| 摘要 |
A hard-faced ceramic fiber module is formed by providing a ceramic fiber sheet that is folded upon itself to form a first surface having adjacent folds and intermediate valleys by impregnating the first surface with an aqueous colloidal silica suspension, covering said impregnated first surface with a layer of a mixture of ceramic fibers in an aqueous colloidal suspension, compressing said layer, freezing said module and then heating the same to remove substantially all of the water.
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