Chromium boron surfaced nickel-iron base alloys
US4485148A · kind A · utility
11Cited by
9References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1983 |
| Grant date | Nov 27, 1984 |
| Priority date | — |
| Expiry date | Jul 8, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12854
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Chromium boron diffusion coatings on nickel iron alloys uniquely provide them with improvement in high cycle fatigue strength (up to 30%) and erosion resistance (up to 15 times), compared to uncoated alloy. The diffused chromium layer extends in two essential concentration zones to a total depth of about 40.times.10.sup.-6 m, while the succeeding boron layer is limited to 50-90% of the depth of the richest Cr layer nearest the surface. Both coatings are applied using conventional pack diffusion processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.