Method of controlling the dimensional change when sintering an iron-based powder mixture
US7329380B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 2003 |
| Grant date | Feb 12, 2008 |
| Priority date | — |
| Expiry date | May 12, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2999/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention concerns a method of controlling the dimensional change to a predetermined value including the steps of providing a first powder (A) consisting of an iron based powder (1) and copper in the form of elemental copper (2), or copper diffusion-bonded to the iron-based powder (3); providing a second powder (B) consisting of the iron-based powder (1) and a pre-alloyed iron-copper powder (4); mixing the first and second powder mixtures (A) and (B) in proportions resulting in the desired dimensional change adding graphite and lubricant and optionally hard phase materials and other alloying elements to the obtained mixture; compacting the obtained mixture; and sintering the compacted body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.