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新试验方法的特点是采用表面有Ｖ形沟槽的圆饼形型砂试件，在激热试验炉中受 到自下而上的高温烘烤。通过窥视孔可连续观察试件表面的脱皮现象和得出激热开裂时 间。试验结果表明测得数值相当集中并且稳定，而且与铸件上生成结疤缺陷的趋势完全一致。还研究了原砂的ＳｉＯ２量、紧实程度、紧实率、膨润土、重油、糊精、淀粉、纸浆废 液、煤粉等因素对激热开裂时间的影响。都能清楚地给出了有关砂型抗结疤性能的趋向。
The new test method is characterized by the use of the surface of the cake with a V-shaped pie-shaped sand sand samples, in the heat test furnace bottom-up high-temperature baking. Through the peephole can be continuously observed on the surface of the peeling phenomenon and the thermal cracking time. The test results show that the measured values are fairly concentrated and stable, and are in complete agreement with the tendency of scarring defects on the castings. The effects of SiO2 content, compaction degree, compaction rate, bentonite, heavy oil, dextrin, starch, pulping liquor and pulverized coal on the hot cracking time were also studied. Clearly gives the trend of anti-scarring performance of the sand.