通过烧成制备电阻率不同的4种SiC纤维,并对纤维的元素组成、结晶性能和表面结构进行分析.结果表明:通过调整不熔化及烧成工艺参数可以获得电阻率量级不同的SiC纤维.当纤维表层具有一定厚度的高富碳层结构时,纤维的电阻率受整体自由碳含量与结晶性能的影响不显著,此时,纤维具有较低的电阻率.富碳层的产生与不熔化纤维烧成时分解产生的烃类小分子的重新裂解沉积有关.通过低温氧化除去纤维表面的富碳层可以使纤维的电阻率增大.表面结构对连续SiC纤维的电阻率有重要影响.
Four kinds of SiC fibers with different specific resistivities were prepared by the pyrolysis of cured polycarbosilane fiber.The results show that SiC fibers with different specific resistivities can be obtained by changing the curing and pyrolysis conditions.And the free carbon content and the ability to crystallize no longer affect the specific resistivities notably with the time when the fiber is covered with an excess carbon layer,and the fiber has a low specific resistivity.The excess carbon layer in the circular outer part is originated from the re-pyrolysis and deposition of hydrocarbon volatiles.The removal of the carbon by oxidative treatment may affect the surface property and also promote the magnitude of specific resistivity,The influence of the surface property on the specific resistivity can be considerable and should not be neglected.
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