Composite ceramic composition and method of forming same

Patent metadata

Field	Value
Publication number	US-2017260102-A1
Application number	US-201515529847-A
Country	US
Kind code	A1
Filing date	Nov 23, 2015
Priority date	Nov 26, 2014
Publication date	Sep 14, 2017
Grant date	—

Abstract

A composite ceramic composition including a boron carbide phase and a method of forming the same. The composite ceramic composition includes a tungsten boride phase, a transition metal boride phase. The composite ceramic composition may also include a carbon disposed in solid solution with at least the tungsten boride phase and the transition metal boride phase. The transition metal boride phase may include a boride of at least one metal chosen from Cr, Nb, and Zr.

First claim

1 . A composite ceramic composition comprising:
a boron carbide phase; a tungsten boride phase; and a transition metal boride phase comprising a boride of at least one metal chosen from Cr, Nb, and Zr.

2 . The composition of claim 1 , wherein the transition metal boride phase comprises borides of at least two metals chosen from Cr, Nb, Ti, and Zr.

3 . The composition of claim 1 , further comprising carbon disposed in solid solution with at least one of the boron carbide phase, the tungsten boride phase, and the transition metal boride phase.

4 . The composition of claim 1 , wherein the transition metal boride phase comprises at least one phase chosen from a CrB 2 phase, a Ti 0.5 Zr 0.5 B 2 phase, and an NbTiB 4 phase.

5 . The composition of claim 1 , wherein the boron carbide phase comprises at least one phase chosen from a B 12 (BC 2 ) phase and a B 11.72 C 3.28 phase.

6 . The composition of claim 1 , wherein the tungsten boride phase comprises at least one phase chosen from a W 2 B 5 phase and a WB 2 phase.

7 . The composition of claim 1 , wherein the composition comprises a boron to carbon molar ratio ranging from about 2:1 to about 8:1.

8 . The composition of claim 1 , wherein the composition comprises a transition metal to carbon molar ratio of from about 0.5:1 to about 4:1.

9 . The composition of claim 1 , wherein the composition has:
a Vickers hardness ranging from about 14 to about 30 GPa at 1 kgf; and a toughness ranging from about 3 to about 10 MPa*m 0.5 .

10 . The composition of claim 1 , wherein the composition has a wear resistance factor ranging from about 14 to about 30 (K IC 3/4 *H 1/2 ).

11 . The composition of claim 1 , wherein the carbon comprises graphite.

12 . The composition of claim 1 , wherein the carbon is free of graphite.

13 . The composition of claim 1 , wherein the transition metal boride phase comprises a solid solution of chromium boride and titanium boride.

14 . The composition of claim 1 , wherein the composition has an electrical conductivity ranging from about 100 to about 300 S/m.

15 . The composition of claim 1 , wherein the composition has a thermal conductivity ranging from 5 to 50 W/(*K).

16 .- 17 . (canceled)

18 . The method of claim 1 , further comprising:
a solid solution comprising titanium, tungsten, boron, carbon, and compounds thereof, and at least one metal chosen from niobium, chromium, and zirconium;

19 . The composition of claim 18 , wherein the carbon is disposed in solid solution with at least one of the boron carbide phase, the tungsten boride phase, and the transition metal boride phase.

20 . The composition of claim 18 , wherein the transition metal boride phase comprises a boride of at least one metal chosen from Cr, Nb, and Zr.

21 . A composite ceramic composition comprising:
about 3.7 to about 9.3 mol % Ti; about 4.9 to about 12.3 mol % W; about 59.0 to about 71.9 mol % B; about 10.1 mol % to about 16.7 mol % C; and at least one additional component chosen from Nb, Cr, and Zr, wherein a total amount of the Ti, W, Nb, Cr, B, Zr, and C is at least 95 mol %.

22 . A composite ceramic composition comprising:
about 3.7 to about 9.3 mol % Ti; about 4.9 to about 12.3 mol % W; about 59.0 to about 71.9 mol % B; about 10.1 mol % to about 16.7 mol % C; and at least one additional component chosen from:
about 2.5 mol % Nb;
about 10.3 mol % Cr; and
about 2.5 mol % Zr,
wherein a total amount of the Ti, W, Nb, Cr, B, Zr, and C is at least 95 mol %.

23 .- 26 . (canceled)

Assignees

• Corning Inc

Inventors

• Conway Bethany Rose
• Zimmermann James William

Classifications

• C04B35/563 Primary

  based on boron carbide · CPC title

• C04B2235/3821

  Boron carbides · CPC title

• C04B35/6261

  Milling · CPC title

• C04B2235/6567

  Treatment time · CPC title

• C04B2235/602

  Making the green bodies or pre-forms by moulding · CPC title