Microarc oxidation coated magnesium alloy radiator for light emitting diode: Microstructure, thermal radiative and dissipating property
Microarc oxidation coated magnesium alloy radiator for light emitting diode: Microstructure, thermal radiative and dissipating property
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发光二极管用微弧氧化涂层镁合金散热器：微观结构、热辐射散热性能
DOI：
10.1016/j.surfcoat.2016.03.077
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发表时间：
2016-05
影响因子：
5.4
通讯作者：
Y. Zhou
中科院分区：
文献类型：
--
作者：
Y.M. Wang;Y.C. Zou;H. Tian;L.X. Guo;J.H. Ouyang;D.C. Jia;Y. Zhou
发光二极管（LED）作为新一代光源，其寿命和发光效率随着P-N结温度（Tj）的升高而迅速下降。采用微弧氧化技术在镁合金散热器表面制备高发射率陶瓷涂层，以提高LED的散热性能。研究了不同相组成的微弧氧化膜层对红外发射率和Tj的影响。结果表明，Mg-Si-O和Ca-Mg-Si-O涂层在623 K、8-20 μm波长范围内具有高达0.8的发射率。Ca-Mg-Si-O涂层中CaSiO 3相的形成有助于高发射率区的短波长移动，这是由于晶格振动吸收增强所致。增加涂层表面粗糙度有利于提高发射率。镀镁散热器增强了散热效果，显著促进了LED的散热。与未涂覆的镁散热器相比，Mg-Si-O和Ca-Mg-Si-O涂覆样品在氧化时间为10 min时，使LED的温度分别下降约6.2 °C和7.3 °C。
Light emitting diode (LED) as a new generation light source whose lifetime and luminescence efficiency drop rapidly with the P-N junction temperature (Tj) increase. In this paper, a high emissivity ceramic coating fabricated by microarc oxidation (MAO) on magnesium alloy radiator enhanced the heat dissipation of LED. And the effects of MAO coatings with different phase composition on infrared emissivity and Tjwere studied. The results show that Mg-Si-O and Ca-Mg-Si-O coatings exhibit a high emissivity up to 0.8 at 623 K within 8–20 μm wavelength range. The formation of CaSiO3phase in Ca-Mg-Si-O coating contributes to the short wavelength shift of the high emissivity region due to the enhanced lattice vibration absorption. The increasing coating surface roughness is beneficial to promote the emissivity. The enhanced thermal radiation with coated magnesium radiator significantly promoted the heat dissipating of LED. Compared with the uncoated magnesium radiator, the Mg-Si-O and Ca-Mg-Si-O coated samples with oxidation time of 10 min enable the temperature of LED to drop approximately at 6.2 °C and 7.3 °C, respectively.
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影响因子：
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作者：
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DOI：
10.1016/j.ijheatmasstransfer.2006.04.037
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2006-11-01
影响因子：
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