铸造2012，Vol.61Issue(4)：382-385,4.
微波硬化表面包覆低共熔体锂盐水玻璃砂抗吸湿性初步研究
Preliminary Study on Humidity Resistance of Sodium Silicate Sand Hardened by Microwave Heating Coated with Eutectic Lithium Salts
摘要
Abstract
A coating method of eutectic lithium salts on the surface of sodium silicate sand was introduced. The eutectic lithium salts (0.38LiOH-0.62LiNO3) were sprayed on the surface of sodium silicate sand and then sintered by microwave energy to obtain glassy membrane for its lowest eutectic point of 175.7 ℃, so the humidity resistance of sodium silicate sand hardened by microwave heating was improved greatly. The results show that the hardening temperature of coating sand mold was about 370 ℃, which was higher than that of uncoated one (110 ℃) by microwave heating, and the strength of coating sand mold was higher than the uncoated one. After 4 h storage in humidistat with relative humidity of 98%-100%, strength of coating sand mold increased by two times comparing with the uncoated microwave hardening one. The SEM photos show that there was a layer of compact glassy membrane between the surface and inner to protect the inner high strength sand mold from the humidity erosion.关键词
水玻璃砂/微波硬化/抗吸湿性/包覆/低共熔体锂盐Key words
sodium silicate sand/ microwave hardening/ humidity resistance/ coating/ eutectic lithium salts分类
矿业与冶金引用本文复制引用
汪华方,樊自田,刘富初,李雪洁..微波硬化表面包覆低共熔体锂盐水玻璃砂抗吸湿性初步研究[J].铸造,2012,61(4):382-385,4.基金项目
国家自然科学基金项目资助(51075163). （51075163）
