Process characteristics of micro-arc oxidation:
Micro-arc oxidation is a development from anodizing, yet it possesses numerous advantages not found in anodizing. The micro-arc oxidation equipment is simpler, and the electrolyte is mostly alkaline, resulting in minimal environmental pollution. The temperature range of the solution can vary widely. The process of micro-arc oxidation is straightforward and applicable to a wide range of materials.
Properties and characteristics of micro-arc oxidation ceramic film:
Micro-arc oxidation surface treatment technology differs from anodic surface oxidation technology, and the ceramic coatings formed are far more functional and superior in performance compared to anodic oxidation coatings. Depending on the composition of the workpiece material, the working fluid, the pulse waveform, and process parameters, the ceramic layer on the surface after micro-arc oxidation boasts a variety of functions and different application scopes, roughly 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 alloys. Therefore, in aerospace, aviation, or products requiring light weight, aluminum alloy can be used to manufacture valve sleeves, valve cores, cylinders, and hydraulic actuators for pneumatic and hydraulic servo valves. The ceramic layer generated by surface micro-arc oxidation can be applied to the surface of aluminum alloy spindles and components in high-speed motion.
2. Wear-reducing surface
Due to the micro-arc oxidation process, which forms a ceramic surface layer with micro-pores on the material, the coefficient of friction can be reduced to 0.06~0.12 when using traditional lubricants. Filling solid lubricants in the micro-pores further enhances the friction and wear reduction, making it suitable for applications such as car and motorcycle pistons, or other scenarios requiring a low coefficient of friction.
Due to the ceramic coating on its surface, the aluminum alloy can withstand temperatures of up to 800-900°C, even 2000°C in short periods, thereby increasing the operating temperature for alloy components like aluminum, magnesium, and titanium. It is suitable for instantaneous parts in applications such as 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 absorbers or heat sinks for electronic components. Colored ceramic surfaces made from aluminum, magnesium, titanium, and their alloys can be used as high-end decorative materials for mobile phone shells.
