一、前言国内熔模铸造大多采用氯化铵水溶液硬化水玻璃涂层制备型壳。这种方法虽然具备很多优点,但在硬化过程中由于生成大量氨气,影响工人身体健康,另外氯化铵水溶液对设备腐蚀严重。因此,选用一种新的硬化剂代替氯化铵就成了熔模铸造中一个急需解决的重大课 First, the foreword Most of the domestic investment casting with ammonium chloride aqueous solution hardened water glass coating preparation shell. Although this method has many advantages, but in the hardening process due to generate large amounts of ammonia, affecting the health of workers, while another aqueous solution of ammonium chloride corrosion of the equipment serious. Therefore, the choice of a new hardener instead of ammonium chloride has become an important part of investment casting in urgent need of solution