Surface refined sintered alloy and process for producing the same and coated surface refined sintered alloy comprising rigid film coated on the alloy
US4963321A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Oct 19, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There are disclosed a surface sintered alloy with a burnt surface, comprising 75 to 95% by weight of a hard phase containing Ti, C and N as the essential components and otherwise comprising at least one of Zr, Hf, V, Nb, Ta, Cr, Mo and W and the balance of the alloy comprising a binder phase composed mainly of Co and/or Ni and inevitable impurities, wherein the sintered alloy satisfies at least one condition selected from the group consisting of the following (1) to (3): PA1 (1) the average grain size of the hard phase in a surface layer to the inner portion of 0.05 mm from the burnt surface of the sintered alloy is 0.8 to 1.2-fold of the average grain size of the hard phase in the inner portion of the sintered alloy excluding the surface layer; PA1 (2) the average content of the binder phase in the surface layer to the inner portion of 0.05 mm from the burnt surface of the sintered alloy is 0.7 to 1.2-fold of the average content of the binder phase in the inner portion of the sintered alloy; and PA1 (3) the average hardness in the surface layer to the inner portion of 0.05 mm from the burnt surface of the sintered ally is 0.95 to 1.10-fold of the average hardness in the inner port…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.