Process for making a cemented carbide with binder phase enriched

Details Process for making a cemented carbide with binder phase enriched Process for making a cemented carbide with binder phase enriched

1996-03-15

1998-06-02

Mai, Ngoclan

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Post sintering operation

419 57, 419 60, C21D 100

Patent

active

057615934

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.

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