Cobalt coated tungsten carbide-cobalt composite powder has been prepared through wet chemical reduction method. The cobalt sulfate solution was converted to the cobalt chloride then the cobalt hydroxide. The tungsten carbide powders were added in to the cobalt hydroxide, the cobalt hydroxide was reduced and coated over tungsten carbide powder using hypo-phosphorous acid. Both the cobalt and the tungsten carbide phase peaks were evident in the tungsten carbide-cobalt composite powder by X-ray diffraction. The average particle size measured via scanning electron microscope, particle size analysis was around 380 nm and the thickness of coated cobalt was determined to be 30~40 nm by transmission electron microscopy.

Citations

Citations to this article as recorded by  

• Pre-treatments of initial materials for controlling synthesized TaC characteristics in the SHS process
  Jae Jin Sim, Sang Hoon Choi, Ji Hwan Park, Il Kyu Park, Jae Hong Lim, Kyoung Tae Park
  journal of Korean Powder Metallurgy Institute.2018; 25(3): 251.     CrossRef
• Spark plasma sintering of WC–Co tool materials prepared with emphasis on WC core–Co shell structure development
  Sungkyu Lee, Hyun Seon Hong, Hyo-Seob Kim, Soon-Jik Hong, Jin-Ho Yoon
  International Journal of Refractory Metals and Hard Materials.2015; 53: 41.     CrossRef

The 304 stainless steel powders were prepared by high energy ball milling and subsequently sintered by spark plasma sintering, and the microstructural characteristics and micro-hardness were investigated. The initial size of the irregular shaped 304 stainless steel powders was approximately 42 μm. After high energy ball milling at 800 rpm for 5h, the powders became spherical with a size of approximately 2 μm, and without formation of reaction compounds. From TEM analysis, it was confirmed that the as-milled powders consisted of the aggregates of the nano-sized particles. As the sintering temperature increased from 1073K to 1573K, the relative density and micro-hardness of sintered sample increased. The sample sintered at 1573K showed the highest relative density of approximately 95% and a micro-hardness of 550 Hv.

Citations

Citations to this article as recorded by  

• Investigating molybdenum’s sulphur scavenging ability for MoS2 formation in preventing pitting corrosion of stainless steels
  Kai Xiang Kuah, Daniel J. Blackwood
  npj Materials Degradation.2023;[Epub]     CrossRef

A high temperature dilatometer attached to a graphite furnace is built and used to study the sintering behavior of B₄C. Pristine and carbon doped B₄C compacts are sintered at various soaking temperatures and their shrinkage profiles are detected simultaneously using the dilatometer. Carbon additions enhance the sinterability of B₄C with sintering to more than 97% of the theoretical density, while pristine B₄C compacts could not be sintered above 91% due to particle coarsening. The shrinkage profiles of B₄C reveal that the effect of carbon on the sinterability of B₄C can be seen mostly below 1950°C. The high temperature dilatometer delivers very useful information which is impossible to obtain with conventional furnaces.

Citations

Citations to this article as recorded by  

• Application of rate-controlled sintering into the study of sintering behavior of boron carbide
  Hyukjae Lee
  Journal of the Korean Crystal Growth and Crystal Technology.2015; 25(1): 6.     CrossRef

Flake-like LiCoO₂ nanopowders were fabricated using electrospinning. To investigate their formation mechanism, field-emssion scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were carried out. Among various parameters of electrospinning, we controlled the molar concentration of the precursor and the PVP polymer. When the molar concentration of lithium and cobalt was 0.45 M, the morphology of LiCoO₂ nanopowders was irregular and round. For 1.27 M molar concentration, the LiCoO₂ nanopowders formed with flake-like morphology. For the PVP polymer, the molar concentration was set to 0.011 mM, 0.026 mM, and 0.043 mM. Irregular LiCoO₂ nanopowders were formed at low concentration (0.011 mM), while flake-like LiCoO₂ were formed at high concentration (0.026 mM and 0.043 mM). Thus, optimized molar concentration of the precursor and the PVP polymer may be related to the successful formation of flake-like LiCoO₂ nanopowders. As a results, the synthesized LiCoO₂ nanopowder can be used as the electrode material of Li-ion batteries.

