Sintered member, pinion gear for starters, and production method therefor
US10213832B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2013 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | Dec 18, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19963
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides a sintered body and a production method therefor in which effects of pores remaining at a surface of the sintered body can be avoided without removing the pores by machining and plastic working, thereby obtaining strength equivalent to that of ingot materials. The sintered member comprises: a hardness distribution in which hardness contiguously varies from a surface to an inner portion; a Vickers hardness value of 730 or less at the surface; the maximum hardness of which portion exists in a region of 150 to 300 μm from the surface; wherein the maximum hardness is a Vickers hardness value of 600 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.