| 摘要 |
1334031 Refractories SOC GENERALE DES PRODUITS REFRACTAIRES 9 July 1971 [9 July 1970] 32418/71 Heading C1J A semi-rigid insulating refractory of M.Pt. # 1500‹ C. and SÀG. # 0À9 contains, in wt. per cent, neutral mag. phosphate 12-25; silica 50-80; mineral fibres 2-20; A.E.M. oxides 0-5; and acid oxides 0-20; and is obtained by forming an aqueous mixture of silica, magnesia, mineral fibres, Œ the optionals, and an acid phosphate of magnesium, pouring into a mould, allowing it to gel and then harden by formation of hydrated neutral phosphate, and stoving at 100-350‹ C. to remove at least 75% of its water content. SiO 2 can be partly replaced by Al 2 O 3 , ZrO 2 , Cr 2 O 3 and TiO 2 . The fibres can be asbestos or of alumina. |
