摘要
采用溶胶凝胶法 ,以正硅酸乙酯和酚醛树脂为原料 ,在草酸和六次甲基四胺的催化作用下 ,制备出了不含硫和氯等有害杂质的均相碳化硅先驱体 ,并在特定条件下 ,对所得先驱体进行烧结 ,使之转化为陶瓷。结果表明 ,溶胶凝胶法制得的先驱体呈黄色透明的玻璃态 ,其微观组成为几十纳米的微粒 ,树脂与SiO2 可能通过氢键相互作用 ,有利于树脂在先驱体中均匀分布而形成均相先驱体 ,其陶瓷产率为 78% ;另外硝酸镍的加入对先驱体烧结过程中 β -SiC的生成起到明显的促进作用。
Homogeneous silicon carbide precursor without impurities such as sulfur, chlorine and etc. is prepared from tetrathoxysilane (TEOS) and phenolic resin catalyzed by oxalic acid and hexamethylenetramine (HMTA) by using sol gel process.After sintering under a certain condition, the precursor is translated into ceramic powder and its ceramic yield is 78%. Related SEM photographs show that the precursor, which is in yellow and transparent glass state, is composed of nano sized particles. Phenolic resin and SiO 2 may interact through hydrogen bonding, which is propitious to synthesizing homogeneous precursor. Further studying indicates that the introduction of nickel nitrate as catalyst to the sintering process promotes the formation of β SiC apparently.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2002年第3期27-29,共3页
Aerospace Materials & Technology
基金
国家自然科学基金 :5 980 2 0 12
