Composite ceramic composition and method of forming same

Patent metadata

Field	Value
Publication number	US-10252946-B2
Application number	US-201515529847-A
Country	US
Kind code	B2
Filing date	Nov 23, 2015
Priority date	Nov 26, 2014
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

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

What is claimed is:

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

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 transition metal to carbon molar ratio of from about 0.5:1 to about 4:1.

8. 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 .

9. 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 ).

10. The composition of claim 3 , wherein the carbon disposed in solid solution comprises graphite.

11. The composition of claim 3 , wherein the carbon disposed in solid solution is free of graphite.

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

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

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

15. The composition 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.

16. The composition of claim 15 , 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.

17. 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 %.

18. 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 %.

19. The composition of claim 2 , wherein a total amount of the Ti, W, Nb, Cr, B, Zr, and C is at least 95 mol %.

Assignees

• Corning Inc

Inventors

• Conway Bethany Rose
• Zimmermann James William

Classifications

• C04B35/645

  Pressure sintering · CPC title

• C04B2235/3821

  Boron carbides · CPC title

• C04B2235/3813

  Refractory metal borides · CPC title

• H01B1/04

  mainly consisting of carbon-silicon compounds, carbon or silicon · CPC title

• C04B35/58064

  based on refractory borides · CPC title