Preparation method of composite ceramic coating layer

Abstract

A method for preparing an aluminum alloy element surface coating comprises the following steps of sequentially pre-treating the aluminum alloy element surface, preparing aluminum alloy element surface arcing-blocking coating, preparing aluminum alloy surface insulation composite ceramic coating and performing post-treatment; the preparation of aluminum alloy element surface arcing-blocking coating is to perform coating in a deionized water electrolyte system composed of NaOH, Na2SiO3, (NaPO3)6 and K2ZrF6; the system for the preparation of aluminum alloy element surface coating comprises a stainless steel solution tank (7), tooling (4), an aluminum alloy element (5), a stirrer (2), a thermometer (6), a water-circulating cooling device (1) and power supply equipment (8). The aluminum alloy member surface coating obtained from the method and the system of the invention has the advantages of high toughness and strong binding capacity with the surface of the aluminum alloy element, long service life and excellent heat insulation performance.

Description

[0001] This application is a divisional application of the invention patent with application number 201210143986.9 and application date of May 10, 2012. technical field [0002] The invention relates to a method and system for preparing a composite ceramic coating with excellent thermal insulation performance on the working surface of an aluminum alloy part. Background technique [0003] Aluminum alloy has been widely used and advocated in industry as a substitute for metal materials such as steel to reduce the weight of parts. However, aluminum alloy has defects such as low melting point, fast heat transfer, and easy oxidation at high temperature. As an excellent thermal insulation coating, zirconia has been paid attention to by various countries, and a lot of research has been carried out. However, due to the limitations of its own characteristics and preparation technology, the existing technology mainly uses plasma spraying, physical vapor deposition and other technical m...

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Problems solved by technology

[0003] Aluminum alloys have been widely used and advocated in industry as a substitute for metal materials such as steel to reduce the weight of parts, but aluminum alloys have defects such as low melting point, fast heat transfer, and easy oxidation at high temperatures.

As an excellent thermal insulation coating, zirconia has been paid attention to by various countries, and a lot of research has been carried out. However, due to the limitations of its own characteristics and preparation technology, the existing technology mainly uses plasma spraying, physical vapor deposition and other technical means to prepare coatings. , Plasma spraying, physical vapor deposition and other methods all melt zirconia and then evaporate and deposit it on the surface of the substrate. Due to the characteristics of aluminum alloy materials, it is difficult to prepare zirconia ceramic coatings on its surface by conventional methods.

[0004] Generally speaking, the existing preparation process of zirconia ceramic coating has insufficient coating bonding force and is easy to be brittle, so the service life is not long, and the existing preparation processes such as plasma spraying, electron beam physical vapor deposition and other technical means are due to the need High-temperature molten zirconia is evaporated and deposited on the surface of the workpiece substrate, so the coating can only be prepared on the surface of high-melting point materials such as steel and composite materials, and due to the difference in thermal expansion coefficient between the coating and the substrate, it is easy to cause the coating to cool down to room temperature. Cracks will affect the adhesion of the coating and limit the application of zirconia on the surface of light alloy materials such as aluminum alloy

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