中文摘要：

铸造用水玻璃砂遇高温金属液作用而发生化学及物理反应，属硅酸盐体系下的高温反应。从化学反应原理出发，分析了硅酸盐体系高温下反应机制，探求了降低水玻璃砂高温残留强度的改性材料，从水玻璃改性和原砂改性两方面试验研究了改性粉末材料对水玻璃砂的改性效果。结果表明，当生成物为K[A1Si3O8]（即钾长石）时，其熔点高、膨胀系数大，在高温下不易与水玻璃膜融合而形成均匀的陶瓷釉质膜，有利于改善水玻璃砂的溃散性。借助扫描电镜对改性与否的水玻璃砂高温残留强度砂样的微观形貌，进行了分析对比。

英文摘要：

Sodium silicate sand can generate chemical and physical reactions when contacting with high temperature metal liquid. The reactions belong to high temperature reactions of silicate. The high temperature reactional mechanism of silicate was analyzed and the modified material to reduce the retained strength of sodium silicate sand from principle of chemical reaction was looked-up. The effect of modified power material in modifying sodium silicate and raw sand was studied. The results indicated that the production is potash feldspar which has high melting point and huge swell factor can improve collapsibility. That is because it fusioned with sodium silicate film and form uniform ceramic enamel film difficult in high temperature. The microstructure of the common sodium silicate sand and modified sodium silicate sand in high tcmpecrature was analyzed and contrasted by SEM.