SiC颗粒强韧化MoSi_2复合材料  

Si C PARTICL E REINFORCED Mo Si2 COMPOSITES

作　　者：刘伯威[1] 潘进[2] 樊毅[1] 张金生[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]广岛大学工学部机械系

出　　处：《复合材料学报》2002年第1期59-63,共5页Acta Materiae Compositae Sinica

摘　　要：通过湿法混料和热压烧结工艺成功地制备了 2 0 vo1% Si CP/ Mo Si2 复合材料 ,并测定了其显微组织和力学性能。结果表明 :Si CP/ Mo Si2 复合材料主要由 Mo Si2 和 Si C颗粒组成 ,还有少量的 Mo5Si3,致密度为 92 .3 %。与Mo Si2 相比 ,其室温抗弯强度提高了 30 .6 % ,断裂韧性提高了 5 3 % ,12 0 0℃的抗压强度提高了 44 % ,140 0℃的抗压强度提高了 5 3 % ;其硬度、弹性模量等性能有较大提高。在 Al2 O3和 Si C对磨盘上表现出极其优异的耐磨性能。Si C颗粒对 Mo Si2 的室温增韧。SiC particle reinforced molybdenum disilicide (MoSi2) matrix composite has been successfully fabricated by wet mixing and hot press sintering. The microstructure and mechanical properties of the composite were determined. Experimental results show that the SiCp/MoSi2 composite has a phase constituent with about 20 vol% SiC and less Mo5Si3 in the MoSi2 matrix. Compared with unreinforced MoSi2, the flexural strength of SiCp/MoSi2 composite is increased by 30.6% and the fracture toughness is increased by 53% at room temperature. The compressive yield strength of SiCp/MoSi2 composite is increased by 44% at 1200°C and by 53% at 1400°C. The SiCp/MoSi2 composite has been improved in its hardness and elastic modulus. Wear resistance performance of SiCp/MoSi2 by Al2O3 and SiC grind wheel is very excellent. The addition of SiC particles into the MoSi2 matrix has remarkably improved its toughness at room temperature and its strength at high temperature.

关 键 词：二硅化钼 复合材料 SIC颗粒 力学性能 MOSI2 高温结构材料 陶瓷 增韧 增强 碳化硅 

分 类 号：TQ174.758[化学工程—陶瓷工业] TB332[化学工程—硅酸盐工业]