氧化铝基陶瓷型芯的高温沸腾脱芯工艺研究  

Study on Leaching-Out Technics of Alumina-Based Ceramic Cores Using High Temperature Boling Alkaline Solutions

作　　者：李彪[1] 娄延春[1] 于波[1] 苏贵桥[1] 刘孝福[1] 李长春[1] 郭新力[1] 

机构地区：[1]沈阳铸造研究所,辽宁沈阳110022

出　　处：《铸造》2015年第11期1074-1077,共4页Foundry

基　　金：科技部国家国际科技合作项目(2011DFR70820)

摘　　要：氧化铝基陶瓷型芯强度高,耐高温性能好,但脱出性较差,影响了型芯的广泛使用,有必要对其脱芯工艺进行研究。本试验以高温沸腾的KOH溶液为脱芯液,测得了质量浓度为60%和70%的KOH溶液在不同压力下的沸点;研究了脱芯液浓度和沸点温度对氧化铝基陶瓷型芯脱芯率的影响,得出优化试验参数为:脱芯液浓度70%,压力3.8 MPa,温度380℃或脱芯液浓度70%,压力4.2 MPa,温度390℃,并对优化试验参数进行工艺验证。Alumina-based ceramic cores show high strength and good performance at high temperatures while poor leach ability limits the application of the cores. Thus it is essential to study the leaching-out technics. Boiling KOH solutions at high temperatures were used as leaching agents and boiling points of KOH solutions with mass concentrations of 60% and 70% at different pressures were determined in the paper. The effects of mass concentrations and boiling points of alkaline solutions on core leaching rates were also investigated, the optimal parameters were obtained： mass concentration 70%, pressure 3.8 MPa and temperature 380 ℃, or mass concentration 70%, pressure 4.2 MPa and temperature 390 ℃. Validation experiments for the optimal parameters were then carried out.

关 键 词：氧化铝基陶瓷型芯 沸腾碱液 脱芯技术 

分 类 号：TG24[金属学及工艺—铸造]