| 摘要 |
<P>PROBLEM TO BE SOLVED: To inhibit a hydration reaction in a spinel added alumina-carbon unfired brick, to enhance corrosion resistance to various slags and hot strength, and to improve thermal conductivity maintaining characteristics so as to reduce heat loss by release from a molten metal holding furnace. <P>SOLUTION: The alumina-carbon unfired brick for lining a molten metal holding furnace is provided which is obtained by adding an organic binder to a refractory raw material composition consisting of 6-25 mass% of a carbon raw material, 0.1-4 mass% of aluminum and/or aluminum alloy, 2-20 mass% of a spinel ultrafine powder and the balance essentially an alumina raw material, kneading these, molding and heat treating at ≤1,000°C. The spinel ultrafine powder in the refractory raw material composition has a particle size of <150 μm and an average particle diameter of 0.1-50 μm and consists of 25-50 mass% of MgO and the balance Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>. <P>COPYRIGHT: (C)2012,JPO&INPIT |
