Process characteristics of micro-arc oxidation:
Micro-arc oxidation evolved from anodic oxidation but offers many advantages not found in anodic oxidation. The micro-arc oxidation equipment is simpler, the electrolyte is mostly alkaline, and it has minimal environmental impact. The solution temperature can vary over a wide range. The process of micro-arc oxidation is straightforward and versatile in material application.
Properties and characteristics of micro-arc oxidation ceramic film:
Micro-arc oxidation surface treatment technology differs from anodic surface oxidation technology, and the ceramic coating formed is far superior in terms of functionality and performance compared to anodic oxidation coatings. Depending on the material composition of the workpiece, the composition of the working fluid, the pulse waveform, and 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 layer produced by micro-arc oxidation has a hardness and wear resistance that can exceed淬火钢、hardened alloy, thus, in aerospace, aviation, or products requiring lightweight, aluminum alloys can be used to manufacture valve sleeves, cores, and cylinders for pneumatic and hydraulic servo valves. The ceramic layer generated by surface micro-arc oxidation can be used on the surface of aluminum alloy spindle components in high-speed motion.
2. Wear-reducing Surface
Due to micro-arc oxidation, the material surface can form a ceramic layer with micro-pores, reducing the friction coefficient 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 like automotive and motorcycle pistons, or any situation requiring a low friction coefficient.
Due to the ceramic coating on the surface, aluminum alloys can withstand high temperatures of 800~900°C, even up to 2000°C, in a short period, thus enhancing the operating temperature of alloy components like aluminum, magnesium, and titanium. They are suitable for instantaneous parts in rockets, cannons, and other applications.
3. Light Absorption and Light Reflective Surface
Create ceramic layers in various performance levels and colors, such as black or white, which can absorb or reflect over 80% of light energy, suitable for solar heat absorbers or heat sinks for electronic components. Colored ceramic surfaces made of aluminum, magnesium, titanium, and their alloys can be used as high-end decorative materials for cell phone shells and similar applications.
