【摘要】 以电镀Ni颗粒为催化剂,采用化学气相沉积(CVD)法,在炭纤维表面原位生长SiC纳米纤维(SiC-NF),制备出SiC纳米纤维/炭纤维共增强毡体。XRD和SEM分析表明生成的SiC纳米纤维物相为β-SiC,平均长度可达几十微米,直径在几十到几百个纳米之间。通过改变电镀镍的时间,研究了催化剂Ni颗粒的大小、形态及分布对SiC-NF生长情况的影响,研究结果表明,催化剂Ni颗粒分布越细小、均匀,催化活性越大,所生长的纳米SiC纤维也越细长,分布越均匀。更多还原

【Abstract】 A novel method of preparing carbon felts reinforced by both SiC nano-fibers(SiC-NF)and carbon fibers were introduced.Using nickel granules as catalysts,straight SiC-NFs were deposited on the surface of carbon fibers in-situ by the method of chemical vapor deposition(CVD).The microstructure and morphology of SiC-NFs were characterized by XRD and SEM respectively.Results show that,with the diameters between tens nm to hundreds nm,SiC-NFs exist in the form of β-SiC phase and have a length of several micrometers on average.Further more,the influences of size,shape and distributions of Nickel on the growth conditions of SiC-NF were studied.Results show that,the smaller the nano-granules are,more active the catalysts become.Then the SiC nano-fibers grown later are more spindly and have a more homogeneous dispersion also.更多还原