自蔓延原位合成TiC/MoSi2复合材料及其力学性能
Mechanical Properties of TiC/MoSi2 Composites Prepared by Self-propagating In-situ Synthesis
摘 要
以钼、硅、钛和碳粉为原料,采用自蔓延原位合成技术制备了不同体积分数TiC强韧化的MoSi2基复合材料,研究了TiC颗粒对MoSi2基体材料显微组织和力学性能的影响.结果表明:TiC颗粒均匀分布于MoSi2基体中;TiC体积分数为30%时,TiC/MoSi2复合材料硬度、抗弯强度和断裂韧度分别达到15.02 GPa、366 MPa和6.26 MPa·m1/2,比纯MoSi2分别增加61.5%、26.8%和150%;复合材料的断口表现为沿晶断裂和准解理断裂的混合形式,其强化机制是细晶强化和弥散强化,韧化机制为细晶韧化.
自蔓延
TiC/MoSi2复合材料
in-situ synthesis
self-propagating
TiC/MoSi2 composite
Abstract
TiC/MoSi2 composites with different volume fraction of TiC particles were fabricated by self-propagating high temperature synthesis (SHS) with Mo,Si,Ti and C powders as raw materials.Effects of TiC particles on microstructure and mechanical properties of MoSi2 matrix were investigated.The results indicated that TiC particles were uniformly distributed in MoSi2 matrix.The hardness,flexure strength and fracture toughness of 30% TiC/MoSi2 composite reached 15.02 GPa,366 MPa and 6.26 MPa·m1/2 and increased 61.5%,26.8% and 150% respectively compared with monolithic MoSi2.The fracture characteristic of the composites is cleavage and intergranular.The strengthening mechanisms of the composites are grain refinement and dispersion strengthening,while the toughening mechanism is grain refinement toughening.
中图分类号 TF123.11
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(50405041);湖南教育厅资助项目(06C316)
收稿日期 2007/10/14
修改稿日期 2008/1/30
网络出版日期
作者单位点击查看
备注颜建辉(1973-),男,江西莲花人,讲师,博士.
引用该论文: YAN Jian-hui,YANG Yan,ZHANG Hou-an. Mechanical Properties of TiC/MoSi2 Composites Prepared by Self-propagating In-situ Synthesis[J]. Materials for mechancial engineering, 2008, 32(10): 10～13
颜建辉,杨艳,张厚安. 自蔓延原位合成TiC/MoSi2复合材料及其力学性能[J]. 机械工程材料, 2008, 32(10): 10～13
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参考文献
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【4】Mihell T E,Misra A.Structure and mechanical properties of (Mo,Re)Si2 alloys[J].Mater Sci Eng,1999,A261:106-112.
【5】黎文献,徐广卓,唐嵘,等.钴对MoSi2组织和性能的影响[J].稀有金属材料与工程,1998,27(4):222-225.
【6】Manomaisupat D,Wilknson D S,Petric A.Combustion synthesis and mechanical properties of molybdenum disilicide com-posite reinforcement with sic particulate[J].Journal of Materials Science,1998,33:2319-2330.
【7】Zakeri M,Yazdani-Rad R,Enayati M H,et al.Synthesis of MoSi2-Al2O3 nanocomposite by mechanical alloying[J].Mater Sci Eng,2006,A430:185-188.
【8】Singh,Godkhindi M M,Krishnarao R V,et al.Synthesis of Si3N4-MoSi2 in situ composite from mechanically activated (Mo+Si3N4) powders[J].Journal of Alloys and Compounds,2004,381:254-257.
【9】Zeng Y P,Chao N X,Watanabe T.The effects of carbon addition on the mechanical properties of MoSi2-TiC composites[J].Ceramics International,2002,28:387-392.
【10】Sun L,Pan J S.TiC whisker-reinforced MoSi2 matrix composite[J].Materials Letters,2001,51:270-274.
【11】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.
【12】孟军虎,吕晋军,王静波,等.MoSi2基复合材料的摩擦学行为[J].稀有金属材料与工程,2005,34:326-328.
【13】Zhu Q,Shobu K,Zeng Y.Oxidation behavior of hot-pressed Mosi2-TiC composite[J].Journal of Materials Science,2001,36:313-319.
【14】李建林,江东亮,谭寿洪.一种新的MoSi2基复合材料显微结构及其对力学性能的影响[J].无机材料学报,2000,15(1):74-78.
【15】李建林,江东亮,谭寿洪.高强空心粒子增韧增强陶瓷材料[J].硅酸盐学报,1999,27(5):631-636.
【16】郜剑英,江莞,王刚.自蔓延高温合成MoSi2[J].材料科学与工艺,2005,13(6):669-672.
【17】Anstis G R,Chantikul P,Lawn B R,et al.A Critical evaluation of indentation techniques for measuring fracture toughness:Ⅰ,Direct crack measurements[J].Journal of the American Ceramics Society,1981,64(9):533-538.
【18】殷声.自蔓延高温合成技术[M].北京:冶金工业出版社,1999:76-78.
【19】Subrahmanyam J,Mohan R R.Combustion synthesis of MoSi2-TiC composites[J].Mater Res,1995,10(5):1226-1234.
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