| 摘要 |
PURPOSE:To obviate cracking in ceramics owing to insert casting by coating a compsn. consisting of refractory powder, binder, solvent and thermoplastic resin insoluble in the solvent on the surface of the ceramics/and evaporating the resin by heating to form a porous cushion material layer. CONSTITUTION:A compsn. consisting of refractory powder, binder, solvent and thermoplastic resin insoluble in the solvent is coated on the surface of a ceramics in contact with a molten metal and is heated to the temp. higher than the thermal decomposition temp. of the resin to evaporated the resin, thereby forming a porous cushion material layer which is then inserted by the molten metal. Water glass, colloidal silica, etc. are used for the binder and a solvent suitable for the binder used is used for the solvent. The binder and the solvent are used at about 10-15wt% in total. >=1 Kind among PP, PE, etc. are used at about 5- 40wt% for the thermopolastic resin/and the grain size thereof is made to about <=200mu. The thickness of the porous cusion material layer is made to about <=1/15 the wall thickness of the metal for insert casting. |
