A zirconium diboride-zirconia based high temperature solar energy absorbing coating and its preparation method

A solar energy absorption, zirconium diboride technology, applied in coating, metal material coating process, vacuum evaporation coating and other directions, can solve the problems of optical performance attenuation of absorption coating, long production cycle, low deposition rate, etc. The effect of good thermal stability, convenient operation and simple preparation process

Active Publication Date: 2020-11-03
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For the traditional metal-dielectric composite system, the metal or metal alloy as the filling particle is prone to diffusion, oxidation, agglomeration and other phenomena at high temperature, which leads to the attenuation of the optical properties of the absorbing coating.
Moreover, the deposition rate of radio frequency sputtering and other processes is low, the doping coefficient is difficult to control, the production cycle is long, the process is complicated, and the cost is high.

Method used

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  • A zirconium diboride-zirconia based high temperature solar energy absorbing coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing a zirconium diboride-zirconia-based high-temperature solar energy absorbing coating is carried out according to the following steps:

[0022] (1) Preparation of the infrared reflective layer: use a stainless steel sheet with a surface roughness of 3 nanometers as the substrate, use metal molybdenum Mo with a purity of 99.99% as the target, and use DC magnetron sputtering to pre-pump the vacuum chamber to a background vacuum to 1.0×10 -6 Torr; adjust the sputtering power density of the molybdenum target to 1 W / cm -2 , the intake of argon gas during sputtering deposition was 20 sccm, began to deposit metal molybdenum Mo film on the stainless steel of the endothermic body, the thickness of the metal molybdenum Mo film was 300 nm; during the sputtering process, the temperature of the base stainless steel was 100 o C;

[0023] (2) Preparation of the absorbing layer: After the infrared reflective layer is prepared, zirconium diboride with a purity of ...

Embodiment 2

[0028] A method for preparing a zirconium diboride-zirconia-based high-temperature solar energy absorbing coating is carried out according to the following steps:

[0029] (1) Preparation of the infrared reflective layer: use a stainless steel sheet with a surface roughness of 8 nanometers as the substrate, use metal molybdenum with a purity of 99.99% as the target, and use DC magnetron sputtering to pre-evacuate the vacuum chamber to 7.0×10 -6 Torr; adjust the sputtering power density of the molybdenum target to 5 W / cm -2 , the intake of argon gas during sputtering deposition was 80 sccm, and a molybdenum film was deposited on the stainless steel of the endothermic body with a thickness of 600 nm; during the sputtering process, the temperature of the base stainless steel was 250 o c.

[0030] (2) Preparation of the absorbing layer: After the infrared reflective layer is prepared, zirconium diboride with a purity of 99.99% is used as the magnetron sputtering target. Bottom...

Embodiment 3

[0035] A method for preparing a zirconium diboride-zirconia-based high-temperature solar energy absorbing coating is carried out according to the following steps:

[0036] (1) Preparation of the infrared reflective layer: use a nickel-based alloy with a surface roughness of 5 nanometers as the substrate, use metal molybdenum with a purity of 99.99% as the target, and use DC magnetron sputtering to pre-evacuate the vacuum chamber to 3.5×10 -6 Torr; adjust the sputtering power density of the molybdenum target to 2.5 W / cm -2 , the intake volume of argon during sputtering deposition is 30 sccm, begin to deposit metal molybdenum Mo thin film on the nickel-based alloy of absorber substrate, the thickness of metallic molybdenum Mo thin film is 480 nm; During the sputtering process, the base nickel-based alloy temperature for 200 o c.

[0037] (2) Preparation of the absorbing layer: After the infrared reflective layer is prepared, zirconium diboride with a purity of 99.99% is used...

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Abstract

The invention discloses a zirconium diboride-zirconium oxide-based high-temperature solar energy absorbing coating and a preparation method thereof, and relates to the technical field of novel high-temperature solar-energy light-spectrum selective absorption materials and vacuum coatings thereof. The zirconium diboride-zirconium oxide-based high-temperature solar energy absorbing coating adopts athree-layer composite structure, wherein the three-layer composite structure sequentially comprises an infrared reflecting layer, an absorbing layer and an antireflection layer from the surface of a substrate to the upper part; the infrared reflecting layer is formed by metal molybdenum Mo; the absorbing layer is formed by zirconium diboride ZrB2-zirconium oxide ZrO2 composite ceramic; the zirconium diboride ZrB2 and the zirconium oxide ZrO2 in the composite ceramic are at amorphous states; a zirconium diboride ZrB2-zirconium oxide ZrO2 composite ceramic absorbing layer is obtained through carrying out direct-current magnetron sputtering on the zirconium diboride; the zirconium oxide ZrO2 is obtained by partially oxidizing the zirconium diboride ZrB2; and the antireflection layer is formedby aluminum oxide Al2O3. The coating provided by the invention has high absorptivity, low emissivity and a favorable heat stability performance, and is suitable for industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation and vacuum coating, and relates to a high-temperature solar absorbing coating, in particular to a zirconium diboride-zirconia-based high-temperature solar absorbing coating and a preparation method thereof. Background technique [0002] The high temperature collector tube is the core component of trough solar thermal power generation, and the high temperature solar absorbing coating is the core material of solar thermal power generation. Solar absorbing coatings have high absorption in the visible to near-infrared range (0.3-2.5 μm) of the solar spectrum, and have low emissivity in the infrared band (2.5-50 μm). o C) The ability to effectively convert solar energy into thermal energy is the key to trough solar thermal power generation technology. For the traditional metal-dielectric composite system, the metal or metal alloy as the filling particle is prone to diffusion, ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/06C23C14/08C23C14/16C23C14/35F24S70/20
CPCC23C14/067C23C14/081C23C14/083C23C14/165C23C14/352
Inventor 高祥虎刘刚
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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