Cemented carbide articles and applications thereof

Patent metadata

Field	Value
Publication number	US-9725794-B2
Application number	US-201414573893-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Dec 17, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

In one aspect sintered cemented carbide articles are described herein which, in some embodiments, exhibit enhanced resistance to wear and thermal fatigue. Further, sintered cemented carbide articles described herein can tolerate variations in carbon content without formation of undesirable phases, including eta phase and/or free graphite (C-type porosity). Such tolerance can facilitate manufacturing and use of carbide grades where carbon content is not strictly controlled. A sintered cemented carbide body described herein comprises a hard particle phase including tungsten carbide and a metallic binder phase comprising at least one of cobalt, nickel and iron and one or more alloying additives, wherein the sintered cemented carbide has a magnetic saturation (MS) ranging from 0% to 73% and no eta phase.

First claim

The invention claimed is:

1. A sintered cemented carbide article comprising:
a hard particle phase including tungsten carbide, wherein the hard particle phase is carbon deficient; and
a metallic binder phase comprising at least one of cobalt, nickel and iron and one or more metallic alloying additives, wherein the sintered cemented carbide article has a magnetic saturation (MS) ranging from 0% to 73% and no eta phase.

2. The sintered cemented carbide article of claim 1 , wherein the hard particle phase further comprises carbide, nitride or carbonitride of one or more metals selected from Group IVB, VB or VIB of the Periodic Table.

3. The sintered cemented carbide article of claim 2 , wherein the hard particle phase comprises at least one of tantalum carbide, niobium carbide, vanadium carbide, chromium carbide, zirconium carbide, hafnium carbide, titanium carbide and solid solutions thereof.

4. The sintered cemented carbide article of claim 1 , wherein the alloying additive comprises one or more metallic elements.

5. The sintered cemented carbide article of claim 4 , wherein the metallic elements are transition metals.

6. The sintered cemented carbide article of claim 5 , wherein the transition metals are selected from Groups IIIB-VIIIB of the Periodic Table.

7. The sintered cemented carbide article of claim 6 , wherein the transition metals are selected from the group consisting of tungsten, ruthenium, manganese, copper, rhenium, chromium, osmium and molybdenum.

8. The sintered cemented carbide article of claim 1 , wherein the alloying additive is present in an amount up to 50 wt. % of the metallic binder phase.

9. The sintered cemented carbide article of claim 8 , wherein the alloying additive comprises ruthenium.

10. The sintered cemented carbide article of claim 1 , wherein the MS ranges from 5% to 65%.

11. The sintered cemented carbide article of claim 1 , wherein the MS ranges from 40% to 65%.

12. The sintered cemented carbide article of claim 1 , wherein the metallic binder is present in an amount of 1 to 30 wt. % of the sintered cemented carbide article.

13. The sintered cemented carbide article of claim 1 , wherein carbon content of the hard particle phase of the sintered cemented carbide article is 82% to 99.5% of stoichiometric carbon content for the hard particle phase of the sintered cemented carbide article.

14. The sintered cemented carbide article of claim 1 , wherein carbon content of the hard particle phase of the sintered cemented carbide article is 90% to 98% of stoichiometric carbon content for the hard particle phase of the sintered cemented carbide article.

15. The sintered cemented carbide article of claim 1 further comprising a metallic binder enriched zone at a surface of the article.

16. The sintered cemented carbide article of claim 1 , wherein the alloying additive is present in an amount of 30-50 wt. % of the metallic binder phase.

17. The sintered cemented carbide article of claim 1 , wherein the hard particle phase has an average grain size of 0.5 μm to 3 μm.

18. The sintered cemented carbide article of claim 1 , wherein the MS ranges from 3% to 73%.

Assignees

• Kennametal Inc

Inventors

• Trivedi Pankaj B
• Mehrotra Pankaj Kumar

Classifications

• C22C29/005

  comprising a particular metallic binder · CPC title

• B22F2005/001

  Cutting tools, earth boring or grinding tool other than table ware · CPC title

• C22C29/08 Primary

  based on tungsten carbide · CPC title

• C22C29/04

  based on carbonitrides · CPC title

• C22C29/067

  comprising a particular metallic binder · CPC title