β-Si_3N_4增强MoSi_2基复合材料的组织与性能  

Microstructures and Mechanical Properties of β-Si_3N_4 Reinforced MoSi_2 Composites

作　　者：吴海飞[1] 费有静[2] 朱钢 张学彬[2] 徐金富[1] 

机构地区：[1]华东理工大学材料科学与工程学院,上海200237 [2]中国矿业大学材料科学与工程学院,江苏徐州221008 [3]宁波万宝隆机械有限公司,浙江宁波315191

出　　处：《热处理技术与装备》2007年第4期24-27,共4页Heat Treatment Technology and Equipment

摘　　要：利用放电等离子烧结法(SPS)制备了不同体积分数β-Si3N4增韧的MoSi2复合材料,研究了β-Si3N4颗粒对MoSi2基复合材料显微组织和力学性能的影响,初步探讨了β-Si3N4颗粒对MoSi2增韧的机理。结果表明:在MoSi2基体中加入β-Si3N4颗粒,能细化基体组织,改善力学性能;随着β-Si3N4体积分数的增加,复合材料的显微硬度和断裂韧性先增后减,20%β-Si3N4/MoSi2复合材料的显微硬度与断裂韧性分别比MoSi2提高了31.7%与62.9%,增韧补强效果显著;β-Si3N4的强韧化机理为细晶强化。MoSi2 matrix composites with different content of β-Si3N4 were prepared by the spark plasma sintering （SPS） technique, the influence of β-Si3N4 on the microstructure and mechanical properties of MoSi2 matrix composites were systematically studied, and toughening mechanism of MoSi2 matrix composites by β-Si3 N4 was investigated also. The results indicate that the grain size of MoSi2 matrix decreases and its mechanical properties are improved because of the addition of β-Si3N4 particles; With the increase of β- Si3 N4, the hardness and fracture toughness of β-Si3 N4/MoSi2 composites increase first and decrease later; the mechanical property is notable when the volume fraction of β-Si3N4 is 20%.

关 键 词：MOSI2基复合材料 SPS烧结 Β-SI3N4 

分 类 号：TB332[一般工业技术—材料科学与工程]