Porous metal body and process for producing same
US5625861A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1995 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | Oct 18, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2998/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The porous metal body of the inventtion has a porosity of 7 to 50%, pore sizes of 1 to 500 .mu.m and a pore distribution satisfying the relationship of: EQU (D.sub.95 -D.sub.5)/D.sub.50 .ltoreq.2.5 wherein D.sub.5 is the pore size on the cumulative distribution curve of the pore sizes at a cumulative frequency of 5%, D.sub.50 is the pore size on the curve at a cumulative frequency of 50% and D.sub.95 is the pore size on the curve at a cumulative frequency of 95%. The porous body is improved in porosity characteristics and mechanical strength. The porous metal body is prepared by pressing a metal powder to shape and sintering the shaped body by hot isostatic pressing, or alternatively by enclosing a metal powder in a capsule, subjecting the encapsulated powder to a primary sintering treatment in an isostatic medium to form a primary sintered porous body and heat-treating the sintered body with the capsule removed or without removing the capsule.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.