Sol-gel method for making composite mullite/cordierite ceramics

摘要

A method for making composite mullite/cordierite ceramics comprises the steps of: preparing a mullite-intensive sol by mixing alumina and silica sols together at an Al2O3/SiO2 molar ratio of 1.37-1.76, preparing a cordierite-intensive sol by mixing alumina, silica and magnesia sols together, gelating a mixture of the mullite- and cordierite-intensive sols obtained at a weight ratio of 80:20-20:80 calcinating the thus obtained gel at 1200 DEG -1400 DEG C., and compacting and sintering the thus calcinated material at 1300 DEG -1450 DEG C.