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系统地测定和分析了由硬化剂ＮＨ４Ｃｌ、ＡｌＣｌ３和ＭｇＣｌ２所硬化的型壳的常温、高温和残留强度，并对这三种硬化剂的硬化机理及强度上的差异提出了一些新的见解。只要硬化工艺合理，用ＭｇＣｌ２作硬化剂时型壳的常温强度较高，而残留强度低，高温强度和ＮＨ４Ｃｌ硬化的型壳相近，完全可代替ＮＨ４Ｃｌ和ＡｌＣｌ３作为型壳硬化剂，使生产成本下降。
The room temperature, the high temperature and the residual strength of the shell hardened by the hardeners NH4Cl, AlCl3 and MgCl2 were systematically determined and analyzed. Some new ideas about the hardening mechanism and strength difference of the three hardeners were put forward. As long as the curing process is reasonable, when the shell is hardened with MgCl2, the strength of the shell is higher at room temperature, while the residual strength is low, and the high-temperature strength is similar to that of NH4Cl hardened shell, which completely replaces NH4Cl and AlCl3 as the shell hardener and lowers the production cost .