Citations

Citations to this article as recorded by  

• Electrochemical Behavior of Well-dispersed Catalysts on Ruthenium Oxide Nanofiber Supports
  Geon-Hyoung An, Hyo-Jin Ahn
  Journal of Korean Powder Metallurgy Institute.2017; 24(2): 96.     CrossRef
• Synthesis and Characterization of SnO2-CoO/carbon-coated CoO Core/shell Nanowire Composites
  Yu-Jin Lee, Bon-Ryul Koo, Hyo-Jin Ahn
  Journal of Korean Powder Metallurgy Institute.2014; 21(5): 360.     CrossRef

In this study, an aluminum oxide layer for sealing treatment of nano-diamond powder was synthesized by anodizing under constant current. The produced pore size and oxide thickness were investigated using scanning electron microscopy. The pore size increased as the treatment time increased, current density increased, sulfuric acid concentration decreased, which is different from the results under constant voltage, due to a dissolution of the oxide layers. The oxide layer thickness by the anodizing increased as temperature, time, and current density increased. The results of this study can be applied to optimize the sealing treatment process of nano-diamond particles of 4-10 nm to enhance the resistances of corrosion and wear of the matrix.

Citations

Citations to this article as recorded by  

• Convergent Study of Aluminum Anodizing Method on the Thermal Fatigue
  Soo Young Kang
  Journal of the Korea Convergence Society.2016; 7(5): 169.     CrossRef
• Convergent Study of Texture on the Mechanical Properties of Electrodeposits
  Soo Young Kang
  Journal of the Korea Convergence Society.2016; 7(6): 193.     CrossRef
• Study on Improvement of Corrosion Resistance and Wear Resistance by Anodizing and Sealing Treatment with Nano-diamond Powder on aluminum
  Soo Young Kang, Dae Won Lee
  Journal of the Korean institute of surface engineering.2014; 47(3): 121.     CrossRef
• Study on Hardness and Corrosion Resistance of Magnesium by Anodizing and Sealing Treatment With Nano-diamond Powder
  Soo Young Kang, Dae Won Lee
  Journal of Korean Powder Metallurgy Institute.2014; 21(4): 260.     CrossRef

Pt has been widely used as catalyst for fuel cell and exhausted gas clean systems due to its high catalytic activity. Recently, there have been researches on fabricating composite materials of Pt as a method of reducing the amount of Pt due to its high price. One of the approaches for saving Pt used as catalyst is a core shell structure consisting of Pt layer on the core of the non-noble metal. In this study, the synthesis of Pt shell was conducted on the surface of TiO₂ particle, a non-noble material, by applying ultraviolet (UV) irradiation. Anatase TiO₂ particles with the average size of 20~30 nm were immersed in the ethanol dissolved with Pt precursor of H₂PtCl₆∙6H₂O and exposed to UV irradiation with the wavelength of 365 nm. It was confirmed that Pt nano-particles were formed on the surface of TiO₂ particles by photochemical reduction of Pt ion from the solution. The morphology of the synthesized Pt@TiO₂ nano-composite was examined by TEM (Transmission Electron Microscopy).

Citations

Citations to this article as recorded by  

• Photocatalytic activity of rutile TiO2 powders coupled with anatase TiO2 nanoparticles using surfactant
  Jong Min Byun, Chun Woong Park, Young In Kim, Young Do Kim
  journal of Korean Powder Metallurgy Institute.2018; 25(3): 257.     CrossRef
• Synthesis and Photo Catalytic Activity of 10 wt%, 20 wt%Li-TiO2 Composite Powders
  Hyeong-Chul Kim, Jae-Kil Han
  Journal of Korean Powder Metallurgy Institute.2016; 23(1): 33.     CrossRef

The automotive industry is moving from the internal combustion engine to electric drive motors. Electric motors uses a high voltage system requiring the development of resources and components to shield the system. Therefore, in this study, we analyze electromagnetic interference (EMI) shielding effectiveness (SE) characteristics of an auto crash pad according to the ratio of electrically conductive materials and propylene. In order to combine good mechanical characteristics and electromagnetic shielding of the automotive crash pad, metal-coated glass fiber (MGF) manufacturing methods are introduced and compared with powder-type methods. Through this study, among MGF methods, we suggest that the chopping method is the most effective shielding method.

Cathode materials and their precursors are prepared with transition metal solutions recycled from the the waste lithium-ion batteries containing NCM (nickel-cobalt-manganese) cathodes by a H₂ and C-reduction process. The recycled transition metal sulfate solutions are used in a co-precipitation process in a CSTR reactor to obtain the transition metal hydroxide. The NCM cathode materials (Ni:Mn:Co=5:3:2) are prepared from the transition metal hydroxide by calcining with lithium carbonate. X-ray diffraction and scanning electron microscopy analyses show that the cathode material has a layered structure and particle size of about 10 μm. The cathode materials also exhibited a capacity of about 160 mAh/g with a retention rate of 93~96% after 100 cycles.

In this study, we report the sintering behavior and properties of a Ge₂Sb₂Te₅ alloy powders for use as a sputtering target by spark plasma sintering. The effect of various sintering parameters, such as pressure, temperature and time, on the density and hardness of the target has been investigated in detail. Structural characterization was performed by scanning electron microscopy and X-ray diffraction. Hardness and thermal properties were measured by differential scanning calorimetry and micro-vickers hardness tester. The density and hardness of the sintered Ge₂Sb₂Te₅ materials were 5.8976~6.3687 g/cm³ and 32~75 Hv, respectively.

