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Materials 2017, 10(5), 454; doi:10.3390/ma10050454

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

Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
Physics Division, National Center for Theoretical Sciences, Hsinchu 30013, Taiwan
Metal Industries Research & Development Centre, Kaohsiung 811, Taiwan
Institute for Advanced Study, City University of Hong Kong, Hong Kong, China
These authors comtributed equally to the work.
Author to whom correspondence should be addressed.
Academic Editor: Thomas Fiedler
Received: 15 March 2017 / Revised: 18 April 2017 / Accepted: 23 April 2017 / Published: 26 April 2017
View Full-Text   |   Download PDF [5838 KB, uploaded 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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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