Titanium-based carbonitride alloy with controllable wear resistance and toughness

• US 6,129,891 A
• Filed: 08/23/1999
• Issued: 10/10/2000
• Est. Priority Date: 01/20/1995
• Status: Expired due to Fees

• Current Assignee: Sandvik Intellectual Property AB (Sandvik AB)
• Original Assignee: Sandvik AB
• Inventors: Lindahl, Per, Rolander, Ulf, Andren, Hans-Olof, Weinl, Gerold
• Primary Examiner(s): MAI, NGOCLAN THI
• Application Number:
  US09/378,761
• Time in Patent Office: 414 Days
• Field of Search: 419/13, 419/16, 419/38
• US Class Current: 419/16
• CPC Class Codes: B22F 2005/001 Cutting tools, earth boring or grinding tool other than table ware
• CPC Class Codes: B22F 2207/07 Particles with core-rim gradient
• CPC Class Codes: B22F 2998/00 Supplementary information concerning processes or compositions relating to powder metallurgy
• CPC Class Codes: C22C 29/04 based on carbonitrides
• CPC Class Codes: C23C 30/005 on hard metal substrates

Abstract

The present invention relates to a sintered body of titanium-based carbonitride alloy comprising hard constituents containing at least tungsten in addition to titanium in a binder phase based on cobalt. There are four distinctly different microstructural components, namely: A) cores which are remnants of and have a metal composition determined by the raw material powder; B) tungsten-rich cores formed during the sintering; C) outer rims with intermediate tungsten content formed during the sintering; and D) a binder phase of a solid solution of at least titanium and tungsten in cobalt. Toughness and wear resistance are varied by adding WC, (Ti,W)C, and/or (Ti,W)(C,N) in varying amounts as raw materials.

Claims

1. A method of manufacturing a sintered body of titanium-based carbonitride alloy comprising hard constituents in a binder phase based on 8-15 at % cobalt, where the hard constituents contain at least tungsten in addition to titanium, optimizing the relation between toughness and wear resistance for a specific application by adding (Ti,W)C and/or (Ti,W)(C,N), pressing and sintering the resulting mixture.

2. The method of claim 1 wherein the amount of tungsten in atomic percent is from 4<

W/(W+Ti)<

30.

3. The method of claim 2 wherein the amount of nitrogen in atomic percent is from 20<

N/(N+C)<

60.

4. The method of claim 1 wherein up to 20 atomic percent of the tungsten is substituted by Mo.