铸钢用水基高铬刚玉消失模涂料试验研究

初步试验了一种以高铬刚玉砂粉为耐火骨料,钠基膨润土作悬浮剂,糖浆作粘结剂、有机纤维作透气材料的用于铸钢件的水基消失模涂料.有机纤维在骨料颗粒之中均匀分散之后,起到搭建立体网架作用,使骨料颗粒均匀附着在纤维网架上,避免颗粒过于密集,有助于涂料透气性的提高,3%的有机纤维能将透气值从200提高到400;糖浆其粘结效果较好,浇注时在高温下烧失,也增加涂层的透气性;高铬刚玉骨料具有良好的防粘砂效果,但剥离性稍差.

Research on Water Based Coating with High Chrome Corundum for Steel Castings of EPC

A water base EPC coating for steel casting is tested,which is made up of the refractory of high chrome corundum,the suspending agent of Na bentonite,the binder of syrup and the permeable material of organic fibre.It is demonstrated that a net structure could be shaped when organic fibre is added and dispersed evenly in the coating.The permeability of the coating is raised by keeping a certain distance within the refractory grains and the value of permeability raised from 200 to 400 by 3% of organic fibre.It has been proved that syrup has excellent bonding effect and also is helpful to improvee permeability by burning itself out when it contacts liquid steel and high chrome corundum has good ability of preventing steel penetration.However,the coating is difficult to be peeled off the surface of castings because of adhering power of chrome corundum.