Process for providing a uniform carbon distribution in ferrous compacts at high temperatures
US4436696A · kind A · utility
4Cited by
7References
8Claims
0Family size
Assignee
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Key dates
| Filing date | May 20, 1981 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | May 20, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F3/1007
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for high temperature sintering of ferrous powder metallurgy compacts having a substantially uniform carbon distribution which comprises: PA1 (a) heating the ferrous powder metallurgy compact in the heating zone of a sintering furnace to a temperature of about 2,300.degree. to 2,550.degree. F. (1,260.degree. to 1,399.degree. C.), PA1 (b) introducing to the heating zone an atmosphere comprising about 2 to less than 10 volume percent hydrogen, about 0.5 to 2.0 volume percent carbon monoxide, about 0.5 to 1.0 volume percent methane and the balance nitrogen, and PA1 (c) removing the sintered product from the furnace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.