消失模铸造水基涂料的研制

涂料是消失模铸造最关键的辅助材料之一。为降低消失模铸造涂料的成本，研制了水基消失模涂料。文中采用石英粉为耐火骨料，石英粉共有3种粒度分布。所有涂料用碾轮式混砂机制成膏状涂料，在搅拌机中加入适量水搅拌成液体涂料，然后测其性能。研制出的涂料，配方为：石英粉100％，膨润土4％，白乳胶2．5％，羧甲基纤维素钠（CMC）0．5％，以及其它附加物，其中石英粉要求粒度分布相对集中。该涂料成本低且具有优良的工艺性能，特别适用于球墨铸铁件的消失模铸造生产。

Development of Water Based Coating for Lost Foam Casting

The coating is one of the most important auxiliary materials of lost foam casting. In order to reduce the cost of coating for lost foam casting, water based coating has been developed. Refractory material of quartz sands that have three kinds of grain size distribution was used. All coatings were made into paste form by sand roller mill. The paste form was stirred into liquid coating by adding some water in stirrer, then measuring their properties. The developed coating has relative concentrated grain size distribution and consists of quartz sand 100%, bentonite 4%, polyvinyl acetate emulsision 2.5%, CMC 0.5% and other accessories. The coasting has low cost and excellent processing properties, which is applicable to produce nodular iron casting.