铝酸钙水泥对氧化镁系包埋料性能的影响  

Influence of CA cement on properties of MgO-based investment materials

作　　者：余桂林[1] 李楠[2] 李友胜[2] 王贻宁[3] 

机构地区：[1]武汉科技大学医学院,湖北武汉430065 [2]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081 [3]武汉大学口腔医学院,湖北武汉430072

出　　处：《武汉科技大学学报》2010年第2期160-163,共4页Journal of Wuhan University of Science and Technology

基　　金：武汉科技大学博士科研启动基金资助项目(J090097)

摘　　要：以铝酸钙水泥作为结合剂、电熔氧化镁和电熔白刚玉作为原料以及刚玉球作为混磨介质,在聚氨酯滚筒中混磨2 h后制得氧化镁系包埋料,研究结合剂铝酸钙水泥含量对氧化镁系包埋料性能的影响。结果表明,随着铝酸钙水泥含量的增加,氧化镁系包埋料的初凝时间缩短,流动性变差;对比110℃热处理试样,经900℃热处理试样显气孔率上升,体积密度下降。当铝酸钙水泥含量大于20%时,铝酸钙水泥的加入可明显地提高氧化镁系包埋料的耐压强度。To prepare MgO-based investment materials, CA cement as binder, MgO and Al2O3 as raw materials were mixed for 2 h in polyurethane pots using alumina balls. The influence of CA cement on the properties of MgO-based investment materials was studied. The results show that, with the in- crease in CA cement content, the fluidity of MgO-based investment materials decreases and so does the initial setting time. The apparent porosity of the specimen heated at 900℃ increases and the bulk density decreases, as compared with the specimen heated at 110 ℃. When CA cement content is more than twenty percent, the compressive strength of the investment increases with the increase of CA cement content.

关 键 词：铝酸钙水泥 包埋料 流动性 耐压强度 

分 类 号：TQ175.713[化学工程—硅酸盐工业]