Effect of the Concentration of Cupric Oxide By Composite PEO on Thermal and Electrochemical Performances

Abstract

Plasma electrolytic oxidation (PEO) is an environmentally friendly process to generate the dense passivation oxide film on the surface of light metals, such as Al, Mg, and Ti. The created oxide layer was performed for enhancing the thermal transfer performance on an Al alloy by cupric oxide (CuO) particles in a conventional PEO electrolyte. The copper and cupric oxide has high thermal conductivity and high emissivity, therefore the composite PEO surface was expected high thermal transfer performance. The chemical bonding of composited PEO surface was inspected by X-ray photoelectron spectroscopy (XPS), not only Al-O bonding which was generated from substrate but also Cu-O were deposited. Laser flash analysis (LFA) method was adopted to measure thermal diffusivity to evaluate the velocity of heat transfer. And thermal radiation was evaluated by using Fourier transform infrared spectroscopy (FT-IR). The condition and quantity of cupric oxide was optimized through repeated experiment. As a result, the composite PEO surface was enhanced thermal conductivity and thermal radiation property in comparison with conventional PEO. And the thermal transfer performance was evaluated to applied LED module.