanical and Electrical Properties of Isotropic Carbon Blocks
    Tae-Sub Byun, Sang-Hye Lee, Suk-Hwan Kim, Jae-Seung Roh
    Materials.2024; 17(2): 387.     CrossRef
  • Effect of Pressure and Holding Time during Compression Molding on Mechanical Properties and Microstructure of Coke-Pitch Carbon Blocks
    Sun-Ung Gwon, Sang-Hye Lee, U-Sang Youn, Jae-Seung Roh
    Applied Sciences.2024; 14(2): 772.     CrossRef
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[English]
Fabrication of Equiatomic CoCrFeMnNi High-Entropy Alloy by Metal Injection Molding Process Using Coarse-Sized Powders
Eun Seong Kim, Jae Man Park, Ji Sun Lee, Jungho Choe, Soung Yeoul Ahn, Sang Guk Jeong, Do Won Lee, Seong Jin Park, Hyoung Seop Kim
J Powder Mater. 2023;30(1):1-6.   Published online February 1, 2023
DOI: https://doi.org/10.4150/KPMI.2023.30.1.1
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AbstractAbstract PDF

High-entropy alloys (HEAs) are attracting attention because of their excellent properties and functions; however, they are relatively expensive compared with commercial alloys. Therefore, various efforts have been made to reduce the cost of raw materials. In this study, MIM is attempted using coarse equiatomic CoCrFeMnNi HEA powders. The mixing ratio (powder:binder) for HEA feedstock preparation is explored using torque rheometer. The block-shaped green parts are fabricated through a metal injection molding process using feedstock. The thermal debinding conditions are explored by thermogravimetric analysis, and solvent and thermal debinding are performed. It is densified under various sintering conditions considering the melting point of the HEA. The final product, which contains a small amount of non-FCC phase, is manufactured at a sintering temperature of 1250°C.

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  • Development of 3D interconnected nanoporous TiZrHfNbTaNi high-entropy alloy via liquid metal dealloying and subsequent synthesis of (TiZrHfNbTaNi)O high-entropy oxide
    Jae Hyuk Lee, Soo Vin Ha, Jihye Seong, Akira Takeuchi, Ruirui Song, Hidemi Kato, Soo-Hyun Joo
    Journal of Materials Research and Technology.2025; 35: 5204.     CrossRef
  • Characterization of the Manufacturing Process and Mechanical Properties of CoCrFeMnNi High-Entropy Alloys via Metal Injection Molding and Hot Isostatic Pressing
    Eun Seong Kim, Jae Man Park, Do Won Lee, Hyojeong Ha, Jungho Choe, Jaemin Wang, Seong Jin Park, Byeong-Joo Lee, Hyoung Seop Kim
    journal of Korean Powder Metallurgy Institute.2024; 31(3): 243.     CrossRef

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