Stable solar selective absorbing coating layer under medium/high-temperature atmospheric environment

Abstract

The invention belongs to the technical field of solar heat utilization, and in particular, relates to a stable solar selective absorbing coating layer under a medium / high-temperature atmospheric environment. The solar selective absorbing coating layer comprises an infrared high reflection layer, a first absorption layer, a second absorption layer and an anti-reflection layer arranged on the surface of a substrate in sequence from inside to outside; the first absorption layer and the second absorption layer both comprise absorption modules and low-melting-point stable components; the mass percentage of the absorption components in the first absorption layer is 10-100%; and the mass percentage of the absorption components in the second absorption layer is lower than and equal to the mass percentage of the absorption components in the first absorption layer. Compared with the prior art, the low-melting-point stable components are introduced into the first and second absorption layers, sothat the relative substrate temperature in film deposition can be increased, the film compactness is improved, the probability of introducing oxygen in films is reduced, the oxidation resistance of the films is improved, the films cannot generate oxidation, decomposition and crystal form transformation under medium / high-temperature atmosphere conditions, and the stability of the films under the medium / high-temperature atmosphere conditions is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of solar thermal utilization, and in particular relates to a stable solar selective absorption coating in a medium-high temperature atmospheric environment. Background technique [0002] Solar medium and high temperature collectors are widely used in trough solar thermal power generation, solar steam boilers, solar drying, and solar air conditioning. The surface of the metal inner tube (absorbing tube) is coated with a selective absorption coating to achieve high absorption and low emission. . [0003] The existing medium and high temperature heat collectors generally use cermet structure as the absorbing layer of the coating, mainly using W, Mo, etc. as metal components, and Al 2 o 3 Do ceramic components; W, Mo, Al 2 o 3 The melting point of such materials is extremely high, and the density of the film layer prepared at a higher substrate temperature is still poor, thus forming a lot of channels for ox...

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Problems solved by technology

[0003] The existing medium and high temperature heat collectors generally use cermet structure as the absorbing layer of the coating, mainly using W, Mo, etc. as metal components, and Al 2 o 3 Do ceramic components; W, Mo, Al 2 o 3 The melting point of other materials is extremely high, and the density of the film prepared at a higher substrate temperature is still poor, thus forming a lot of channels for oxygen to enter, causing the W and Mo elements in the film to be oxidized under atmospheric conditions

In addition, in the prior art, Al 2 o 3 Prepared by radio frequency sputtering method, this method has the following disadvantages: slow deposition rate, increased equipment cost, hidden danger of leakage, etc.

Therefore, it is very necessary to increase the substrate temperature during deposition, but the substrate temperature cannot be increased indefinitely. The higher the substrate temperature, the higher the manufacturing cost of the equipment.

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