磁化处理对铸造无机材料（水、水玻璃）性能的影响

【作者】 张岩；

【导师】 周继扬；

【作者基本信息】 大连理工大学 ， 材料加工工程， 2003， 硕士

【摘要】 本文利用强磁场设备系统研究了不同磁场条件(0-10T)对铸造用无机材料(水、水玻璃)及水玻璃砂性能的影响。 本文研究了水经过磁化处理后，各种物理化学性质的变化。研究结果表明磁化处理后，水的电导率和PH值呈下降的趋势，虽然表面张力也有下降，但不是线性的关系，与磁感应强度的关系是一条多极值曲线。为了更进一步的研究，本文通过分子动力学模拟的方法计算了磁场条件下水的内能，得到了水的内能和磁感应强度之间也呈多极值特征，曲线走向与实验结果一致，说明方法合理可信。 水玻璃经磁场处理可以降低粘度，提高水玻璃砂的粘结强度，不同磁场强度下的磁化效果不同。试验发现0.9～1T条件下，型砂的粘结强度升幅最大，效果最好，可提高46％，水玻璃的“老化”程度影响着磁化处理的效果，存放久的老化水玻璃磁化效果明显。由于磁化处理可提高水玻璃砂的粘结强度，从而降低型砂中水玻璃的加入量，改善水玻璃砂的溃散性，有很好的经济和社会效益。更多还原

【Abstract】 The paper is mainly studied the effects on properties of silicate bonded sand and inorganic material for foundry (water, sodium silicate) of different magnetic fields (0~1T) by ultra-strong magnetic device.The paper studied the change of physical and chemical properties of water after magnetization. Experiment results point that the electric conductivity and PH value are in a reducing trend. Although surface tension reduces too, but in a nonlinear way, the relation between surface tension and magnetic conduction intensity is multi-extreme num relation. In order to further study, the paper calculated the internal energy of water molecules by molecular dynamics simulations. The results point that the relation between the internal energy of water and magnetic conduction intensity is also multi-extreme num relation, the trend agrees with the experiment result, it proves that the simulation method is reasonable and comparable.The viscosity of sodium silicate may be reduced, thus the bond strength may be increased by magnetization. The magnetization result differs in different magnetic fields. The results point that the bond strength of foundry sand may be maximum increased by 46% in magnetic field of 0.9-IT. The aging level of sodium silicate will impact the effects of magnetization. The magnetization result of aged sodium silicate rested for long time is obvious. As the bond strength of silicate bonded sand will be increased by magnetization, the additional level of silicate bonded sand may be reduced, thus improving the collapsibility of the silicate bonded sand, yielding better economic and social returns.更多还原