Burak Evren, Gökçe Evren, Cem Kıncal, Nuri Solak, M. Ürgen
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引用次数: 0
摘要
随着电子设备功率密度的增加,要求散热器具有更强的散热性能已成为先进散热技术的当务之急。铜/金刚石复合材料是具有高导热性能的新一代散热器,但制造这些复合材料需要高能量和复杂的仪器。在这项研究中,铜/金刚石复合材料是通过电铸法制造的。对沉积物共沉积工艺进行了改进,以获得具有可定制体积分数的均匀金刚石颗粒分布。金刚石颗粒最初沉淀在电解液外的阴极表面,然后将装置浸入酸性硫酸铜电铸槽中。在电解液中加入不同量(0-100 毫克/升)的硫脲,以增强基质与颗粒之间的界面。利用优化的沉积条件,用电沉积铜填充金刚石颗粒之间的间隙。生产完成后,复合结构会以理想的形状和尺寸自行脱离阴极。研究了操作条件对阴极极化、复合微观结构和热性能的影响。采用优化参数制造的含 49 Vol.% 金刚石的样品的热导率超过 667 W m-1 K-1。热导率的提高和界面结构的增强归功于优化电解液出色的空隙填充能力。
Enhanced interface structure of electroformed copper/diamond composites for thermal management applications
As the power density of electronic devices increases, the requirement for heat sinks with enhanced thermal properties becomes imperative for advanced heat dissipation. Copper/diamond composites are next-generation heat dissipators with high thermal conductivities, yet fabrication of these composites requires high energy and complex instruments. In this study, copper/diamond composites are fabricated by electroforming. The sediment co-deposition process is modified to obtain uniform diamond particle distribution with tailorable volume fraction. Diamond particles were initially settled on the cathode surface outside the electrolyte, and then the setup was immersed in an acidic copper sulfate electroforming bath. Varying amounts (0–100 mg l−1) of thiourea are introduced to the electrolyte to enhance the matrix–particle interface. The gaps between diamond particles are filled with electrodeposited copper using optimized deposition conditions. The composite structure detaches from the cathode by itself after the production with desired shape and dimensions. The effect of operating conditions on cathodic polarization, composite microstructure, and thermal properties are investigated. Thermal conductivity of 49 vol.% diamond containing sample fabricated with optimized parameters exceeds 667 W m−1 K−1. The increase in thermal conductivity and enhanced interface structure is attributed to the excellent void-filling ability of the optimized electrolyte.
期刊介绍:
Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.