Patent · US Expired

Cemented carbide insert with binder phase enriched surface zone

US6468680B1 · kind B1 · utility

16Cited by
11References
11Claims
0Family size

Assignee

Inventors

Key dates

Filing dateFeb 20, 2001
Grant dateOct 22, 2002
Priority date—
Expiry dateFeb 20, 2021

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T428/252
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

The present invention relates to a coated cemented carbide insert with a binder phase enriched surface zone. The WC-grains have an average grain size in the range 1.0-3.5 &mgr;m, preferably 1.3-3.0 &mgr;m and the number of WC-grains larger than 2 times the average grain size is less than 10 grains/cm2 measured on a representative polished section 0.5 cm2 large, preferably less than 5 grains/cm2, and the number larger than 3 times the average grain size is less than 5 grains/cm2, preferably less than 3 grains/cm2. The cemented carbide is made by powder metallurgical methods and is in particular characterized in that the cooling rate, CR, from the sintering temperature, ST, exhibits the relationship 10<CR&middot;(ST-1300)/1000<17.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.