熱応力を緩和させたセラミックスの鋳鉄による鋳ぐるみ

摘要

Compo-casting of ceramics and cast iron is expected to be one of the major casting technologies that can expand the application fields of cast iron. The largest problem in compo-casting technology is the generation of cracks caused by thermal shock. Although this crack generation can be prevented by reducing thermal stress by means of preheating ceramics, the necessary preheating temperature is considerably high and precise controlling is difficult at foundry working sites. In this study, we tried to numerically predict the critical preheating temperature of ceramics using thermal stress analysis in unsteady heat transfer and the Newman's diagram, and found that the preheating of ceramics to reduce thermal stress can be substituted with placing an appropriate cast iron cover around the ceramics. We introduce our newly developed compo-casting method which requires no preheating of ceramics with several experimental results of the method.