Method of treating the surface of iron alloy materials
US4765847A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1987 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | Feb 3, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C16/36
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A layer of a nitride or carbonitride containing at least one of chromium, Group Va elements, titanium and zirconium is formed on the surface of an iron alloy material which has been nitrided. The layer is formed by heating the iron alloy material at a temperature not exceeding 700.degree. C. with a material containing at least one of chromium, Group Va elements, titanium and zirconium and a treating agent. It is a dense layer bonded tightly to the iron alloy material. As a low temperature not exceeding 700.degree. C. is employed, no large amount of heat energy is required, nor is any thermal strain produced in the iron alloy material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.