消失模壳型铸造的高强型壳研究  

Study on High-Strength Ceramic Shell of Expendable Pattern Casting

作　　者：廖德锋[1] 樊自田[1] 蒋文明[1] 申恩强[1] 刘德均[1] 

机构地区：[1]华中科技大学材料成形及模具技术国家重点实验室,湖北武汉430074

出　　处：《铸造》2010年第12期1333-1336,共4页Foundry

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA03Z113)

摘　　要：型壳制备是消失模壳型铸造的关键技术之一。针对硅溶胶型壳干燥慢、湿强度低的问题,试验研究了添加有机低温粘结剂后的型壳性能。试验结果表明:撒砂材料添加有机粘结剂粉末能够提高型壳的湿强度,其中聚乙烯醇(PVA)的提高幅度最大,达到20%,然后依次为糊精、羧甲基纤维素钠(CMC)、α淀粉,提高幅度分别达到11.3%、9.4%、5.0%。Production of ceramic shells is a crucial part of the ceramic shell expendable pattern casting（EPC）process.Considering the long drying time and low wet-strength of ceramic shells produced with silica sol,the commonly used organic binders were added into silica sol,slurries or refractory stucco and the properties of the shell were investigated.The results show that adding of organic binder into refractory stucco can increase the wet-strength of shells.Among the investigated binders,PVA has the biggest influence on wet-strength,which is rised by 20%,and for dextrin,CMC and α-starch are rised by 11.3%,9.4% and 5.0%,respectively.

关 键 词：消失模壳型铸造 型壳 有机粘结剂 湿强度 

分 类 号：TG249.5[机械工程—精密仪器及机械]