| 摘要 |
A lightweight ceramic material is provided, useful for example as thermal insulation, kiln furniture or for metallurgical applications. Accordingly, a lightweight fired ceramic material comprises a set porous material in the form of a freeze-gelled ceramic sol composition containing hollow microspheres bonded together in a ceramic matrix. A method of making a lightweight fired ceramic shaped product is also provided in which a freeze-gellable ceramic sol composition is formed containing hollow microspheres, the composition is placed in a tool (21) of high thermal conductivity, the tool is cooled to irreversibly gel the sol composition, the monolith so formed is demoulded and allowed to thaw and is then fired to form a product comprising the microspheres bonded in a ceramic matrix.
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