| 摘要 |
<p>Large, dense chromic oxide refractory blocks containing from about 80 % to about 98 % chromic oxide are made by firing a green block comprising, in addition to the chromic oxide, titania and a colloidal silica having a surface area of at least about 90 m2/g. Blocks having porosities as low as 0 % are made in either an oxidizing or a reducing atmosphere. The blocks are crack-free and have a good resistance to corrosion by molten glass.</p> |
