聚硅碳硅烷(PSCS)与乙酰丙酮铝(Al(AcAc)3)在一定条件反应制备了耐高温SiC(Al)纤维先驱体聚铝碳硅烷(PACS).PACS通过熔融纺丝、预氧化处理、低温烧成、高温烧结等一系列工艺过程制备了耐高温SiC(Al)纤维.SiC(Al)纤维的化学组成为Si1C1.15O0.026Al0.013,主要结构是平均晶粒为95 nm的β-SiC,O和游离C含量均大大低于Nicalon纤维(O>10wt%,游离C>10wt%),同时含有微量的Al和少量的α-SiC.纤维表层O含量和Si含量略高于纤维内部,表面光滑平坦,没有明显表面缺陷. SiC(Al)纤维的平均直径为13 μm,平均强度为2.3 GPa,1400℃氩气中处理1 h,强度保留率95%以上;1800℃氩气中处理1 h,强度保留率为71%.纤维的高温稳定性高于Nicalon纤维,低于Tyranno SA纤维.
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