Highly emissive space compatible material

Patent metadata

Field	Value
Publication number	US-10421900-B2
Application number	US-201514640441-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Apr 17, 2014
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

An emissive material includes a source of alumina in an amount between about 20 and about 30 weight % (wt. %), B 4 C in an amount between about 10 and about 20 wt. %, and SiC in an amount between about 55 and about 65 wt. %.

First claim

What is claimed is:

1. An emissive material, consisting essentially of:
a source of alumina in an amount between about 20 and about 30 weight % (wt. %);
B 4 C in an amount between about 10 and about 20 wt. %; and
SiC in an amount between about 55 and about 65 wt. %.

2. The emissive material of claim 1 , wherein the source of alumina is an aluminum oxide, an aluminum hydroxide, or any combination thereof.

3. The emissive material of claim 1 , wherein the source of alumina is Al 2 O 3 .

4. The emissive material of claim 1 , wherein the source of alumina is between about 22 and about 28 wt %.

5. The emissive material of claim 1 , wherein the B 4 C is in an amount between about 12.5 and about 17.5 wt. %.

6. The emissive material of claim 1 , wherein the SiC is in an amount in a range between about 58 and about 63 wt. %.

7. An emissive material, comprising:
a source of alumina in an amount between about 20 and about 30 weight % (wt. %);
B 4 C in an amount between about 10 and about 20 wt. %; and
SiC in an amount between about 55 and about 65 wt. %;
wherein the emissive material is a slip cast ceramic compound.

8. The emissive material of claim 7 ,
wherein the emissive material is a ceramic core material of a cryogenic vacuum instrument.

9. The emissive material of claim 8 , wherein the cryogenic vacuum instrument is an infrared source.

10. The emissive material of claim 8 , wherein the emissive material is a coating.

11. The emissive material of claim 10 , wherein the emissive material is bonded with a ceramic core material.

12. The emissive material of claim 8 , wherein the emissive material does not have substantial vaporization induced mass loss at a temperature up to 1000 Kelvin (K) and vacuum levels >1×10 −7 Torr.

13. The emissive material of claim 8 , wherein the emissive material has an emissivity greater than 0.95 in a wavelength region of 2 to 10 microns.

14. The emissive material of claim 8 , wherein the emissive material has a total reflectivity of less than 0.2 over a wavelength range of about 2 to about 15 microns.

15. The emissive material of claim 8 , wherein the emissive material is spectrally black over an infrared wavelength range.

16. A method of making an emissive material, the method comprising:
mixing between about 20 and about 30 wt. % of an alumina source, between about 10 and about 20 of B 4 C, between about 55 and about 65 wt. % SiC, and a surfactant in an aqueous solution to form a mixture; and
slip casting the mixture.

17. The method of claim 16 , further comprising heating the mixture in an inert gas to sinter the B 4 C and the SiC.

18. The method of claim 16 , wherein the source of alumina is an aluminum oxide, an aluminum hydroxide, or any combination thereof.

19. The method of claim 16 , further comprising disposing the mixture as a coating onto another ceramic material.

20. The method of claim 19 , further comprising heating the coating and ceramic material to form a substantially homogenous layer.

Assignees

• Raytheon Co

Inventors

• Burnes Clifford S

Classifications

• G01S3/7803

  Means for monitoring or calibrating · CPC title

• F41G7/004

  for infrared seekers · CPC title

• C09K11/655

  Aluminates; Silicates · CPC title

• C09K11/025 Primary

  non-luminescent particle coatings or suspension media · CPC title