Thermal Protection of Internal Combustion Engines Pistons
Thermal Protection of Internal Combustion Engines Pistons:
The bottom side of engine piston is coated with heat-resistant ceramic nanocomposite coatings by micro arc oxidation. Micro-Discharges resulting in high surface areas form a modified ceramic coating.
- Simple invention and Environmental Technology, no requirements for surface preparing before testing of micro arc oxidation.
- Thermal Protection efficiency – piston temperature is reduced to 45-78 degrees Celsius according motor testing.
- Project costs: Cost estimates show that economic efficiency for lean manufacturing implementation of Micro-arc oxidation (MAO) will bring higher Cost Recovery Ratio equaled to 0.7 (standard Cost Recovery Ratio equaled to 0.15) and it has a payback period of 18 months, which is shorter than a standard payback period for the machine building sector.
Properties of micro-arc oxidation ceramic coating:
- the thickness goes up to 400 µm;
- the microhardness limit is 2200 kg/mm2;
- "heat resistant" grade: at temperatures up to 2200°C:
- thermal conductivity values from 0.1 to 10 W/mk;
- porosities ϕ ranging from 2 to 50 percent.