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国产Hi-Nicalon型SiC纤维热处理后微观结构及性能演化
金恩泽,孙文婷,孙新,王昊,李军平
航天材料及工艺研究所,先进功能复合材料技术重点实验室,北京 100076
摘要:
为考察国产Hi-Nicalon型SiC纤维在高温下的结构-性能演化规律,对国产Hi-Nicalon型SiC纤维分别在空气和氩气环境下进行了不同温度热处理,并对纤维的微观结构及纤维束丝力学性能演化进行了表征与测试。结果表明,在空气环境下,当超过1100℃时,国产Hi-Nicalon型SiC纤维束丝强度开始下降,伴随着纤维表面生成SiO2氧化膜,当温度超过1200℃时,纤维表面会形成SiO2氧化膜鼓泡。在氩气环境下1100~1500℃时,纤维束丝强度开始发生缓慢劣化。当热处理温度超过1500℃时纤维束丝强度开始加速劣化,伴随着纤维开始发生β-SiC到α-SiC相变以及SiC晶粒尺寸增大。
关键词:  SiC纤维  热处理  束丝强度  微观结构
DOI:10.12044/j.issn.1007-2330.2019.02.007
分类号:TQ343
基金项目:
Evolutions of Microstructures and Properties of SiC Fibers Annealed at Elevated Temperatures
JIN Enze,SUN Wenting,SUN Xin,WANG Hao,LI Junping
Science and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
In order to investigate the relations between microstructures and properties of SiC fibers, SiC fibers are annealed in air and Ar respectively at elevated temperatures in this study. The strength of SiC fibers annealed in air decreases as the temperature increases above 1100℃. When the temperature reaches 1 200℃, bubbles are formed in the silica layer. The strength of SiC fibers annealed in Ar decreases gradually as the temperature increases above 1100℃, while decreases sharply as the temperature increases above 1500℃. accompanied by the transition of β-SiC to α-SiC and the enhancement of SiC grain size
Key words:  SiC fiber  Anneal  Tensile strength  Microstructure