Patent · US Expired

Process for making a cemented carbide with binder phase enriched surface zone

US5761593A · kind A · utility

11Cited by

11References

6Claims

0Family size

Assignee

SANDVIK AB · SE

Inventors

Ake Ostlund · Stuvsta-Snättringe, SE
Ulf Oscarsson · Tumba, SE
Per Gustafson · Huddinge, SE
Leif Akesson · Houjie, CN

Key dates

Filing date	Mar 15, 1996
Grant date	Jun 2, 1998
Priority date	—
Expiry date	Mar 15, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/26
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A cemented carbide insert with improved toughness and resistance against plastic deformation containing WC and cubic phases of carbide and/or carbonitride in a binder phase based on Co and/or Ni with a binder phase enriched surface zone is disclosed. The binder phase content in the insert is 3.5-12 weight-%. In a zone below the binder phase enriched surface zone, the binder phase content is 0.85-1 of the binder phase content in the inner portion of the insert and the content of cubic phases is essentially constant and equal to the content in the inner portion of the insert. The insert is formed by sintering a cemented carbide containing a nitrogen-containing material in a vacuum or inert atmosphere and heat treating the sintered insert in nitrogen at 40-400 mbar at a temperature of 1280.degree.-1430.degree. C. for a time of 5-100 min.

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