| 摘要 |
<p>The filter is prepared by impregnating a polymer foam with a ceramic slip which contains a phosphate binder, squeezing off the excess slip, drying and burning the foam material at temperatures of 1660 DEG C and higher, or with the same procedure by using a slip which contains a gelled aluminium hydroxide and burning at a temperature of at least 1093 DEG C. This gives ceramic filters having an open-cell foam structure, the ceramic being essentially phosphate-free and the individual crystals of the ceramic having mutually sintered together. The filters are suitable for the filtration of molten metals and especially for the filtration of molten iron and steel.</p> |
