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采用二次微波加热工艺制备硫酸镁水溶性砂芯,测试研究了增强剂高岭土对硫酸镁水溶性砂芯性能的影响,对比分析了二次微波加热制备的硫酸镁水溶性砂芯和二次微波硬化水玻璃砂的性能特征,通过扫描电子显微镜(SEM)分析了硫酸镁水溶性砂芯的微观形貌,采用优化配方的硫酸镁水溶性砂芯进行了AZ91D的浇铸试验.试验结果表明:二次微波加热制备的硫酸镁水溶性砂芯具有较高的抗拉强度、表面安定性和抗吸湿性,砂芯铸后的水溶溃散性良好,具有良好的应用前景.SEM分析结果表明:加入高岭土后水溶性砂芯粘结桥中的裂纹和孔隙减少,断裂方式由内聚断裂变成复合断裂.
The secondary magnesium heating process was used to prepare the water-soluble sand core of magnesium sulfate. The effect of the reinforcing agent kaolin on the performance of the water-soluble sand core of magnesium sulfate was studied. The water-soluble magnesium sulfate sand core and secondary microwave The microstructure of hardened sodium silicate sand was characterized by scanning electron microscopy (SEM). The microstructure of magnesium silicate water-soluble sand core was analyzed and the casting experiment of AZ91D was carried out by using the optimized formula of magnesium sulfate water-soluble sand core.The results showed that: The water-soluble magnesium sulfate sand core prepared by sub-microwave heating has high tensile strength, surface stability and anti-hygroscopicity, good water-soluble and collapsibility after sand core casting, and has good application prospect.SEM analysis results show that adding kaolin The cracks and pores in the water-soluble sand core bond bridge decrease, and the fracture mode changes from cohesive fracture to composite fracture.