Sol-gel process for glass and ceramic articles

Details Sol-gel process for glass and ceramic articles Sol-gel process for glass and ceramic articles

C - Chemistry, Metallurgy

03

C

C03C 1/02 (2006.01) C03C 1/00 (2006.01)

Patent

CA 2071942

An improved sol-gel process is disclosed for fabri- cating large monoliths of silica or ceramic material, which are substantially free of cracks. Following forma- tion of the gel, but before the gel is dried, the gel is sub- jected to a hydrothermal aging treatment (50), in which it is heated in an autoclave to a temperature of between 100 and 300 °C, for a time duration of a at least about one hour. This hydrothermal aging treatment causes sili- ca (or ceramic) particles to migrate and fill small pores in the porous gel matrix, such that the average pore size increases and capillary forces encountered in the subse- quent drying step (70) are reduced to a point where cracking of the gel is substantially eliminated.

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