Abstract：In order to meet the application needs of a new generation thermal structure materials of high temperature resistance, anti-radiation, oxidation resistance, and high strength and toughness, Mo-based composites with different ZrC-AlN contents were prepared by three-dimensional dry ball milling, cold isostatic pressing, and high-temperature argon atmosphere sintering. The influences of ceramic content on the dispersion of composite powders, as well as the microstructures, oxidation behavior, and properties of composites, were studied using scanning electron microscope, X-ray diffractometer, and simultaneous thermal analyzer. The results indicate that uniformly dispersed metal ceramic composite powders can be obtained through three-dimensional dry ball milling. After oxidation from room temperature to 1 200 ℃, the mass loss rate of the composites decreases greatly with the increase of ceramic phase content, indicating the improved oxidation resistance of composites by introducing antioxidant ceramic phases. When introducing ceramic phase, the compressive strength of the composites increase greatly with the maximum of 1 315.8 MPa, increasing by about one time compared to pure Mo, it’s because the ceramic phases with high hardness, high modulus, and low compressibility which enhance the compressive property of the composites. However, the bending strength of composites decrease, which is a comprehensive result of closed pores, interface reactions, and the mechanical properties of each phase itself.
[1] 封范. 碳化物对Mo的力学行为和高温抗氧化行为的影响[D].长沙: 中南大学, 2012. FENG Fan.Mechanical behavior and high temperature oxidation behavior of carbide particle reinforced Mo alloy[D].Changsha: Central South University, 2012. [2] JING K, LIU R, XIE Z M, et al.Excellent high-temperature strength and ductility of the ZrC nanoparticles dispersed molybdenum[J].Acta Materialia, 2022, 227: 117725. [3] CHENG P M, ZHANG G J, ZHANG J Y, et al.Coupling effect of intergranular and intragranular particles on ductile fracture of Mo-La2O3 alloys[J].Materials Science and Engineering A, 2015, 640: 320-329. [4] GAN J N, GONG Q M, JIANG Y Q, et al.Microstructure and high-temperature mechanical properties of second-phase enhanced Mo-La2O3-ZrC alloys post-treated by cross rolling[J].Journal of Alloys and Compounds, 2019, 796: 167-175. [5] 胡雯. AlN颗粒增强钼基复合材料的制备及其结构与性能的研究[D].武汉: 武汉理工大学, 2015. HU Wen.Preparation of AlN/Mo composites and study of its structure and properties[D].Wuhan: Wuhan University of Technology, 2015. [6] WANG L, SUN J, LIU G, et al.Influences of annealing temperature on microstructure and mechanical properties of Mo-La2O3[J].International Journal of Refractory Metals and Hard Materials, 2011, 29(4): 522-527. [7] COCKERAM B V, BYUN T S, LEONARD K J, et al.Post-irradiation fracture toughness of unalloyed molybdenum, ODS molybdenum, and TZM molybdenum following irradiation at 244 ℃ to 507 ℃[J].Journal of Nuclear Materials, 2013, 440: 382-413. [8] HU W Q, SUN T, LIU C X, et al.Refined microstructure and enhanced mechanical properties in Mo-Y2O3 alloys prepared by freeze-drying method and subsequent low temperature sintering[J].Journal of Materials Science & Technology, 2021, 88: 36-44. [9] YAO L Y, WEI S Z, ZHOU Y C, et al.Preparation and characterization of Mo/ZrO2-Y2O3 composites[J].International Journal of Refractory Metals and Hard Materials, 2018, 75: 202-210. [10] HU W Q, DU Z F, DONG Z Z, et al.The synthesis of TiC dispersed strengthened Mo alloy by freeze-drying technology and subsequent low temperature sintering[J].Scripta Materialia, 2021, 198: 113831. [11] WANG Y, WANG D Z, LIU H Y, et al.Preparation and characterization of sintered molybdenum doped with MoSi2/La2O3/Y2O3 composite particle[J].Materials Science and Engineering A, 2012, 558: 497-501. [12] 熊刚, 成会朝, 范景莲, 等. Ti含量对Mo-10W-TiC 合金组织与性能的影响[J].粉末冶金材料科学与工程, 2018, 23(5): 454-459. XIONG Gang, CHENG Huichao, FAN Jinglian, et al.Effects of TiC content on property and microstructure of Mo-10W-TiC alloy[J].Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 454-459.
2025, Vol. 30 
