典型方法和材料对水玻璃的改性效果与机制

研究比较了超声处理、纳米粉末改性、复合材料改性等水玻璃粘结剂改性方法及材料对水玻璃粘结剂的改性效果;分析了水玻璃的改性机制。试验结果表明,超声处理虽然提高了水玻璃砂的常温强度,却也恶化了溃散性;水玻璃经过纳米氧化物粉末改性后,适量纳米氧化物粉末可以在一定程度上改善水玻璃砂的溃散性,但常温强度却不能得到较大幅度的提高,作者开发的复合改性剂,既可提高水玻璃砂的常温强度,又可改善水玻璃砂的溃散性。借助XPS和SEM微观分析的方法,探讨了水玻璃粘结剂改性方法及材料对水玻璃粘结剂的改性机理。

Effect of Typical Modification Methods and Materials on Sodium Silicate Binder and Mechanism

The modified effects of several typical modification methods and materials such as ultrasonic processing,modified nano-powder,and compound modifier on sodium silicate binder were studied and their mechanisms were analyzed.The experimental results show that ultrasonic processing can improve the strength of sodium silicate bonded sand at room temperature,but deteriorate its collapsibility.While the collapsibility of sodium silicate treated by appropriate modified nano oxide powder can improve to some extent,the strength of the sand at room temperature has not improved significantly.However the compound modifier can improve both the strength of sodium silicate bonded sand at room temperature and its collapsibility as well.The mechanism of the modification methods and materials was discussed and analyzed using XPS and SEM.