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吸湿性强是水玻璃砂工艺的一个较难解决的问题,尤其在我国南方的梅雨季节,型砂的吸湿性给生产带来了很大的麻烦,如砂型的硬透性差、易产生蠕变等。测试了粉末硬化、酯硬化、微波硬化三种典型水玻璃砂型,存放于高湿度环境中的吸湿量、强度变化情况及强度损失率;通过XRD测试了三种典型水玻璃砂硬化工艺粘结剂膜的成分,分析了它们的吸湿机理;讨论了三种典型硬化水玻璃砂工艺吸湿后的强度损失机制,为解决水玻璃砂型的吸湿性问题奠定了理论基础。
High hygroscopicity is a difficult problem to be solved in the process of sodium silicate sand. Especially in the rainy season in southern China, the hygroscopicity of the sand brings great troubles to the production. For example, the sand type has poor hard permeability, easy creep, etc. . Three types of typical sodium silicate sand, such as powder hardening, ester hardening and microwave hardening, were tested for moisture absorption, strength change and strength loss in high humidity environment. Three typical water glass sand curing binders were tested by XRD The mechanism of moisture loss of three typical hardened sodium silicate sandwiches was discussed, which laid a theoretical foundation for solving the problem of hygroscopicity of sodium silicate sandwiches.