| 摘要 |
A process of forming a refractory shape, comprising: (a) providing a castable slip; (b) casting said slip into a plaster of paris casting mold so as to provide a green casting, wherein said mold has been treated by incorporating into the plaster of paris mold mix 0.1 to 4.0% by weight of an organic polymer in the form of an aqueous solution thereof; (c) decomposing said mold to facilitate removal therefrom of said green casting, said decomposing being such that said mold containing a green casting is sufficiently heated in an oxygen containing atmosphere so as sufficiently to oxidise said polymer and thereby weaken said mold to permit ready removal of said green casting from said mold; and (d) removing said green casting from said decomposed mold. a |
