热处理对碳化硅基复合材料结构与力学性能的影响  

Effect of Heat Treatment on Microstructure and Mechanical Properties of SiC Matrix Composites

作　　者：方逵[1] 丁德红[1,2] 赵爽[3] 

机构地区：[1]湖南农业大学,湖南长沙410128 [2]湖南文理学院,湖南常德415000 [3]海军工程大学,湖北武汉430033

出　　处：《稀有金属材料与工程》2016年第9期2449-2453,共5页Rare Metal Materials and Engineering

基　　金：湖南省研究生科研创新项目(CX2014B306);湖南省教育厅科研一般项目(14C0542)

摘　　要：碳化硅纤维增强碳化硅复合材料（Si C/Si C）是极具前景的高温结构材料。通过先驱体浸渍裂解（PIP）工艺制备了Si C/Si C复合材料。在惰性气氛下,1400～1800℃范围内对Si C/Si C复合材料进行热处理,用红外热像仪作为测温工具监测材料温度,研究了热处理温度对Si C/Si C复合材料结构和力学性能的影响。结果表明,经1400℃热处理后复合材料基体结晶程度增加,整体力学性能提高;随热处理温度进一步提高,复合材料纤维受损,力学性能急剧下降。Continuous SiC fibre reinforced SiC matrix composites（SiC/SiC） are promising high temperature structure materials, whose thermal stability is one of the key issues. In the present paper, 3D SiC/SiC composites were fabricated via the polymer impregnation and pyrolysis（PIP） process, and then were heat treated at 1400～1800 ℃ in an inert atmosphere with an infrared thermometer monitoring the temperature. The effect of heat treatment temperature on microstructure and mechanical properties of the composites was investigated. The results indicate that the mechanical properties of the SiC/SiC composites are improved after heat treatment at 1400 ℃ due to the increased crystallization. With further increasing the heat treatment temperature, however, the properties of the composites are decreased because of severe damage of the fibres and the matrix.

关 键 词：碳化硅基复合材料 热处理 微观结构 力学性能:红外热像仪 

分 类 号：TB332[一般工业技术—材料科学与工程]