Solid solution tungsten carbide powders and applications thereof

Patent metadata

Field	Value
Publication number	US-2025027189-A1
Application number	US-202318222730-A
Country	US
Kind code	A1
Filing date	Jul 17, 2023
Priority date	Jul 17, 2023
Publication date	Jan 23, 2025
Grant date	—

Abstract

An improved tungsten carbide powder comprises (W,Cr) C solid solution phase for oxidation resistance at high temperatures. The improved tungsten carbide powders may be formed by carburizing a mixture of tungsten powder, carbon powder, and Cr 2 O 3 powder. The tungsten carbide powder herein may be used to form ready-to-press (RTP) or grade powders. These RTP may be used to form articles, including articles that require excellent oxidation resistance at high temperature. One such component is a seal ring for a liquid battery.

First claim

1 . A tungsten carbide powder comprising a (W,Cr) C solid-solution phase.

2 . The tungsten carbide powder of claim 1 , comprising more than 1 wt. % chromium based on total weight of the powder.

3 . The tungsten carbide powder of claim 1 , comprising at least 5 wt. % chromium based on total weight of the powder.

4 . The tungsten carbide powder of claim 1 , comprising at least 10 wt. % chromium based on total weight of the powder.

5 . The tungsten carbide powder of claim 1 having an average grain size of 0.4 μm to 10 μm.

6 . The tungsten carbide powder of claim 1 , wherein carbon is present in an amount of 1-10 weight percent of the powder.

7 . The tungsten carbide powder of claim 1 , wherein carbon is present in an amount of 5-10 weight percent of the powder.

8 . The tungsten carbide powder of claim 1 having the composition 5-15 weight percent chromium, 1-10 weight percent carbon, and the balance tungsten.

9 . A ready-to-press (RTP) powder comprising:
a tungsten carbide powder comprising a (W,Cr) C solid-solution phase. a metallic binder.

10 . The RTP powder of claim 9 , wherein the metallic binder is Fe, Co, Ni, or alloys thereof.

11 . The RTP powder of claim 9 , further comprising one or more additives.

12 . The RTP powder of claim 11 , wherein the one or more additives are selected from VC, Cr 3 C 2 , Re, Ru, MozC, and combinations thereof.

13 . The RTP powder of claim 11 , wherein the one or more additives comprise a grain growth inhibitor.

14 . A cemented carbide article formed from the RTP powder of claim 9 .

15 . The cemented carbide article of claim 14 , wherein the component is a seal for a liquid battery.

16 . A liquid battery comprising the component of claim 15 .

17 . A manufacturing method comprising:
carburizing a mixture of tungsten powder, carbon powder, and chromium oxide to form a tungsten carbide powder comprising a (W,Cr) C solid-solution phase, wherein the mixture comprises at least 1 wt. % of the chromium oxide.

18 . The manufacturing method of claim 17 , wherein the mixture comprises at least 5 wt. % of the chromium oxide.

19 . The manufacturing method of claim 17 , wherein the chromium oxide is Cr 2 O 3 .

20 . The manufacturing method of claim 17 , further comprising combining the tungsten carbide powder comprising the (W,Cr) C solid-solution phase with powder metallic binder and optional additives to provide a ready-to-press (RTP) powder.

21 . The manufacturing method of claim 20 , wherein the ready-to-press powder is used to form a cemented carbide article.

Assignees

• Kennametal Inc

Inventors

• Eso Oladapo O
• Brown Amanda

Classifications

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01B32/914

  Carbides of single elements · CPC title

• C01B32/949

  Tungsten or molybdenum carbides · CPC title

• C22C29/02

  based on carbides or carbonitrides · CPC title