论文部分内容阅读
针对微波加热硬化水玻璃砂吸湿性强的特点,以PbO-ZnO系低温玻璃粉作为主要的涂层材料,研究测试了涂层的抗湿性.结果表明:表面涂层后的水玻璃砂样抗吸湿性明显高于普通水玻璃砂样,4h存放强度提高了2.33倍,4h吸水率降低了45.9%.通过SEM和XRD等测试方法,对表面涂层砂样和普通砂样的物相和成分进行了分析:SEM分析表明,表面涂层砂样的表层有涂层材料渗入形成防湿层,防湿层内砂粒表面的粘结桥有许多细小颗粒状物质分布.表面XRD扫描表明:涂层表面出现了3种新的物相,即Al2TiO5,NaAlO2和PbTiO3,它们是表面涂层提高砂样抗湿性的主要原因.
Aiming at the strong hygroscopicity of microwave heating hardened sodium silicate sand, PbO-ZnO low temperature glass powder is the main coating material, and the moisture resistance of the coating is tested. The results show that the surface coating of water glass sand sample The hygroscopicity was obviously higher than that of common water glass sand samples, the storage strength increased by 2.33 times in 4h, and the water absorption in 4h decreased by 45.9%. Through the SEM and XRD test methods, the phase and composition of surface coating sand samples and common sand samples The SEM analysis shows that the surface of the coating sand sample has the coating material infiltrating to form a moisture-proof layer, and many fine granular substances are distributed on the binder bridge of the sand surface in the moisture-proof layer.The surface XRD scan shows that the coating surface appears Three new phases, Al2TiO5, NaAlO2 and PbTiO3, are the main reasons why surface coatings improve the moisture resistance of sand samples.