专利名称：Method and apparatus for directional
solidification
申请号：US51188574申请日：19741003公开号：USB511885I5公开日：19760127
摘要：In making columnar grained castings the shell mold is spaced from the chillplate by a ceramic ring on which the mold is positioned, the ring being made thickerand/or of a different ceramic from the mold to withstand the thermal stress developingwhile the mold is being heated for pouring, so that the mold, not being subjected to suchstresses at the base, may be made thinner for producing better castings. In this way thebest mold material for the purpose may be selected, as, for example, a material to haveno reaction with the alloy and, by lowering the thermal gradient decrease the likelihoodof mold failure.
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