连续Si-C-Fe-O功能陶瓷纤维的制备

PREPARATION OF CONTINUOUS Si-C-Fe-O FUNCTIONAL CERAMIC FIBERS

为了改善碳化硅纤维的电磁性能,首次由聚二甲基硅烷和二茂铁合成了聚铁碳硅烷,当二茂铁的添加量(以质量计)为2%时,所制得的聚铁碳硅烷经熔融纺丝、预氧化,惰性气氛中烧成后,可制得低电阻率(10-2Ω·cm)、拉伸强度为2.0GPa、长度大于500m的连续SiC FeO纤维。探索了连续SiCFeO纤维的制备工艺。研究了铁对纤维电阻率和βSiC结晶的影响。结果表明:铁含量的增加有利于βSiC晶粒的增长和电阻率的降低。

In order to modify the electromagnetic properties of silicon carbide fibers, a polyferrocarbosilane (PFCS) was first synthesized from polydimethylsilane and ferrocene. Si-C-Fe-O fibers with low specific resistance of 10-2Ω&middotcm were prepared after the PFCS was melt-spun, cured by heating in air and sintered under an inert atmosphere when the amount of ferrocene added was 2% in mass. The tensile strength of the fiber is about 2.0 GPa, and the length of the fiber is more than 500 m. The technique for preparing continuous Si-C-Fe-O fibers was investigated. With the increase of the element Fe contained in the fibers, the growth of β-SiC crystalline grain is accelerated and the specific resistance decreases.