Method for the production of precision shapes
US4212669A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1978 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | Aug 3, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F3/1266
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing precision shapes which includes the consolidation of powder metal preforms into a shaped porous preform. A first coating is applied to the preform, this first coating being porous while providing a diffusion barrier. A second coating which is also initially porous is then applied and the coated preform can then be degasified by subjecting the preform to a vacuum, particularly at elevated temperatures. The coated preform is then heated under vacuum to a temperature such that the second coating is densified to the extent that it becomes non-porous. Finally, the preform is subjected to a hot isostatic pressing operation whereby formation of high integrity, fully dense metal shape results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.