Abstract
It is known that special ceramics containing alumina cement can be enveloped soundly with molten metal and kept under shrink-fit condition. In this report, the internal stress of ceramics-enveloped casting which is a very important factor in terms of durability was investigated by X-ray and strain gauge methods. The stress on the metal surface of cylindrical test specimen which enveloped ceramics with spheroidal graphite cast iron had a tension of 1.33kg/mm2. The contact pressure on the boundary between metal and ceramics, which is the shrink-fit force was calculated to be 0.23kg/mm2 and the stress on the ceramics surface be a compression of 1.28kg/mm2. It was also made clear that the shrink-fit force is affected by the casting condition and increases 3 times by strengthening the restriction of the mold and increases 1.7 times by coating the outside surface of the ceramics.