Fundamental experiences have been studied for development of pre-treatment process of Sn by-products such as solders. Dry and wet separation/recovery processes were considered by the differences of physical properties. The by-products, which are analyzed by solder metal and oxides. The metal and oxide were simply separated by dry ball-milling process for 12 hours, after that recovery metal powder might be reusable as lead or lead-free solders. In terms of wet separation process, samples were dissolved in HNO₃ + H₂O₂ and the precipitation were analyzed by SnO₂. Overall efficiency of recovery might be increasing via developing simple pre-treatment process.

Citations

Citations to this article as recorded by  

• Material Flow Analysis for Stable Supply and Demand Management of Tin
  Sang Hyun Oh, Hong-Yoon Kang, Yong Woo Hwang, Doo Hwan Kim, Kayoung Shin, Nam Seok Kim
  Resources Recycling.2023; 32(4): 18.     CrossRef
• The Current Status and Securing Strategies of tin Resources for Future Core Industries
  Hoseok Jeon, Dohyun Jeong, Yeoni Chu, Seongmin Kim
  Journal of the Korean Society of Mineral and Energy Resources Engineers.2022; 59(4): 408.     CrossRef

Citations

Citations to this article as recorded by  

• Particle interactions during dry powder mixing and their effect on solvent-free manufactured electrode properties
  Zhongjia Gao, Jinzhao Fu, Chinmoy Podder, Xiangtao Gong, Yan Wang, Heng Pan
  Journal of Energy Storage.2024; 83: 110605.     CrossRef
• Controlling Particle Size of Recycled Copper Oxide Powder for Copper Thermite Welding Characteristics
  Hansung Lee, Minsu Kim, Byungmin Ahn
  journal of Korean Powder Metallurgy Institute.2023; 30(4): 332.     CrossRef
• Influence of Mixing Process on the Performance of Electrodes Made by a Dry Coating Method
  Ming Wang, Kubra Uzun, Bradley R. Frieberg, Jiazhi Hu, Anita Li, Xiaosong Huang, Yang-Tse Cheng
  Journal of The Electrochemical Society.2023; 170(1): 010541.     CrossRef
• Influence of ball materials on the surface activation behavior of coal ash particles during a mechanochemical process
  Takumi Sangu, Yunzi Xin, Takashi Hitomi, Kunihiko Kato, Takashi Shirai
  Ceramics International.2023; 49(21): 34327.     CrossRef
• Mechanosynthesizing a dual cation orthophosphate using planetary ball mill; Potassium struvite production employing different primary components
  Alimohammad Dehghan Manshady, Gholamreza Rakhshandehroo, Nasser Talebbeydokhti
  Advanced Powder Technology.2022; 33(10): 103751.     CrossRef
• Comparison study of physicochemical and biopharmaceutics properties of hydrophobic drugs ground by two dry milling processes
  M. Dandignac, S. P. Lacerda, A. Chamayou, L. Galet
  Pharmaceutical Development and Technology.2022; 27(7): 816.     CrossRef
• Effects of two-step high-energy ball milling process and hot isostatic pressing on the mechanical properties of PM magnesium
  Jesus María Rios, Alex Humberto Restrepo, Alejandro Alberto Zuleta, Francisco Javier Bolívar, Juan Guillermo Castaño, Esteban Correa, Félix Echeverria
  The International Journal of Advanced Manufacturing Technology.2022; 121(1-2): 187.     CrossRef
• A chemical milling process to produce water-based inkjet printing ink from waste tire carbon blacks
  I-Feng Wu, Ying-Chih Liao
  Waste Management.2021; 122: 64.     CrossRef
• Microstructural Design of Ba0.5La0.5Co0.5Fe0.5O3 Perovskite Ceramics
  Daria Gierszewska, Iga Szpunar, Francis Oseko, Joanna Pośpiech, Małgorzata Nadolska, Martyna Pieragowska, Karolina Reniecka, Kinga Waniek, Karol Leszczyński, Aleksandra Mielewczyk-Gryń, Maria Gazda, Sebastian Wachowski
  Materials.2021; 14(16): 4656.     CrossRef
• Mechanical high-energy treatment of TiNi powder and phase changes after electrochemical hydrogenation
  E.V. Abdulmenova, S.N. Kulkov
  International Journal of Hydrogen Energy.2021; 46(1): 823.     CrossRef
• Rejuvenation of granulated blast furnace slag (GBS) glass by ball milling
