考察了 Nicalon NL202 SiC 纤维经热空气环境脱胶之后，在惰性气氛下进行高温热处理前后，包括热失重、元素组成、物相组织、表面形貌、力学性能及电阻率等结构与性能所发生的变化。研究表明，热处理温度为1200℃时，主要是因高电阻率的连续相无定型态 SiCx O y 的分解，纤维电阻率大幅降低，介电损耗能力提升，有望用于吸波材料。而热处理温度超过1200℃时，剧烈的热分解，导致纤维结构的缺陷；且快速的晶化，导致纤维拉伸断裂模式由非晶态脆性断裂转变为多晶态沿晶断裂。所有这些，都导致纤维强度的显著下降。
The commercial Nicalon 202 SiC fiber was exposed in thermal air to degum and heat treated in argon gas from 1 100 to 1 400 ℃.Change of the chemical,structural and electrical properties of the resultant fibers as a function of thermal treatment temperature were studied.The results showed that the SiCx Oy phase decom-posed evidently above 1 200 ℃,which led to the formation and crystallization of SiC.With the raise of the heat-ing temperature,the tensile strength of fiber decreased,the specific conductivity and dielectric loss of the fiber increased.Moreover,after heating at 1 400 ℃ the fracture behavior of the fiber turned to intergranular mode from amorphous brittleness mode.
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