含镍碳化硅纤维的制备及其电磁性能Ⅰ.含镍碳化硅纤维的制备

Preparation and Electromagnetic Properties of Silicon Carbide Fibers Containing Nickel Ⅰ. Preparation of Silicon Carbide Fibers Containing Nickel

将纳米金属镍均匀分散到聚碳硅烷中 ,通过熔融纺丝、不熔化处理、烧成 ,制备出含镍碳化硅纤维。发现掺杂纳米镍使聚碳硅烷熔融纺丝温度提高 ,所纺纤维直径增加。不熔化处理过程中控制纤维增重率为 9%～ 11%时所制备的碳化硅纤维具有最佳力学性能。含镍碳化硅纤维的最佳烧成温度为12 5 0℃。镍在陶瓷纤维中的主要存在形态是镍硅金属间化合物。纳米镍的引入促进了烧成过程中 β -SiC晶粒的生长。

Nano-nickel particles were dispersed into polycarbosilane (PCS) homogeneously and subsequently the silicon carbide (SiC) fibers containing nickel were prepared by melt spinning,curing treatment and sintering.It was discovered that the melt spinning temperature of PCS and the diameter of PCS fibers increased after adding nano-nickel particles. When the weight-gain of PCS fibers caused by the curing treatment reaches to 9%～11% at optimum the pyrolytic temperature was 1250℃,the ultimate SiC fibers possessed the highest tensile strength. The forming Ni was intermetallics in ceramic fibers and adding nano-Ni particles accelerated grain growing of β-SiC during pyrolytic process.