  N. Romero Sarcos, D. Hart, H. Bornhöft, A. Ehrenberg, J. Deubener
  Journal of Non-Crystalline Solids.2021; 556: 120557.     CrossRef
• Key Factors During the Milling Stage of the Seed‐assisted and Solvent‐free Synthesis of MFI and Catalytic Behavior in the Alkylation of Phenol with Tert‐butyl Alcohol
  Julieth Tatiana García‐Sánchez, Iván Darío Mora‐Vergara, Daniel Ricardo Molina‐Velasco, José Antonio Henao‐Martínez, Víctor Gabriel Baldovino‐Medrano
  ChemCatChem.2021; 13(16): 3713.     CrossRef
• Nanocellulose acetate membranes: Preparation and application
  Ahmed S. Al-Rawi, Ismail K. Ibrahim Al-Khateeb, Tahseen A. Zaidan
  Environmental Nanotechnology, Monitoring & Management.2021; 16: 100529.     CrossRef
• Mechanochemical tuning of molecular weight distribution of styrene homopolymers as postpolymerization modification in solvent‐free solid‐state
  Milton Jimenez‐Francisco, Jose Gonzalo Carrillo, Luis Alfonso Garcia‐Cerda
  Journal of Applied Polymer Science.2021;[Epub]     CrossRef
• From Machining Chips to Raw Material for Powder Metallurgy—A Review
  Catarina Duarte Batista, Adriana André Martins das Neves de Pinho Fernandes, Maria Teresa Freire Vieira, Omid Emadinia
  Materials.2021; 14(18): 5432.     CrossRef
• Optimization of Milling Procedures for Synthesizing Nano-CaCO3 from Achatina fulica Shell through Mechanochemical Techniques
  O. J. Gbadeyan, S. Adali, G. Bright, B. Sithole, S. Onwubu
  Journal of Nanomaterials.2020; 2020: 1.     CrossRef
• High yield solvent extraction of hydrothermal and ball-milling treated lignin prior to enzymatic hydrolysis for co-valorization of lignin and cellulose in Miscanthus sacchariflorus
  Soo-Kyeong Jang, Jae Hoon Lee, Chan-Duck Jung, Ju-Hyun Yu, Joon Weon Choi, In-Gyu Choi, Hoyong Kim
  Fuel.2020; 269: 117428.     CrossRef
• Obtaining of tungsten nanopowders by high energy ball milling
  A V Ozolin, E G Sokolov, D A Golius
  IOP Conference Series: Materials Science and Engineering.2020; 862(2): 022057.     CrossRef
• Improvement Parameters of Hydrogen Generation from Water under Stainless-Steel-Mediated Ball Milling Conditions
  Miki Itoh, Yoshinari Sawama, Miki Niikawa, Kazuho Ban, Takahiro Kawajiri, Hironao Sajiki
  Bulletin of the Chemical Society of Japan.2020; 93(11): 1366.     CrossRef
• Overcoming the Solubility Barrier of Ibuprofen by the Rational Process Design of a Nanocrystal Formulation
  Andreas Ouranidis, Nikos Gkampelis, Elisavet Vardaka, Anna Karagianni, Dimitrios Tsiptsios, Ioannis Nikolakakis, Kyriakos Kachrimanis
  Pharmaceutics.2020; 12(10): 969.     CrossRef
• A novel approach to synthesize nitrogen-doped graphene in aspects of milling energy
  Rachit Ranjan, Ravi Shankar Rai, Vivek Bajpai
  Diamond and Related Materials.2020; 110: 108116.     CrossRef
• The influence of the rotation frequency of a planetary ball mill on the limiting value of the specific surface area of the WC and Co nanopowders
  Maksim Dvornik, Elena Mikhailenko
  Advanced Powder Technology.2020; 31(9): 3937.     CrossRef
• Kalsiyum oksit varlığında teknik hegzaklorosiklohegzan’nın mekanokimyasal parçalanması
  Volkan Pelitli, Uğur Kurt, Oltan Canlı
  Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi.2018;[Epub]     CrossRef
• Parametric study on the production of the GAGG:Ce and LSO:Ce multicomponent oxide scintillator materials through use of a planetary ball mill
  Kaitlyn A. McDonald, Matthew R. McDonald, Melissa N. Bailey, George K. Schweitzer
  Dalton Transactions.2018; 47(37): 13190.     CrossRef
• Effect of Mechanical Activation on the In Situ Formation of TiB2 Particulates in the Powder Mixture of TiH2 and FeB
  X.-K. Huynh, B.-W. Kim, J.S. Kim
  Archives of Metallurgy and Materials.2017; 62(2): 1393.     CrossRef
• Effects of mechanical milling on the carbothermal reduction of oxide of WC/Co hardmetal scrap
  Gil-Geun Lee, Gook-Hyun Ha
  Metals and Materials International.2016; 22(2): 260.     CrossRef