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本文研究了原位生成的TiC/TiB2/MoSi2三相复合材料的一种新的显微结构及其对力学性能的影响,结果表明,当热压金属Ti,B4C和MoSi2的混合粉末时,在MoSi2的基体内生成由TiC和TiB2组成的空心粒子.其中的TiC和TiB2粒子均为纳米粒子.具有此新显微结构的复合材料,强度达到480MPa,断裂韧性为5.2MPa·m1/2,较单相MoSi2材料的力学性能有大幅度提高.
In this paper, a new microstructure of TiC / TiB2 / MoSi2 composites and its effect on the mechanical properties of TiC / TiB2 / MoSi2 composites were investigated. The results show that when the mixed powders of Ti, B4C and MoSi2 are hot pressed Hollow particles composed of TiC and TiB2 are formed in the matrix of MoSi2. One of the TiC and TiB2 particles are nanoparticles. The composite material with the new microstructure has a strength of 480MPa and a fracture toughness of 5.2MPa · m1 / 2, which is significantly improved compared with the single-phase MoSi2 material.