中文摘要：

采用二次微波硬化水玻璃砂加热工艺,研究了微波加热水玻璃砂的性能变化,对比分析了二次微波加热水玻璃砂与一次微波加热水玻璃砂的强度变化趋势,测试了二次微波加热水玻璃砂的性能特征.试验研究结果表明：采用二次微波加热水玻璃砂工艺方法,加热时间短、硬化速度快、模具受热时间短,可采用普通木模和塑料模,显著降低了微波加热水玻璃砂对模具材料的要求;微波加热硬化水玻璃砂的性能受水玻璃加入量、加热功率与时间、环境湿度等因素影响;微波加热硬化水玻璃砂具有强吸湿性,提高微波加热硬化水玻璃砂的抗吸湿性是该工艺实际应用的关键.

英文摘要：

Twice microwave heating technology was applied to investigate the property change of sodium silicate sand. The intensity tendency of sodium silicate sand hardened by twice microwave heating was analyzed and compared, and the performance characteristics of the hardened sodium silicate sand were tested systematically in the paper. The results show that the twice microwave heating is a preferable method to once microwave heating. This method not only has advantages of short heating up time and high hardening speed, but also can use ordinary wood mould and plastic mould, which can greatly decrease the requirements on the mould material. The properties of sodium silicate sand are affected by many factors including addition amount of sodium silicate, the heating time, the power of microwave and the experimental atmosphere humidity, etc. In addition, the microwave heating hardened sodium silicate sand has strong hygroscopicity, so improving humidity resistance is the key problem of using the technology.