原位SiC颗粒对SiCP/MoSi2室温断裂韧度的影响
Effect of In-situ SiC Particle on Room-temperature Fracture Toughness of SiCP/MoSi2
摘 要
以钼、硅 、碳粉末为原料,采用湿法混合和原位反应热压一次复合工艺制备了MoSi2以及含不同体积分数原位SiC颗粒的SiCP/MoSi2复合材料,并研究了原位SiC颗粒对该材料室温断裂韧度的影响.结果表明：复合后的SiCP/MoSi2室温断裂韧度大幅度提高,原位SiC颗粒可以细化MoSi2基体晶粒,减少和消除脆性的SiO2玻璃相,并阻碍SiCP/MoSi2 复合材料断裂时的裂纹扩展而造成裂纹的偏转和桥接.
SiCP/MoSi2复合材料
室温断裂韧度
in-situ SiC particle
SiCP/MoSi2 composite
room-temperature fracture toughness
Abstract
MoSi2 and SiCP/MoSi2 composites reinforced with different volume fractions of in-situ SiC particles were fabricated by means of in-situ reaction and hot press synthesis after wet mixing pure powders of Mo,Si and C.The effects of in-situ SiC particles on room-temperature fracture toughness of the composites were investigated.The room-temperature fracture toughness of the SiCP/MoSi2 composite increases,and the in-situ SiC particles refine the MoSi2 grains and eliminates the brittle SiO2 glass,resulting in crack deflection and bridging during the crack extension.
中图分类号 TQ174
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收稿日期 2006/9/29
修改稿日期 2007/3/30
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备注王含英(1972-),女,河南郑州人,讲师,硕士.
引用该论文: WANG Han-ying,YANG Yan-qing,HANG Rui-qiang,WU Zhong,CHEN Yan. Effect of In-situ SiC Particle on Room-temperature Fracture Toughness of SiCP/MoSi2[J]. Materials for mechancial engineering, 2007, 31(8): 42～44
王含英,杨延清,杭瑞强,吴中,陈彦. 原位SiC颗粒对SiCP/MoSi2室温断裂韧度的影响[J]. 机械工程材料, 2007, 31(8): 42～44
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参考文献
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【2】Lu T C,Evan A G.Matrix cracking in intermetallic composites caused by thermal expansion mismatch[J].Acta Metal Mater,1991,39(8):1883-1890.
【3】Petrovic J J.ZrO2 reinforced MoSi2 matrix composites[J].Ceram Eng Sci Proc,1991,12(9/10):1633-1636.
【4】孙岚,潘金生.TiC颗粒增韧MoSi2基复合材料的力学性能[J].材料工程,2001(9):31-34.
【5】李爱兰,曾燮榕.Nb增韧MoSi2基复合材料的研究进展[J].材料工程,2002(2):6-9.
【6】Costa e Silva A,Kaufman M J.Applications of in situ reaction to MoSi2 based materials[J].Materials Science and Engineering A,1995,195:75-77.
【7】Kou K,Yang Y.Self-propagating high-temperature combustion synthesis of MoSi2-WSi2 composite[J].Rare Metal Mater Eng,2000,29(3):190-192.
【8】张来启,孙祖庆.原位SiC颗粒增强MoSi2基复合材料的显微组织和力学性能[J].金属学报,2001,37(3):325-331.
【9】郜剑英,江莞,李建林.二硅化钼合金化及掺杂改性的研究进展[J].中国钼业,2003(4):22-25.
【10】Aikin R M.Strengthening of discontinuously reinforced MoSi2 composites at high temperatures[J].Materials Science and Engineering A,1992,155:121-133.
【11】刘伯威,潘进,樊毅,等.SiC颗粒强韧化MoSi2复合材料[J].复合材料学报,2002,19(1):59-63.
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