| 摘要 |
PURPOSE:To prepare an amorphous refractory having excellent hot flowability, not generating a warpage phenomenon and having a high adhesive force by kneading a refractory material with a specific phenolic resin solution in such a range as giving a prescribed amount of the phenolic resin content. CONSTITUTION:A refractory material is mixed and kneaded with a phenolic resin solution prepared by dissolving a novolak phenolic resin having a number- average mol.wt. of <=600 in an organic solvent in a phenolic resin concentration of 3.5-10wt.% to provide an amorphous refractory. As the amorphous refractory a refractory most desirably generating no warpage but generating a warpage of desirably <=4mm, more desirably 3.5mm on the consideration of the state thereof in an oven is preferable. When the content of the novolak phenolic resin is low, i.e., approximately 3%, in the composition, the warpage is not generated or slightly generated, but the binding of the refractory caused by the carbonization of the phenolic resin is insufficient and the lowering of the strength occurs. The content of the novolak phenolic resin in the composition is preferably 3.5-10wt.%. |
