Chromium-base coating for wear-resistant steel and method of preparing same
US4469532A · kind A · utility
Inventor
Key dates
| Filing date | Sep 30, 1982 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Sep 30, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C12/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention concerns an abrasion resistent coating for steel and a method which makes it possible to obtain such a coating. The coating comprises two surface layers. The first surface layer, the outer layer, is formed of the phase (Cr, Fe).sub.2 B and possibly the phase M.sub.23 C.sub.6, while the second surface layer, the inner one, is formed of the phase (Fe, Cr).sub.2 B. In order to obtain this coating, a boriding is effected on steels at a temperature less than or equal to 950.degree. C. for a period of time greater than or equal to four hours, followed by a chromizing at a temperature less than or equal to 950.degree. C. for a period of time greater than or equal to 10 hours. Application to all steels in order to increase their resistance to wear is possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.