一种镁砂粉与刚玉粉复合烧结铸型涂料的研制  

Development of Mould Coating by Composite Sintering of A Magnesia and Alumina Powder

作　　者：黄宏军[1] 赵双[1] 刘伟华[1] 侯志伟[1] 左晓娇[1] 袁晓光[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《热加工工艺》2015年第23期76-79,83,共5页Hot Working Technology

基　　金：沈阳市工业攻关计划项目(F12-008-2-00)

摘　　要：采用镁砂粉和刚玉粉作为耐火骨料制备了一种烧结型铸型涂料,实验研究了两种骨料的适宜配比,分析了骨料组元比例对烧结过程的影响;优化设计了一种以镁砂粉和刚玉粉为复合耐火骨料的铸型涂料配比,检测了涂料的性能。结果表明:复合骨料烧结后的涂层产生了镁铝尖晶石(Mg Al_2O_4),当镁砂粉和刚玉粉混合质量为7∶3时,涂层中的Al_2O_3全部参与烧结反应;硅溶胶(SiO_2·n H_2O)的加入可以改善涂层的高温强度,防止出现暴热裂纹;优化后的涂料具有较好的综合性能,能有效地防止不锈钢铸件表面出现粘砂现象。A kind of sintering mould coating was prepared by using refractoryaggregate of magnesia and alumina powder. Suitable ratio of two kinds of aggregates was studied through experiments. The effect of the aggregate component proportion on the sintering process was analyzed. A mould coating ratio of composite refractory aggregate of magnesia powder and alumina powder was designed and optimized, and the properties of the coating were tested. The results show that magnesia alumina spinel （MgAl2O4） is formed in the coating of composite aggregate after sintering. When the weight proportion of magnesia and alumina powder is 7：3, all Al2O3 in the coating participate in the sintering reaction. Adding ludox （SiO2. nH2O） can enhance the high temperature strength of the coating. It can prevent high temperature crack. The optimized coating has good comprehensive properties, and it can effectively prevent surface sticking sand of stainless steel casting.

关 键 词：不锈钢 铸型涂料 复合烧结 

分 类 号：TG221[金属学及工艺—铸造]