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Method for the production of thin layers of metal-ceramic composite materials

A technology of ceramic composite materials and cermets, applied in metal material coating process, nanotechnology for material and surface science, plating of superimposed layers, etc. technical troubles

Inactive Publication Date: 2009-12-09
DRITTE PATENTPORTFOLIO BET GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The problem in this case is that the sputtering technique is rather cumbersome and expensive, requiring high-tech voltage sources and large vacuum or clean room conditions, respectively, and requiring precise control systems and regulation system
[0020] Although pigmented alumina coatings are used commercially in solar collectors, they are not generally considered to be particularly selective

Method used

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  • Method for the production of thin layers of metal-ceramic composite materials
  • Method for the production of thin layers of metal-ceramic composite materials
  • Method for the production of thin layers of metal-ceramic composite materials

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Embodiment Construction

[0034] Specific embodiment: Ni-Al 2 O 3 Cermet Solar Absorber

[0035] Copper and aluminum substrates were used as starting materials. Before coating, the surface is finely polished to eliminate the negative impact of surface quality on solar energy absorption. Furthermore, the removal of surface roughness allows the layer to be applied uniformly without undesired deposits on undesired non-uniform locations.

[0036] Subsequently, the substrate was cleaned with ethanol and distilled water.

[0037] To prepare a suspension with a solids content of 2 to 20% by weight, first a metal salt, such as, in this example, a nickel salt (the amount depends on the amount of required metal parts). Then, add Al with an average particle size of 5 to 30 nm 2 o 3 Nano powder. The mixture was mechanically dispersed for 30 minutes under controlled temperature (cooling) and high rotational speed. All suspensions are electrostatically or electrosterically stable (depending on solvent) ...

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Abstract

The invention relates to a method for producing thin layers of metal-ceramic composite materials containing metallic nanoparticles. Said method can be used for coating a solar absorber with a cermet-based selectively absorbing surface layer that is very easy and inexpensive to produce in a reliable manner and has good spectral selectivity. In said method, one or more thin cermet layers are deposited on a substrate by immersing metallic substrates into a stabilized aqueous or organic suspension. The suspension is composed of alcoholic or aqueous solution in which ceramic nanopowders are dispersed and which contains the metallic portion of the cermet in the form of metal ions.

Description

technical field [0001] The present invention relates to a method for the preparation of thin layers of metal-ceramic composites comprising metal nanoparticles, and to the use of said method. Background technique [0002] In high-efficiency solar collectors, nearly the entire solar spectrum from the surface of the solar absorber is converted into heat energy. The absorber surfaces and the pipes connected thereto dissipate heat to a heat transfer fluid, such as water, flowing through the pipes. [0003] The absorber surface is the most important component of a solar collector. By using a spectrally selective absorber, this collector can achieve a high light-to-heat conversion rate. Such surfaces exhibit excellent absorption of radiation in the solar spectrum on Earth, while strongly reflecting thermal wavelengths, that is, they radiate only a small amount of absorbed heat. Since no natural material exists that exhibits said surface properties, special coatings must be used ...

Claims

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Application Information

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IPC IPC(8): F24J2/48C23C24/00C23C28/00C23C18/12C03C17/36
CPCC23C18/02Y02E10/40C03C17/36F24J2/4652C03C2217/479C23C28/00C03C2217/40C23C24/08C23C18/1283C23C18/08C03C17/3605C03C17/3644C23C26/00C23C18/1275C23C18/1208C23C28/042C23C18/127F24J2/485C03C17/3678C23C18/1241C23C18/1225B82Y30/00F24S70/20F24S70/30Y10T428/12736Y10T428/12771C23C18/12C23C24/00
Inventor R·克拉森M·内贾提
Owner DRITTE PATENTPORTFOLIO BET GMBH & CO KG