Compositional variations of tungsten tetraboride with transition metals and light elements

Patent metadata

Field	Value
Publication number	US-2019017154-A1
Application number	US-201816142607-A
Country	US
Kind code	A1
Filing date	Sep 26, 2018
Priority date	Apr 22, 2011
Publication date	Jan 17, 2019
Grant date	—

Abstract

A composition includes tungsten (W); at least one element selected form 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

1 .- 23 . (canceled)

24 . 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 at least 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, 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 elemental 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.

25 . The method of claim 24 , wherein X is B.

26 . The method of claim 24 , wherein M is one of Ta, Mn, Cr, Ta and Mn, or Ta and Cr.

27 . The method of claim 24 , wherein x is at least 0.001 and less than 0.6.

28 . The method of claim 24 , wherein X is B, M is Ta, and x is at least 0.001 and less than 0.05.

29 . The method of claim 24 , wherein X is B, M is Mn, and x is at least 0.001 and less than 0.4.

30 . The method of claim 24 , wherein X is B, M is Cr, and x is at least 0.001 and less than 0.6.

31 . The method of claim 24 , wherein mixing occurs under an inert atmosphere deficient in water, oxygen, carbon dioxide, and carbon monoxide.

32 . The method of claim 24 , wherein the elements are mixed using a mortar and pestle or a mechanical mixer.

33 . The method of claim 24 , wherein the mixture is pressed into a pellet using a hydraulic press.

34 . The method of claim 24 , wherein the mixture is pressed into a pellet and heated using a hot press.

35 . The method of claim 24 , wherein the mixture or pellet is heated by plasma spark sintering.

36 . The method of claim 24 , wherein the mixture or pellet is heated in an arc melting furnace.

37 . The method of claim 36 , wherein a current is applied across the mixture or pellet, wherein said current is an AC/DC current greater than 60 Amps.

38 . The method of claim 24 , wherein the mixture or pellet is heated in an inert atmosphere deficient in water, oxygen, carbon dioxide, and carbon monoxide.

39 . The method of claim 38 , wherein the mixture or pellet is heated in an argon or dinitrogen atmosphere.

40 . The method of claim 24 , wherein the composition is a crystalline solid characterized by at least one X-ray diffraction pattern reflection at 2 theta=24.2±0.2.

41 . The method of claim 40 , 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.

42 . The method of claim 40 , 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.

43 . The method of claim 40 , 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.

Assignees

• Univ California

Inventors

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

Classifications

• B22F2005/001

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

• C22C27/04 Primary

  Alloys based on tungsten or molybdenum · CPC title

• C22C29/14

  based on borides · CPC title

• C23C30/005

  on hard metal substrates · CPC title

• C22C1/045

  Alloys based on refractory metals · CPC title