| 摘要 |
A nozzle for the casting of aluminium-killed steel, which is prepared from pellets obtained by mixing 90-99% Ca(OH)2, with at least one compound selected from the metal oxides Fe2O3, Al2O3 and TiO2 and the chlorides CaCl2, NaCl and LiCl, in quantities between 1 and 10%, the mixture being pelletized, dried at 100 DEG -150 DEG C. and baked at 800 DEG -1500 DEG C., grounded and screened, the screened material then being further mixed with at least one compound selected from among the metallic oxides Fe2O3, Al2O3, TiO2, ZrO2, and Cr2O3 and MoO3 and the chlorides CaCl2, NaCl and LiCl in quantities between 3 and 20% by weight, as well as with organic binders and carriers such as oil, paraffin, petroleum, lower alcohols and resins in quantities between 1 and 5%. The mix is pressed in molds at 500-1500 kg/cm2 and baked at 1500 DEG -1800 DEG C., the body thus obtained then being vacuum-impregnated with molten pitch and cooked at about 700 DEG C. in a reducing atmosphere. |
