· Composites ·
Y Tomita *, H Sumimoto * , K Nakamura ** and S kiguchi *
* Kinki University, JAPAN, ** Honorary Professor of Kinki University, Japan
67th World Foundry Congress
The largest problem in compo-casting method is cracking caused by
thermal shock. Although this cracking can be prevented by reducing the
thermal stress by preheating the ceramics, the necessary preheating
temperature is high and its precise control is difficult at practical foundries.
In this study, we tried to estimate numerically the critical preheating
temperature of ceramics using a thermal stress analysis during transient
thermal conduction and Newman\'s diagram. We also found that
preheating of the ceramics to reduce thermal stress can be replaced by
placing appropriate cast iron covers around the ceramics.
We describe a new compo-casting method that needs no preheating of the
ceramics and has been prove useful experimentally. Also, a strength
evaluation of the compo-casting material was done.
