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首页> 外文期刊>Journal of Composite Materials >Thermal conductivity and microstructure of Al/diamond composites with Ti-coated diamond particles consolidated by spark plasma sintering
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Thermal conductivity and microstructure of Al/diamond composites with Ti-coated diamond particles consolidated by spark plasma sintering

机译：火花等离子体烧结固结Ti涂层金刚石颗粒的Al /金刚石复合材料的导热性和微观结构

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摘要

Metal/diamond composites have been considered as the new generation of thermal management material. The critical challenge to obtain composites with high thermal conductivity (TC) is to improve the interfacial bonding between the matrix and diamond. In the present study, a titanium coating was plated on the surface of diamond particles via vacuum evaporation-deposition, and Al/diamond composites were consolidated by spark plasma sintering (SPS) technique. The TC and microstructure of composites, respectively, with coated and uncoated diamond particles are compared and discussed. The results show that the Ti coating can significantly increase the wetting property between Al and diamond, leading to a strong interfacial bonding. The diffusion of Ti into the matrix and the formation of TiC are detected at the Al-diamond interface. The properties of composites, respectively, with coated and uncoated diamond exhibit different trends with increasing sintering temperature or diamond volume fraction. Compared with composites with uncoated particles, the Al/Ti-diamond composites obtained the much higher relative density and TC as high as 491 W/mK. Based on the comparison between the experimental and theoretical values, it is found that the thermal conductivities of Al/Ti-diamond composites have reached or surpassed the theoretical calculations with the particle volume fraction not more than 50%.
机译：金属/金刚石复合材料已被认为是新一代的热管理材料。获得具有高导热率（TC）的复合材料的关键挑战是改善基质与金刚石之间的界面结合。在本研究中，通过真空蒸发沉积在金刚石颗粒表面镀钛涂层，并通过火花等离子体烧结（SPS）技术固结铝/金刚石复合材料。比较并讨论了分别具有涂层和未涂层​​金刚石颗粒的复合材料的TC和微观结构。结果表明，Ti涂层可以显着提高Al与金刚石之间的润湿性，从而导致牢固的界面结合。在铝-金刚石界面处检测到Ti向基体中的扩散和TiC的形成。随着烧结温度或金刚石体积分数的增加，分别涂覆和未涂覆金刚石的复合材料的性能表现出不同的趋势。与没有涂层的复合材料相比，Al / Ti-金刚石复合材料的相对密度更高，TC高达491 W / mK。通过实验值和理论值的比较，发现Al / Ti-金刚石复合材料的导热率达到或超过理论计算值，且颗粒体积分数不超过50％。

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