【作者】 王得印； 毛仙鹤； 杨大祥； 宋永才； 王应德；

【Author】 Wang De-yin Mao Xian-he Yang Da-xiang Song Yong-cai Wang Ying-de (State Key Lab of Novel Ceramic Fibers & Composites,National University of Defense Technology,Changsha 410073)

【机构】 国防科技大学新型陶瓷纤维及复合材料重点实验室；

【摘要】 通过化学气相交联、引入烧结助剂的方法分别制备了低电阻率SiC纤维和高耐温性SiC纤维,并对两种纤维的组成、结构及性能进行了研究.研究表明:化学气相交联法制备的SiC纤维电阻率仅为0.5Ω·cm左右,纤维表面存在厚度约50nm的富碳层,并且在Ar气中进行高温热处理后电阻率始终保持在0.4～0.8Ω·cm;高耐温性SiC纤维强度1.6～2.2GPa,结晶性高,在1800℃的Ar气氛中处理1h,强度保留率约为70%,在1500℃的空气气氛中处理1h,强度保留率约为80%.更多还原

【Abstract】 Low specific resistance SiC fiber can be prepared by the pyrolysis of polycarbosilane(PCS) fiber cured with unsaturated hydrocarbons.The specific resistance of the fiber is about 0.5Ω·cm,much lower than the general SiC fiber which is obtained from traditional air curing process.Results show the fiber has an excess carbon layer with a thickness about 50nm in the circular outer part,and the specific resistance almost remains at 0.4～0.8Ω·cm after thermal exposure test from the ambient to 1600℃in argon.SiC fiber which exhibits high-temperature stability can be obtained from the introduction of sintering aids such as aluminium and yttrium.The fiber with a high crystallinity has a tensile strength of 1.6～2.2GPa.After thermal exposure in argon and air,70%and 80%of the initial strength are well preserved after heat-treatment at 1800℃and 1500℃,respectively.更多还原