Process characteristics of micro-arc oxidation:
Micro-arc oxidation evolved from anodizing but possesses many advantages not found in traditional anodizing. The micro-arc oxidation equipment is simpler, the electrolyte is mostly alkaline, and it has minimal environmental impact. The temperature range of the solution can be quite broad. The process of micro-arc oxidation is simpler and more versatile in material application.
Properties and characteristics of micro-arc oxidation ceramic film:
Micro-arc oxidation surface treatment technology differs from anodizing surface oxidation technology, and the ceramic coating formed is far superior in terms of functionality and performance compared to anodized coatings. Depending on the material composition of the workpiece, the composition of the working fluid, the pulse waveform, and the process parameters, the ceramic layer on the surface after micro-arc oxidation exhibits a variety of functionalities and different application scopes, generally as follows:
1. High hardness, high strength
The ceramic thin layer formed by micro-arc oxidation has a hardness and wear resistance that can exceed hardened steel and hard alloy, making it suitable for the manufacture of valve sleeves, valve cores, and cylinders for pneumatic and hydraulic servo valves in aerospace and aviation applications, or for products requiring light weight. Additionally, the surface of aluminum alloy spool components in high-speed movement can utilize the ceramic layer formed by surface micro-arc oxidation.
2. Abrasion-Reduced Surface
Due to the micro-arc oxidation process, which forms a ceramic surface with micropores on the material, the coefficient of friction can be reduced to 0.06~0.12 when using traditional lubricants. Filling solid lubricants into the micropores further enhances the reduction of friction and wear, making it suitable for applications such as automotive and motorcycle pistons, or any other scenarios requiring a low coefficient of friction.
Due to the ceramic coating on the surface, aluminum alloys can withstand high temperatures of up to 800~900°C, even 2000°C in a short period, thereby increasing the operating temperature of alloy components like aluminum, magnesium, and titanium. They are suitable for use in parts requiring immediate action, such as in rockets and cannons.
3. Light Absorption and Light Reflective Surface
Create ceramic layers in various performance levels and colors, such as black or white, capable of absorbing or reflecting over 80% of light energy, suitable for solar heat collectors or heat sinks for electronic components. Aluminum, magnesium, titanium, and their alloys can be used to form colored ceramic surfaces, serving as high-end decorative materials for phone shells and similar applications.
