Heavy tungsten-nickel-iron alloys with very high mechanical characteristics
US4960563A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1990 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Mar 7, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/18
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a process for the production of a heavy tungsten-nickel-iron alloy with high mechanical characteristics comprising the steps of using powders of each of the elements of a FISHER diameter between 1 and 15 .mu.m, mixing the powders in proportions corresponding to the composition of the desired alloy, compressing the powders in the form of compacted items, sintering the compacted items at a temperature of between 1490 and 1650.degree. C. for 2 to 5 hours, treating the sintered compacted items under vacuum at between 1000.degree. and 1300.degree. C., and subjecting the compacted items after treatment under vacuum to at least three cycles of operation, each cycle comprising a working step followed by a heat treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.