目前,越来越多的厂家使用珍珠岩作铁水的除渣、保温剂。使用中发现:珍珠岩撒在铁水表面后,接触铁水的部分在高温作用下熔融膨化,而上层珍珠岩因温度低未熔融成为游离颗粒。时间延长,游离颗粒内水分剧烈膨化,产生蹦跳现象,浇注时容易随铁水流入型腔。生产球铁件多采用开放式浇注系统,故铸件易产生夹珍珠岩缺陷。 At present, more and more manufacturers use perlite as hot metal slag, insulation agent. In use, it was found that after pearlite was sprinkled on the surface of the molten iron, the part that contacted the molten iron melted and expanded under high temperature, while the upper perlite did not melt due to the low temperature to become free particles. As time goes by, the water in the free particles is greatly puffed, resulting in bouncing. When pouring, it easily flows into the cavity with molten iron. The production of ductile iron pieces using open casting system, it is easy to produce pearl clip perlite defects.