| 摘要 |
PROBLEM TO BE SOLVED: To extend the durable life of a refractory material by using a material containing each specified amt. of alumina, magnesia containing a specified amt. or larger periclase, and carbon and using a phenol resin or other org. binders or a combination of these. SOLUTION: The refractory material consists of 45 to 90wt.% alumina, 5 to 30wt.% magnesia containing >=5wt.% periclase crystal, and 5 to 25wt.% carbon, and a resin binder such as a phenol resin. Further, the refractory material contains a metal powder such as an aluminum powder and silicon powder to prevent oxidation by 0.5 to 10wt.% to 100wt.% of the material above described. As for the alumina source material, an electric galvanized alumina, sintered alumina containing >=80wt.% alumina is used. As for the spinel source material, sintered clinker is used. As for the magnesia source material, electric galvanized magnesia having >=80wt.% magnesia is used. As for the carbon source material, natural or artificial graphite can be used. These components for the refractory material are compounded in specified proportions, kneaded, formed and heat treated at specified temp. to obtain a brick for a furnace hearth. |
