In this study, lanthanum oxide (La₂O₃) dispersed molybdenum (Mo–La₂O₃) alloys are fabricated using lanthanum nitrate solution and nanosized Mo particles produced by hydrogen reduction of molybdenum oxide. The effect of La₂O₃ dispersion in a Mo matrix on the fracture toughness at room temperature is demonstrated through the formation behavior of La₂O₃ from the precursor and three-point bending test using a single-edge notched bend specimen. The relative density of the Mo–0.3La₂O₃ specimen sintered by pressureless sintering is approximately 99%, and La₂O₃ with a size of hundreds of nanometers is uniformly distributed in the Mo matrix. It is also confirmed that the fracture toughness is 19.46 MPa·m^1/2, an improvement of approximately 40% over the fracture toughness of 13.50 MPa·m^1/2 on a pure-Mo specimen without La₂O₃, and this difference in the fracture toughness occurs because of the changes in fracture mode of the Mo matrix caused by the dispersion of La₂O₃.

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• Sintering property of micro/nano core-shell molybdenum powder synthesized by mechanochemical process
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  International Journal of Refractory Metals and Hard Materials.2024; 119: 106532.     CrossRef
• Novel design of Mo-Si-B + La2O3 powder with multi-shell structure for ideal microstructure and enhanced mechanical property
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  International Journal of Refractory Metals and Hard Materials.2024; 120: 106611.     CrossRef

Over the last decade, the next generation’s ultra-high-temperature materials as an alternative to Nickel-based superalloys have been highlighted. Ultra-high-temperature materials based on refractory metals are one of several potential candidates. In particular, molybdenum alloys with small amounts of silicon and boron (Mo-Si-B alloys) have superior properties at high temperature. However, research related to Mo-Si-B alloys were mainly conducted by several developed countries but garnered little interest in Korea. Therefore, in this review paper, we introduce the development history of Mo-Si-B alloys briefly and discuss the properties, particularly the mechanical and oxidation properties of Mo-Si-B alloys. We also introduce the latest research trends of Mo-Si-B alloys based on the research paper. Finally, for domestic research related to this field, we explain why Mo-Si-B alloys should be developed and suggest the potential directions for Mo-Si-B alloys research.

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  journal of Korean Powder Metallurgy Institute.2023; 30(6): 478.     CrossRef
• Preparation and Structure of Chromium Coatings Doped with Diamond Nanoparticles Deposited Directly on a Monolithic Composite of Molybdenum and Aluminum
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  Protection of Metals and Physical Chemistry of Surfaces.2023; 59(3): 396.     CrossRef
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  Liang Jiang, Bin Zheng, Changsong Wu, Pengxiang Li, Tong Xue, Jiandong Wu, Fenglan Han, Yuhong Chen
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• Heat-Resistant Molybdenum Borosilicate Alloys Hardened with Titanium Carbides: Mo–Si–B–TiC (Survey)
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