摘要
利用放电等离子烧结法(SPS)制备了MoSi2-ZrO2复合材料,研究了纳米ZrO2颗粒数量对MoSi2基复合材料显微组织和力学性能的影响。结果表明,在MoSi2基体中加入纳米ZrO2颗粒,能细化基体晶粒,改善力学性能;随着ZrO2含量的增加,复合材料的抗压强度随之增加,硬度和断裂韧性先增后减;当ZrO2含量为20%时,室温抗压强度、硬度以及断裂韧度分别为1857 MPa、1235 HV0.5和6.8 MPa.m1/2,与纯MoSi2相比,分别提高102%、19.8%和116%;经500℃氧化300 h后,复合材料氧化后的质量增加量是纯MoSi2的1/10左右。
MoSi2-ZrO2 composites with different volume percent of ZrO2 were prepared by the spark plasma sintering （SPS）. The effects of nano-ZrO2 particles on the microstructure and mechanical properties of MoSi2 matrix composites were investigated. The results indicate that the grain size of MoSi2 matrix decreases and its mechanical properties are improved with the addition of ZrO2 particles. As volume percent of ZrO2 increases, the compressive strength firstly increases, hardness and fracture toughness increase at first and then decrease. When volume percent of ZrO2 is 20%, the roomtemperature compressive strength, hardness and fracture toughness, are 1857 MPa, 1235 HV0. 5 and 6. 8 MPa ·m^1/2, which,compared with pure MoSi2 ,increased by 102%, 19. 8% and 116% ,respectively. Being oxided at 500 ℃ for 300 h, the incremental weight of composite is 1/10 of pure MoSi2.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2007年第6期33-36,共4页
Heat Treatment of Metals
