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<p>To address the limitations of radiative heat transfer efficiency in aluminum alloy heat fins, traditional dry coating methods have been used to improve their absorptivity and emissivity. However, these methods face challenges such as time consumption, high costs, and insufficient adhesion. This study proposes a hybrid process combining Ultrasonic Mechanical Coating (UMCA) and laser cladding to enhance the thermal radiation performance of aluminum alloy heat sinks. In the first step, Al₂O₃ ceramic powder with high thermal radiation capacity is bombarded and implanted onto the surface of the aluminum alloy substrate using UMCA, which improves the adhesion between the coating and the substrate. Subsequently, laser cladding is employed to locally melt the pre-coated layer and integrate it with the substrate, forming a porous structure that further enhances radiative heat transfer. Experimental results demonstrate that the layered porous coating produced by UMCA, in combination with laser cladding, significantly improves the thermal radiation efficiency. This enhancement results in a temperature reduction of 11.8&#xa0;°C compared to traditional aluminum alloy fins. This study provides an innovative approach for designing high-efficiency heat dissipation modules and highlights the potential of the proposed hybrid process for thermal management applications.</p>

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Enhancing radiative heat transfer efficiency of aluminum alloy fins using ultrasonic mechanical coating and laser cladding

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Cheng-Yu Lu

摘要

To address the limitations of radiative heat transfer efficiency in aluminum alloy heat fins, traditional dry coating methods have been used to improve their absorptivity and emissivity. However, these methods face challenges such as time consumption, high costs, and insufficient adhesion. This study proposes a hybrid process combining Ultrasonic Mechanical Coating (UMCA) and laser cladding to enhance the thermal radiation performance of aluminum alloy heat sinks. In the first step, Al₂O₃ ceramic powder with high thermal radiation capacity is bombarded and implanted onto the surface of the aluminum alloy substrate using UMCA, which improves the adhesion between the coating and the substrate. Subsequently, laser cladding is employed to locally melt the pre-coated layer and integrate it with the substrate, forming a porous structure that further enhances radiative heat transfer. Experimental results demonstrate that the layered porous coating produced by UMCA, in combination with laser cladding, significantly improves the thermal radiation efficiency. This enhancement results in a temperature reduction of 11.8 °C compared to traditional aluminum alloy fins. This study provides an innovative approach for designing high-efficiency heat dissipation modules and highlights the potential of the proposed hybrid process for thermal management applications.