共查询到18条相似文献,搜索用时 66 毫秒
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钨铜复合材料以高导热率,LED芯片热匹配等特性,成为LED散热基体的重点开发对象,而钨铜箔片轧制表面高平整性是首要前提,研究高效可行的微观整平方法意义深远。本文采用电解抛光的方法对钨铜箔片(W90Cu10)进行多次重复正交试验。以硫酸-磷酸系作为电解液,通过对抛光后箔片宏观表面质量评定、反射率测量及SEM微观表面形貌分析,初步确定了W90Cu10电解抛光的最佳工艺参数,分析了抛光液及工艺参数对抛光质量的影响及钨铜箔片电解抛光机理。实验表明:在硫酸与磷酸体积比2∶7、温度为45~55℃、抛光时间4~6 min、电流密度15~25 A/dm2条件下电解抛光试样表面相对反射率高达90%以上,表面呈镜面光亮。 相似文献
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通过对LED灯具散热型材的外形结构要求进行分析,扼要地介绍了该型材模具的设计要点,包括分流孔、工作带、空刀和焊合室等的设计。 相似文献
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以单片机AT89C51为控制核心,将半导体制冷技术引入到LED散热研究中,采用PID算法和PWM调制技术实现对半导体制冷片的输入电压的控制,进而实现了对半导体制冷功率的控制,通过实验验证了该方法的可行性. 相似文献
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分析了韶关冶炼厂锌精馏过程中铅塔冷凝器实际冷凝能力不足,冲顶事故时有发生的原因,并对二系统1#铅塔冷凝器散热进行了测试。测试结果表明:除顶部壁面处于良好的工作状况外,冷凝器各竖壁面的温度沿高度方向的变化显著,温差较大;在同一高度处,冷凝器北壁面温度明显高于东、西两侧壁面温度。 相似文献
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依据工程实例,对加热炉水梁立柱散热计算建立了两种模型,对不同模型下水梁立柱散热的计算结果进行了对比,同时结合水梁立柱的实际运行情况,对水梁立柱的复合包扎结构厚度对散热的影响进行了分析。 相似文献
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韩珮 《Canadian Metallurgical Quarterly》2011,(4)
本文通过分析现代城市路灯的缺陷,提出合理的城市路灯解决方法和设计思路,从而矫正城市中错位的路灯艺术。 相似文献
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[目的]为养蜂场所设计一种红色照明灯.用于夜间、暗室内取蛮或观察管理蜂群.(方法]分析蜜蜂与人视觉器官的视觉生物学特性,采用发光波长在650-780 nm的高亮度红光LED来作为光源,并举例红光LED头灯的设计,对头灯光源的波长和亮度进行了详细分析.[结果]LED光源的适宜照度为3-10 cd/m2.基于蜜蜂对红色光呈现色盲的生物学特性.以红光LED为光源的LED灯,作为养蜂场的照明灯具,使蜂群不受或少受惊扰,有效减少蜂群的飞遗损失.[结论]结合现代电子技术,顺应蜂群的生理特征,研发出合理先进的蜂具. 相似文献
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A computational model of thermal behavior of the top-surface slag layers in continuous casting mold was applied to interpret the thermal insulation of mold powder. The temperature drop of liquid steel caused by heat removal at the interface of molten steel and slag in mold was proposed to evaluate the thermal insulation of mold slag. The calculation results show that slag consumption is one of important factor influencing the temperature drop, while the casting speed has no obvious effect on it. With the increase of slag consumption, the temperature drop is increased. 相似文献
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Thermal fatigue test has been carried out on widely used hot work steel 4Cr5MoSiVl and a low alloyed steel 3Cr3MoV in temperature range of 200 to 700 °C. Tempering resistance, as well as high temperature hardness/strength of steel specimens, works as a dominating material parameter on thermal fatigue resistance. During the heating period, high hardness can depress the inelastic deformation. This deformation is the origination of tensile stress, which acts as the driving force of heat checking during the cooling period. The cyclic strain-oxidation interaction can speed up the damage on surface defects, which plays an obvious role in initiation of thermal cracks. On 4Cr5MoSiVl steel specimens, borders between the matrix and inclusions such as titanium compounds, or lager carbides such as primary carbides, are focused by strain and attacked by oxidation, and are main initiating places of cracks. While on 3Cr3MoV steel specimens, larger strain causes plastic deformation concentrating around grain boundaries. Then the following oxidation accelerates this grain boundary damage and creates cracks. 相似文献
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