Compositional variations of tungsten tetraboride with transition metals and light elements

Patent metadata

Field	Value
Publication number	US-10731236-B2
Application number	US-201816142607-A
Country	US
Kind code	B2
Filing date	Sep 26, 2018
Priority date	Apr 22, 2011
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A composition includes tungsten (W); at least one element selected from the group of elements consisting of boron (B), beryllium (Be) and silicon (Si); and at least one element selected from the group of elements consisting of titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), zirconium (Zr), niobium (Nb), molybdenum (Mo), ruthenium (Ru), hafnium (Hf), tantalum (Ta), rhenium (Re), osmium (Os), iridium (Ir), lithium (Li) and aluminum (Al). The composition satisfies the formula W 1-x M x X y wherein X is one of B, Be and Si; M is at least one of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, Hf, Ta, Re, Os, Ir, Li and Al; x is at least 0.001 and less than 0.999; and y is at least 4.0. A tool is made from or coated with this composition.

First claim

We claim:

1. A method for preparing a composition comprising:
tungsten (W);
at least one element selected from the group of elements consisting of boron (B), beryllium (Be) and silicon (Si); and
at least one element selected from the group of elements consisting of titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), zirconium (Zr), niobium (Nb), molybdenum (Mo), ruthenium (Ru), hafnium (Hf), tantalum (Ta), osmium (Os), iridium (Ir), lithium (Li) and aluminum (Al);
wherein said composition satisfies the formula:
W 1-x M x X y

wherein X is B;
M is at least one of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, Hf, Ta, Os, Ir, Li and Al;
x is at least 0.001 and less than 0.999; and
y is at least 4.0;
the method comprising:
a) mixing together powders of W, X, and M to form a mixture;
b) optionally pressing the mixture into a pellet; and
c) heating the mixture or pellet,
wherein the composition is a crystalline solid characterized by at least one X-ray diffraction pattern reflection at 2 theta=24.2±0.2.

2. The method of claim 1 , wherein M is one of Ta, Mn, Cr, Ta and Mn, or Ta and Cr.

3. The method of claim 1 , wherein x is at least 0.001 and less than 0.6.

4. The method of claim 1 , wherein M is Ta, and x is at least 0.001 and less than 0.05.

5. The method of claim 1 , wherein M is Mn, and x is at least 0.001 and less than 0.4.

6. The method of claim 1 , wherein M is Cr, and x is at least 0.001 and less than 0.6.

7. The method of claim 1 , wherein mixing occurs under an inert atmosphere deficient in water, oxygen, carbon dioxide, and carbon monoxide.

8. The method of claim 1 , wherein the powders are mixed using a mortar and pestle or a mechanical mixer.

9. The method of claim 1 , wherein the mixture is pressed into a pellet using a hydraulic press.

10. The method of claim 1 , wherein the mixture is pressed into a pellet and heated using a hot press.

11. The method of claim 1 , wherein the mixture or pellet is heated by plasma spark sintering.

12. The method of claim 1 , wherein the mixture or pellet is heated in an arc melting furnace.

13. The method of claim 12 , wherein a current is applied across the mixture or pellet, wherein said current is an AC/DC current greater than 60 Amps.

14. The method of claim 1 , wherein the mixture or pellet is heated in an inert atmosphere deficient in water, oxygen, carbon dioxide, and carbon monoxide.

15. The method of claim 14 , wherein the mixture or pellet is heated in an argon or dinitrogen atmosphere.

16. The method of claim 1 , wherein the crystalline solid is further characterized by at least one X-ray diffraction pattern reflection at 2 theta=34.5±0.2 or 45.1±0.2.

17. The method of claim 1 , wherein the crystalline solid is further characterized by at least one X-ray diffraction pattern reflection at 2 theta=47.5±0.2, 61.8±0.2, 69.2±0.2, 69.4±0.2, 79.7±0.2, 89.9±0.2, or 110.2±0.2.

18. The method of claim 1 , wherein the crystalline solid is further characterized by at least five X-ray diffraction pattern reflections at 2 theta=28.1±0.2, 34.5±0.2, 42.5±0.2, 45.1±0.2, 47.5±0.2, 55.9±0.2, 61.8±0.2, 69.2±0.2, 69.4±0.2, 79.7±0.2, 89.9±0.2, or 110.2±0.2.

19. The method of claim 1 , wherein W, X, and M are powders of over 99% purity.

Assignees

• Univ California

Inventors

• Kaner Richard B
• Tolbert Sarah H
• Mohammadi Reza
• Lech Andrew T
• Xie Miao

Classifications

• C22C29/14

  based on borides · CPC title

• C22C27/04 Primary

  Alloys based on tungsten or molybdenum · CPC title

• B22F9/04

  starting from solid material, e.g. by crushing, grinding or milling ({C22C1/1084 takes precedence}; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C) · CPC title

• C23C30/005

  on hard metal substrates · CPC title

• B22F2005/001

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