Method of forming a spectral selective coating

Patent metadata

Field	Value
Publication number	US-10201947-B2
Application number	US-201514824060-A
Country	US
Kind code	B2
Filing date	Aug 11, 2015
Priority date	Aug 12, 2014
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A method of forming a spectral selective coating is disclosed. The method may include providing particles on a substrate, wherein the particles include submicron particles. The method may farther include sintering the particles under atmospheric pressure to form a sintered layer an the substrate and texturing the sintered layer to provide a submicron surface roughness height on the sintered layer.

First claim

What is claimed is:

1. A method of forming a spectral selective coating, the method comprising:
providing particles on a substrate, wherein the particles include submicron particles;
sintering the particles under atmospheric pressure to form a sintered layer on the substrate; and
texturing the sintered layer to provide a submicron surface roughness height on the sintered layer.

2. The method of claim 1 , wherein sintering the particles includes at least one of laser sintering, solid state sintering, and liquid phase sintering.

3. The method of claim 2 , wherein laser sintering is performed with one of a high power direct diode laser, a solid state laser, a sealed CO2 laser, a fiber laser, and allowing gas CO2 laser.

4. The method of claim 1 , wherein the particles include particles having a dimension greater than or equal to one micron.

5. The method of claim 1 , wherein the particles comprise one or more of metal particles, tungsten, nickel, chromium, and steel.

6. The method of claim 1 , further including applying an antireflective coating on the sintered layer.

7. The method of claim 6 , wherein the antireflective coating is applied under atmospheric pressure.

8. The method of claim 1 , wherein the substrate is a metal substrate.

9. The method of claim 8 , wherein the substrate is a steel substrate.

10. A spectral selective coating, comprising:
a substrate; and
a sintered layer disposed on the substrate, the sintered layer being formed of particles sintered under atmospheric pressure, wherein:
the particles include submicron particles; and
the sintered layer is textured and has a submicron surface roughness height on the sintered layer.

11. The spectral selective coating of claim 10 , wherein the particles include particles having a dimension greater than or equal to one micron.

12. The spectral selective coating of claim 10 , wherein the particles comprise one or more of tungsten, nickel, chromium, and steel.

13. The spectral selective coating of claim 10 , further including an antireflective coating on the sintered layer.

14. The spectral selective coating of claim 10 , wherein the substrate is a metal substrate.

15. The spectral selective coating of claim 14 , wherein the substrate is a steel substrate.

16. A solar receiver comprising:
an absorber tube having an outer surface;
a spectral selective coating disposed on the outer surface of the absorber tube, wherein, the spectral selective coating includes:
a metal substrate; and
a sintered layer disposed on the metal substrate, the sintered layer being formed of particles sintered under atmospheric pressure, wherein:
the particles include submicron particles; and
the sintered layer is textured and has a submicron surface roughness height on the sintered layer.

17. The solar receiver of claim 16 , wherein the particles include particles having a dimension greater than or equal to one micron.

18. The solar receiver of claim 16 , wherein the particles comprise one or more of tungsten, nickel, chromium, and steel.

19. The solar receiver of claim 16 , further including an antireflective coating on the sintered layer.

20. The solar receiver of claim 16 , wherein the substrate is a steel substrate.

Assignees

• Univ Virginia Patent Foundation

Inventors

• Gupta Mool
• Shah Ankit

Classifications

• B22F1/054

  Nanosized particles · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B22F12/41

  characterised by the type, e.g. laser or electron beam · CPC title

• B22F10/50

  Treatment of workpieces or articles during build-up, e.g. treatments applied to fused layers during build-up · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title