Process for making a composite powder metallurgical billet
US4602952A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1985 |
| Grant date | Jul 29, 1986 |
| Priority date | — |
| Expiry date | Apr 23, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F7/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for producing a composite billet employing powder metallurgical techniques in which a first alloy powder of a preselected composition is compacted in a tubular container producing a preliminarily compacted tubular mass which thereafter is finished on the interior surface thereof to desired final dimensions. The resultant tubular mass is placed in a second container and the core thereof is filled with a powder of a desired second alloy composition and the contents are sealed. The second alloy powder is subsequently hot compacted to a density approaching 100 percent theoretical density without incurring any appreciable distortion or dimensional change of the tubular mass. Thereafter, the preliminary composite compacted billet is subjected under elevated temperature to an axial extrusion step producing a final composite extruded billet having a concentric outer layer of a first alloy and an inner core layer of a second alloy metallurgically bonded together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.