目前,国内在研究改善水玻璃砂溃散性的过程中,一般是以残留强度的大小,或残留强度与初始强度之比值来衡量型砂溃散性的好坏。残留强度的测试方法普遍采用圆柱形或“∞”字试样,放入加热到预定温度的马弗炉(或箱式电阻炉…)中保温一段时间,然后随炉冷或取出炉外冷却到室温再测试其强度。人们早已发现,这种测试方法有其局限性,因试样的受热,冷却及其围气氛并不具备泥芯在铸件中承受的状态,故取得的结果不能充分代表型砂的落砂 At present, domestic research on the improvement of sodium silicate sand collapsibility is generally based on the size of the residual strength, or residual strength and initial strength ratio to measure the quality of sand collapse of good or bad. Residual strength test method commonly used cylindrical or “∞” the sample, placed in a muffle furnace (or box resistance furnace ...) heated to a predetermined temperature for a period of time, and then with the furnace cold or out of the furnace to cool to Test the strength at room temperature. It has long been found that this test method has its limitations, because the sample is heated, cooled and the surrounding atmosphere does not have mud core in the casting state, so the results obtained can not fully represent the sand falling sand