Multi-phasic ceramic composite

Patent metadata

Field	Value
Publication number	US-10189746-B2
Application number	US-201715588562-A
Country	US
Kind code	B2
Filing date	May 5, 2017
Priority date	May 5, 2016
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A ceramic composite can include a first ceramic phase and a second ceramic phase. The first ceramic phase can include a silicon carbide. The second phase can include a boron carbide. In an embodiment, the silicon carbide in the first ceramic phase can have a grain size in a range of 0.8 to 200 microns. The first phase, the second phase, or both can further include a carbon. In another embodiment, at least one of the first ceramic phase and the second ceramic phase can have a median minimum width of at least 5 microns.

First claim

What is claimed is:

1. A ceramic composite comprising:
a first ceramic phase comprising grains of a first ceramic material; and
a second ceramic phase comprising grains of a second ceramic material;
wherein:
the first ceramic material has a different composition than the second ceramic material;
at least one of the first ceramic phase and the second ceramic phase has a median minimum width of at least 5 microns; and
the first phase, second phase, or both, includes grains of element carbon, wherein the elemental carbon is in an amount of at most 7 wt %, based on a total weight of the respective phase or phases.

2. The ceramic composite of claim 1 , the first ceramic material includes silicon carbide grains having an average grain size in a range of 0.3 to 200 microns.

3. The ceramic composite of claim 1 , wherein the second ceramic material comprises boron carbide grains having an average grain size in a range of 0.3 microns to 100 microns.

4. The ceramic composite of claim 1 , wherein the ceramic composite is a diphasic composite.

5. The ceramic composite of claim 1 , wherein the first and second ceramic phases have a 3-3 connectivity pattern, a 1-3 connectivity pattern, or both.

6. The ceramic composite of claim 1 , wherein the first ceramic material comprises silicon carbide including αSiC, 15R—SiC, 3C—SiC, or any combination thereof.

7. The ceramic composite of claim 1 , wherein the ceramic composite has a modulus of elasticity of at least 350 GPa and at most 500 GPa.

8. The ceramic composite of claim 1 , wherein the ceramic composite has an average bulk density of at least 2.4 g/cm 3 and at most 3.1 g/cm 3 .

9. The ceramic composite of claim 1 , wherein the ceramic composite has an average porosity of at most 5%.

10. An armor component comprising a ceramic body including the ceramic composite of claim 1 and a first component adjacent the ceramic body.

11. A ceramic composite comprising:
a first phase comprising grains of a silicon carbide having an average grain size in a range of 0.3 to 200 microns and grains of an elemental carbon having an average grain size in a range of 0.5 to 100 microns; and
a second phase comprising grains of a boron carbide and grains of an elemental carbon, the grains of the elemental carbon having an average grain size in range of 0.5 to 100 microns.

12. The ceramic composite of claim 11 , wherein the second phase comprises the grains of the boron carbide having an average grain size of 0.3 to 100 microns.

13. The ceramic composite of claim 11 , wherein the first phase, second phase, or both, has a median minimum width in a range of 5 to 200 microns.

14. The ceramic composite of claim 11 , wherein silicon carbide is present in an amount of at least 1 wt % and at most 99 wt % for a total weight of the ceramic composite.

15. The ceramic composite of claim 11 , wherein boron carbide is present in an amount of at least 1 wt % and at most 99 wt % for the total weight of the ceramic composite.

16. The ceramic composite of claim 11 , further comprising a ratio of weight percentage of silicon carbide for a total weight of the ceramic composite to a weight percentage of boron carbide for the total weight of the ceramic composite in a range of 1:99 to 99:1.

17. The ceramic composite of claim 11 , wherein the first phase comprises silicon carbide in an amount of at least 86 wt % and at most 99.9 wt %, based on a total weight of the first phase.

18. The ceramic composite of claim 17 , wherein the first phase further comprises grains of boron carbide.

19. The ceramic composite of claim 11 , wherein the second phase comprises boron carbide in an amount of at least 86 wt % and at most 99.9 wt %, based on a total weight of the second phase.

20. The ceramic composite of claim 19 , wherein the second phase further comprises grains of silicon carbide, wherein the grains of the silicon carbide of the first phase is separated from grains of the silicon carbide of the second phase.

Assignees

• Saint Gobain Ceramics

Inventors

• Tierney Diana R
• CREEDON Matthew
• Trunzo Tom J
• Delahunty Kenneth R

Classifications

• C04B2237/365

  Silicon carbide · CPC title

• C04B2235/5436

  micrometer sized, i.e. from 1 to 100 micron · CPC title

• C04B38/0051

  characterised by the pore size, pore shape or kind of porosity · CPC title

• C04B2235/786

  Micrometer sized grains, i.e. from 1 to 100 micron · CPC title

• C04B2235/5445

  submicron sized, i.e. from 0,1 to 1 micron · CPC title