Abstract: The present invention provides a thermal insulation coating material for a carbon-containing refractory that prevents surface oxidation of the carbon-containing refractory and that can form a thermal insulation layer when heated at a high temperature. The thermal insulation coating material for a carbon-containing refractory according to the present invention is characterized by including a refractory material containing hollow refractory particles whose content is 50 to 97% by weight and a part or the whole of the balance being clay with the content of the clay being 30% by weight or less and a liquid binder added to the refractory material in an amount of 20 to 170% by weight in outer percentage.

Abstract: A carbon-containing refractory is formed by mixing 1-10 weight % of silicon nitride, 1-35 weight % of carbon, and a remainder of a refractory raw material, molding the mixture into a molded body, and burning the molded body such that fine whiskers of silicon carbide are uniformly distributed within the matrix.

Abstract: A carbon containing refractory comprising, by weight: 5 to 60% of AZT clinker mainly constituted by ZrO.sub.2, Al.sub.2 O.sub.3, TiO.sub.2 and SiO.sub.2 ; 3 to 40% of a carbon source; and the balance being at least one or two refractories selected from a group consisting of alumina, magnesia, zirconia, mullite, spinel, calcia, and fused quartz.