%0 Journal Article %T 国产Hi-Nicalon型SiC纤维热处理后微观结构及性能演化 %T Evolutions of Microstructures and Properties of SiC Fibers Annealed at Elevated Temperatures %A 金恩泽 %A 孙文婷 %A 孙新 %A 王昊 %A 李军平 %A JIN,Enze %A SUN,Wenting %A SUN,Xin %A WANG,Hao %A LI,Junping %J 宇航材料工艺 %J Aerospace Materials & Technology %@ 1007-2330 %V 49 %N 2 %D 2019 %P 36-40 %K SiC纤维;热处理;束丝强度;微观结构 %K SiC fiber;Anneal;Tensile strength;Microstructure %X 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。 %X 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 %R 10.12044/j.issn.1007-2330.2019.02.007 %U http://www.yhclgy.com/yhclgy/home %1 JIS Version 3.0.0