Grade powders and sintered cemented carbide compositions

Patent metadata

Field	Value
Publication number	US-2024207929-A1
Application number	US-202418595965-A
Country	US
Kind code	A1
Filing date	Mar 5, 2024
Priority date	Aug 11, 2017
Publication date	Jun 27, 2024
Grant date	—

Abstract

In one aspect, grade powder compositions are described herein comprising electrochemically processed sintered carbide scrap. In some embodiments, a grade powder composition comprises a reclaimed powder component in an amount of at least 75 weight percent of the grade powder composition, wherein the reclaimed carbide component comprises electrochemically processed sintered carbide scrap.

First claim

1 . A grade powder composition comprising:
a metallic binder; and a reclaimed carbide powder component in an amount of at least 70 weight percent of the grade powder composition, the reclaimed carbide component comprising electrochemically processed sintered carbide scrap in an amount of 40-99 wt. %, and a balance of other reclaimed sintered scrap.

2 . The grade powder composition of claim 1 , wherein the balance of other reclaimed sintered scrap comprises zinc processed sintered carbide scrap and/or ammonium paratungstate processed sintered carbide scrap.

3 . The grade powder composition of claim 1 , wherein the reclaimed carbide powder component is 90-99 wt. % of the grade powder composition.

4 . The grade powder composition of claim 1 , wherein the reclaimed carbide component comprises electrochemically processed sintered carbide scrap in an amount of 50 to 90 wt. %.

5 . The grade powder composition of claim 1 , wherein the reclaimed carbide component comprises electrochemically processed sintered carbide scrap in an amount of 50 to 85 wt. %.

6 . The grade powder composition of claim 2 , wherein the balance of other reclaimed sintered scrap comprises zinc processed sintered carbide scrap or zinc processed sintered carbide scrap and ammonium paratungstate processed sintered carbide scrap.

7 . The grade powder composition of claim 2 , wherein the balance of other reclaimed sintered scrap comprises ammonium paratungstate processed sintered carbide scrap, or ammonium paratungstate processed sintered carbide scrap and zinc processed sintered carbide scrap.

8 . The grade powder composition of claim 1 , wherein the electrochemically processed sintered carbide scrap comprises tungsten carbide.

9 . The grade powder composition of claim 8 , further comprising at least one metal carbide selected from the group consisting of Group IVB metal carbides, Group VB metal carbides, and group VI metal carbides.

10 . The grade powder composition of claim 1 , wherein the electrochemically processed sintered carbide scrap has an average particle size of 0.5 microns to 15 microns.

11 . The grade powder composition of claim 1 , comprising no virgin tungsten carbide.

12 . A method of making a sintered cemented carbide article comprising:
providing the grade powder composition of claim 1 ; forming the grade powder composition into a green article; and sintering the green article to provide the sintered cemented carbide article.

13 . The method of claim 12 , wherein providing the grade powder composition comprises milling the reclaimed carbide component with the metallic binder.

14 . The method of claim 12 , wherein the sintered cemented carbide article has fracture toughness of 5-20 ksi(in 1/2 ).

15 . The method of claim 14 , wherein the sintered cemented carbide article has fracture toughness of 10-20 ksi(in 1/2 ).

16 . The method of claim 12 , wherein the sintered cemented carbide article has transverse rupture strength of 250-650 ksi.

17 . The method of claim 16 , wherein the sintered cemented carbide article has transverse rupture strength of 300-650 ksi.

18 . The method of claim 16 , wherein the sintered cemented carbide article has transverse rupture strength of 350-650 ksi.

19 . The method of claim 16 , wherein the sintered cemented carbide article has transverse rupture strength of 400-650 ksi.

20 . The method of claim 16 , wherein the sintered cemented carbide article has transverse rupture strength of 500-650 ksi.

Assignees

• Kennametal Inc

Inventors

• Mehrotra Pankaj K
• Trivedi Pankaj B
• Mizgalski Kent P

Classifications

• B22F1/148

  Agglomerating · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F9/026

  Spray drying of solutions or suspensions · CPC title

• B22F2009/001

  from scrap particles · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title