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High Thermal Dissipation of Al Heat Sink When Inserting Ceramic Powders by Ultrasonic Mechanical Coating and Armoring

1
Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
2
Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan
3
Metal Industries Research & Development Centre, Kaohsiung 811, Taiwan
4
Institute for Advanced Study, City University of Hong Kong, Hong Kong, China
*
Author to whom correspondence should be addressed.
These authors comtributed equally to the work.
Academic Editor: Thomas Fiedler
Materials 2017, 10(5), 454; https://doi.org/10.3390/ma10050454
Received: 15 March 2017 / Revised: 18 April 2017 / Accepted: 23 April 2017 / Published: 26 April 2017
Aluminum alloys, which serve as heat sink in light-emitting diode (LED) lighting, are often inherent with a high thermal conductivity, but poor thermal total emissivity. Thus, high emissive coatings on the Al substrate can enhance the thermal dissipation efficiency of radiation. In this study, the ultrasonic mechanical coating and armoring (UMCA) technique was used to insert various ceramic combinations, such as Al2O3, SiO2, or graphite, to enhance thermal dissipation. Analytic models have been established to couple the thermal radiation and convection on the sample surface through heat flow equations. A promising match has been reached between the theoretical predictions and experimental measurements. With the adequate insertion of ceramic powders, the temperature of the Al heat sinks can be lowered by 5–11 °C, which is highly favorable for applications requiring cooling components. View Full-Text
Keywords: mechanical coating; ceramic coating; heat dissipation; thermal properties mechanical coating; ceramic coating; heat dissipation; thermal properties
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Tsai, W.-Y.; Huang, G.-R.; Wang, K.-K.; Chen, C.-F.; Huang, J.C. High Thermal Dissipation of Al Heat Sink When Inserting Ceramic Powders by Ultrasonic Mechanical Coating and Armoring. Materials 2017, 10, 454.

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