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以白刚玉、锆英石为原料制备了Al2O3-ZrO2质风口衬套样,采用静态熔渣法在1500℃保温2h进行高炉渣侵蚀试验。对侵蚀后的试样进行SEM分析,并研究其侵蚀机理。结果表明:侵蚀试样从热面到冷面侵蚀区域主要分为两层,且CaO含量逐渐减少,SiO2含量增多。在试验条件下,锆英石在碱金属Na存在的条件下容易分解生成ZrO2和SiO2;同时,SiO2、Al2O3与渣中CaO反应生成低熔点玻璃相物质,使材料的耐火度降低。
Al2O3-ZrO2 tuyere bushing sample was prepared from white corundum and zircon, and the blast furnace slag erosion test was carried out by static slag method at 1500 ℃ for 2h. The eroded samples were analyzed by SEM and the erosion mechanism was studied. The results show that the eroded specimen is mainly divided into two layers from the hot surface to the cold surface, and the content of CaO gradually decreases and the content of SiO2 increases. Under the experimental conditions, zirconia is easily decomposed to form ZrO2 and SiO2 in the presence of alkali metal Na. At the same time, SiO2 and Al2O3 react with CaO in the slag to produce a low-melting glass phase material, thereby reducing the refractoriness of the material.