一种新的MoSi_2基复合材料显微结构及其对力学性能的影响

A Novel Microstructure and Its Effects on Mechanical Properties of TiC/TiB_2/MoSi_2 Composites

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．

A novel microstructure of TiC /TiB_2 / MoSi_2 composite and its effect on mechanicalproperties were studied. The results indicate that hollow particles, consisting of TiC and TiB_2nanosized grains, can be formed in MoSi_2 matrix when the mixed powder of elemental Ti, B4_Cand MoSi_2 was reactively hot pressed. The bending strength of these composites with the newmicrostructure reaches at 480 MPa, and the highest fracture toughness is 5.2 Mpa.m^l/2.