| 摘要 |
PURPOSE:To obtain a jig for glass forming excellent in mold release property, lubricating property and mechanical strength by etching a molding containing >=5% boron nitride and having prescribed shape and selectively exposing boron nitride. CONSTITUTION:A mixture consisting of >=5wt.% BN and the balance Si3N4 is pressed and fired to afford a molding having prescribed shape, to which is then subjected to etching with fluorine to dissolve Si3N4 and selectively expose BN. Thereby the objective jig for glass forming excellent in mold release property, lubricating property and mechanical strength is obtained. |
