DUCTILE EMBEDMENT IN BRITTLE METAL PARTS

摘要

A cast pulverizer grinding ring made of cast brittle, white-cast iron has in creased resistance to failure by being provided with a mechanically intricate, light weight ductile material system embedded in the brittle metal. The surface of the embedded material i s coated, prior to casting, with a slurry of magnesium oxide particles in an alcohol vehicle to gether with a small amount of Bentonite particles (siliceous clay) and heat cured organic binder which resists attack by the molten metal and which avoids strong bonding with the solidified cast metal. The ductile embedment itself is a lightweight structure advantageously expanded metal. T he intimate contact between the ductile embedment and the cast metal provides structural support while the lack of a strong bond between the ductile embedment and the cast iron allows an elastic/plastic deformation of the ductile steel forming the embedment to differ from that o f the white-iron material cast therearound. The embedded ductile material holds the grinding ring together even if a through crack occurs.