Manufacturing of biomorphic (Si, Ti, Zr)-carbide ceramics by sol-gel processing

作者：Rambo CR; Cao J; Rusina O; Sieber H^*

来源：Carbon, 2005, 43(6): 1174-1183.

DOI：10.1016/j.carbon.2004.12.009

• biomorphic carbides
• biotemplating.
• sol-gel process
• carbothermal reduction

Biomorphic (wood derived) carbide ceramics with an overall composition in the systems MeC/C (with Me = Si Ti, Zr) were produced by vacuum infiltration of low viscosity organo-metallic colloidal suspensions into biologically derived carbon templates. After hydrolysis into Me(OH)(4)-gels, the Me(OH)(4)-gel/C-templates were submitted to a high temperature pyrolysis/reaction treatment at 1600 degrees C to promote (i) the polycondensation of the Me(OH)(4)-gels into the corresponding MeO2-phase and (ii) the carbothermal reaction of the MeO2 with the biocarbon template into highly porous, biomorphic SiC/C-, TIC/C- and Zi-C/C-ceramics. The influence of the initial porosity of the biocarbon template on the final phase composition and morphology of the formed biomorphic McC/C-ceramic composites is analysed.

• 出版日期2005-5