Variable density article and method for producing same
US4830822A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1987 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Oct 26, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12458
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for providing an article having within its integral body a plurality of sections of varying density. The method involves successively loading a die with each of a plurality of powders, each powder having a specific composition and particle size and each powder being loaded in a predetermined amount to result in each section of the final article having a characteristic density, compacting the powders to produce a preformed article, and sintering the preformed article at a sufficient temperature for a sufficient time to produce the final article. A method is disclosed in which the powders are metal. A metal article is disclosed which is produced the above methods, with the preferred metals being tungsten powder and molybdenum powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.