硅源对植物纤维制备SiC纤维的影响

Effect of Silicon Source on Biomorphic Si C Fibers Converted from Natural Fibers

将植物纤维转化为陶瓷是一种新型的、极具发展潜力的多孔陶瓷制备方法。本研究探索了将植物纤维转化为多孔Si C纤维的方法,并分析了硅源对其反应产物的影响。结果表明,由于密度效应,气相硅陶瓷化相比液相而言,具有更慢的反应速率,表面所含的杂质也更少,而且具有更可控的反应过程、更高的力学强度等优势。不同种类的硅源对反应速率、反应所需温度和产物的晶粒尺寸都有一定的影响,研究发现Si O是一种较为理想的硅源物质。

Converting the natural fibers into biomorphic ceramics has been a novel and promising method to pro- duce porous ceramics. This research explored a novel preparation method of biomorphic SiC fibers （SiCf）, and its silicon source＇s effects on the production. The results suggest that the silicon in vapor, compared to melting silicon, can provide much slower reaction velocity which can enable the reaction more controllable, leading to stronger mechanical properties of the final product, the SiC fiber. Besides, different kinds of silicon sources have great dif- ference in influence on the reaction rate, temperature, grain size and purity. Among the silicon sources, SiO is an ideal source of the porous SiC fiber.