摘要
在合成SiC／FexSiy复合粉体的基础上，利用高温渗硅反应烧结制备工艺制得了SiC／FexSiy复合材料。研究了合成复合材料的关键工艺参数，确定最佳合成工艺参数为：炭黑配量5％，反应温度1550℃，恒温时间2h．FexSiy含量为5％的复合粉体。复合材料的最大常温抗折强度约为130MPa，且随烧结温度和材料中FexSiy相含量的变化而改变。SiC／FexSiy复合材料的抗折强度先随温度的升高而增加，直至转折温度Tm（90℃），然后随温度的升高而下降。材料的热导率随温度的升高而降低，在20～25℃下降迅速，之后下降幅度减缓。SiC／FexSiy复合材料的线膨胀系数随温度的升高而增加，800℃以后线膨胀系数变化幅度增大。
After high temperature. The synthesizing SiC/FexSty powders, composites were prepared by siliconizing reaction sinlered at key technological parameters were researched. The optimal technological parameters were carbon black 5%, reaction temperature 1550℃, holding time 2h and FexSiy content 5%. The maximum rupture of cornposites is about 130MPa and varies with different FexSiy content. The rupture of SiC/FeiSty composites increased depending on elevating temperature and decreased after transition temperature Tm （90℃）. The thermal conductivity of composites decreased depending on elevating temperature. From 20℃ to 250℃ thermal conductivity decreased rapidly and slowly after 250℃. The coefficient of linear expansion increased depending on elevating temperature and varied rapidly after 800℃.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2011年第2期95-99,共5页
Materials Reports
基金
国家科技支撑计划(2006BAC02A14)
