materials. Boron carbide is an example of a material where preparation from a polymer precursor might offer advantages over conventional synthetic techniques. Mixed B/sub 4/C-SiC ceramics have, in fact, been previously obtained from pyrolysis of poly(carboranesiloxane) polymers; however, a synthesis of pure B/sub 4/C from polymeric precursors has heretofore not been developed. They report here that 2-(H/sub
传统陶瓷加工的局限性激发了人们对聚合物热解作为非氧化物陶瓷材料的低温合成途径的开发和利用的兴趣。
碳化硼是一种材料,其中从聚合物前体制备可能比传统合成技术更具优势。事实上,混合 B/sub 4/C-SiC 陶瓷以前是通过聚(碳
硼烷硅氧烷)聚合物的热解获得的;然而,迄今为止尚未开发出由聚合前体合成纯 B/sub 4/C。他们在此报告称,2-(H/sub 2/C=CH)-B/sub 5/H/sub 8/ 将经过热聚合生成
乙烯基五
硼烷低聚物,并且这些物质可以转化为纯
碳化硼 (B/sub 4 /C) 在温和条件下获得高陶瓷产率。