摘要
聚硅碳硅烷(polysilacarbosilane,PSCS)与乙酰丙酮铝[Al(AcAc)3]反应制备了含铝SiC陶瓷的先驱体聚铝碳硅烷(polyaluminocarbosilane,PACS),化学式为SiC2.01H7.66O0.13Al0.018,相对分子质量Mr=2265。PACS中主要存在如下结构:—Si(CH3)2—CH2—,—Si(CH3)·(H)—CH2—。PACS在N2气中的陶瓷化表明:600℃以下PACS是有机状态;900℃时,PACS中C—H,Si—CH3结构消失,PACS基本完成了无机化;1300℃左右PACS完全脱H,真正完成了无机化,转化为SiC陶瓷。1300℃以下陶瓷化产物的X射线衍射线很宽,产物为不定型结构。1500℃以上的陶瓷化产物为结晶度较高的SiC陶瓷。
Ceramic precursor polyaluminocarbosilane (PACS) was synthesized by the reaction of aluminum acetylacetonate (\ )with polysilacarbosilane (PSCS), which was prepared by the thermolysis and condensation of polydimethylsilane (PDMS). The empirical formula of PACS is SiC_(2.01)H_(7.66)O_(0.13)Al_(0.018), the number molecular weight (M_r) is 2 265. The chemical structure of PACS is —Si(CH_(3))_(2)—CH_(2)—,—Si(CH_(3))(H)—CH_(2)—. The conversion process of PACS to SiC ceramic was investigated by the techniques of Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction. The pyrolysis products in N_(2) gas below 600 ℃ were in organic state, C—H,Si—CH_(3) bonds in PACS disappeared at 900 ℃ and the organic PACS transformed into a inorganic state. By 1 300 ℃ this transition was essentially completed and an amorphous residue was obtained. Over 1 500 ℃, the pyrolysis products were the microcrystalline of silicon carbide.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第4期494-496,501,共4页
Journal of The Chinese Ceramic Society
关键词
聚铝碳硅烷
合成
陶瓷化
碳化硅陶瓷
polyaluminocarbosilane
synthesis
ceramization
silicon carbide ceramic
