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CN102503485A 一种氮化烧成的Al2O3-C质耐火材料及其制备方法 无效 - 撤回

一种氮化烧成的Al2O3-C质耐火材料及其制备方法
摘要：
本发明具体涉及一种氮化烧成的Al2O3-C质耐火材料及其制备方法。其技术方案是：先将55～94wt%的刚玉、5～20wt%的鳞片石墨和1～30wt%的金属Si细粉为原料混合，外加所述原料3.5～8wt%的结合剂，混碾10～30分钟。将混碾后的混合料压制成所需的Al2O3-C质耐火材料产品的生坯，再将压制成的生坯经180~220℃烘烤，然后装入高温窑内于1350~1700℃和N2气氛条件下保温1~8小时，制得氮化烧成的Al2O3-C质耐火材料。氮化烧成的Al2O3-C质耐火材料包括定型Al2O3-C质耐火砖、钢水连铸用Al2O3-C质保护管、钢水浇注用Al2O3-C质滑板和水口砖。本发明具有强度高、抗氧化、使用寿命长、抵抗高温熔体的冲刷与侵蚀性能好的特点。
摘要（英）：

The invention relates to an Al2O3-C refractory fired by nitridation and a preparation method for the Al2O3-C refractory. According to the technical scheme, the preparation method comprises the following steps of: mixing 55 to 94 weight percent of corundum, 5 to 20 weight percent of crystalline flake graphite, 1 to 30 weight percent of metal Si fine powder which serve as raw materials, adding a bonding agent in an amount which is 3.5 to 8 percent of the weight of the raw materials, and mixing and grinding for 10 to 30 minutes; and pressing the mixed and ground mixture to form a raw blank of the required Al2O3-C refractory, baking the pressed raw blank at the temperature of between 180 and 220 DEG C, putting into a high-temperature kiln, and keeping the temperature at the temperature of between 1,350 and 1,700 DEG C under the atmosphere of N2 for 1 to 8 hours to obtain the Al2O3-C refractory fired by the nitridation. The Al2O3-C refractory fired by the nitridation comprises a case-hardened Al2O3-C refractory brick, an Al2O3-C protective tube for the continuous casting of molten steel, an Al2O3-C sliding plate for the pouring of the molten steel and a nozzle brick. The Al2O3-C refractory has the characteristics of high strength, oxidation resistance, long service life and high performance of resisting the washing and erosion of high-temperature melts.

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