Mechanical seal using pore-dispersed material, and pore-dispersed cemented carbide and method for manufacturing same
US4925490A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 15, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Dec 15, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B38/0051
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A mechanical seal is, at a sliding surface and at its vicinity, formed of a pore-dispersed cemented carbide, so that the lubricating characteristics can be improved and the strength maintained by strictly stipulating the magnitude, shape, and volumetric ratio of the pores, such that pores are contained in an amount of 0.5 to 20 volume %, formed in at least one shape selected from the group of a substantially spherical shape and a substantially cylindrical shape, the pores in the substantially spherical shape having an average diameter of 3 to 20 .mu.m, the pores in the substantially cylindrical shape having an average diameter of 3 to 20 .mu.m and an average length in the range from the average diameter up to 300 .mu.m, and that the pores are prevented from linking to each other to give a length greater than 2 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.