Method for preparing alumina-ferric oxide ceramic membrane with controllable solar absorptance

A solar absorptivity, alumina technology, applied in anodizing and other directions, can solve the problems of space stability, UV radiation resistance and poor adhesion, unable to adjust the solar absorptivity of the coating, etc., to achieve space stability and The effect of good bonding force, high hardness and low process cost

Active Publication Date: 2010-05-12
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention aims to solve the problem that the existing method makes the surface of LY12 aluminum alloy have a specific solar absorptivity, which has poor dimensional stability, ultraviolet radiation resistance and bonding force, and the problem that the solar absorptivity of the coating cannot be adjusted during the preparation process. , and provide a preparation method of alumina-iron oxide ceramic film with controllable solar absorption rate

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  • Method for preparing alumina-ferric oxide ceramic membrane with controllable solar absorptance

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specific Embodiment approach 1

[0009] Specific embodiment one: the preparation method of the aluminum oxide-iron oxide ceramic film with controllable solar absorption rate in this embodiment is realized according to the following steps: 1. The surface of LY12 aluminum alloy is pretreated by chemical degreasing process, and then cleaned with distilled water, Then put it into acetone solution for ultrasonic treatment for 1-10min, wash with distilled water and dry; React in current mode to obtain LY12 aluminum alloy after micro-arc oxidation; 3. Place the LY12 aluminum alloy after micro-arc oxidation in distilled water with a pH value of 5.5 to 6.6 and a temperature of 94 to 100°C for 5 to 40 minutes, namely Complete the preparation of alumina-iron oxide ceramic film with controllable solar absorption rate; wherein the electrolyte solution in the micro-arc oxidation electrolytic cell of step 2 is composed of sodium phosphate, ammonium fluoride, ethylenediamine, ferrous sulfate, copper acetate and ethylenediamin...

specific Embodiment approach 2

[0015] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the step 1 chemical degreasing process is to treat at a temperature of 60-70 °C for 1-3 minutes, and the degreasing agent is dissolved in sodium carbonate and trisodium phosphate Made in water, the concentration of sodium carbonate in the degreasing agent is 30-40g / L, and the concentration of trisodium phosphate is 50-60g / L. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0016] Specific embodiment 3: The difference between this embodiment and specific embodiment 2 is that in step 1, put it into the acetone solution and sonicate it for 8 minutes. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention discloses a method for preparing an alumina-ferric oxide ceramic membrane with controllable solar absorptance, relates to a method for preparing the alumina-ferric oxide ceramic membrane, and solves the problems that space stability, ultraviolet irradiation resistance and binding force are poor and the solar absorptance of a coating is difficult to adjust on a LY12 aluminium alloy surface with specific solar absorptance in the conventional method. The method comprises the following steps: 1, performing surface pretreatment and ultrasonic treatment on the LY12 aluminium alloy, and washing the LY12 aluminium alloy with distilled water and drying the LY12 aluminium alloy; 2, placing the dried LY12 aluminium alloy in a micro-arc oxidation electrolytic cell for electrolyzation to obtain a micro-arc oxidized LY12 aluminium alloy; and 3, placing the micro-arc oxidized LY12 aluminium alloy in the distilled water for hole sealing. The space stability and the binding force of the obtained ceramic membrane are good; the thickness of the membrane layer is controlled between 5 and 100 mu m and the ultraviolet irradiation resistance is good; and the solar absorptance can be controlled between 0.4 and 0.9.

Description

technical field [0001] The invention relates to a preparation method of an alumina-iron oxide ceramic membrane. Background technique [0002] LY12 is a high-hardness aluminum alloy containing 3.8% to 4.9Cu and 1.2% to 1.8% Mg. As the most commonly used and most important lightweight structural material, it has been widely used in daily life, industry, aviation, aerospace and other fields. The LY12 aluminum alloy used in aviation, aerospace, cameras, optical instruments, decoration and other fields has specific requirements for its solar absorption rate because its surface needs to be used to control temperature and eliminate stray light. [0003] At present, there are two methods for making the surface of LY12 aluminum alloy have a specific solar absorption rate: one is an anodic oxidation film-based coating obtained through anodic oxidation coloring or electrolytic coloring; the other is a mixture of binders and dyes Then apply to the substrate surface. Although these two...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04
Inventor 吴晓宏秦伟王小东王锐
Owner HARBIN INST OF TECH
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