Die for press forming of glass and manufacturing method thereof
US8206518B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 2006 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Jan 18, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2215/16
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention is directed to provide a method for manufacturing a die for press forming of glass in which cracks are not easily caused in a surface covering layer. A surface covering layer made of an amorphous Ni—P alloy is formed on the surface of a base material made of a steel having a martensitic structure or made of steel in which ε-carbide is dispersed in low carbon martensite matrix. Then, the base material and the surface covering layer are heated to change the base material into a troostitic structure or a sorbitic structure and change the surface covering layer into a eutectic structure of Ni and Ni3P. Preferably, the base material contains 0.3 wt % or more and 2.7 wt % or less of carbon and 13 wt % or less of chromium, and the heat treatment is carried out at 270° C. or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.