Crystalline Si coating on diamond particles by silane CVD and the improving thermal conductivity of diamond-Si/Al composites

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-04-15 DOI:10.1016/j.diamond.2025.112333

Jikun Deng, Jian Li, Zhenyu Li, Zechuan Wang, Guoqing Tong, Junwu Liu, Honghai Zhong, Yang Jiang

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Abstract

The chemical inertness of the diamond surface causes poor interfacial bonding between the diamond and matrix, which affects the thermal conductivity of composites, and further limits the industrial application of diamond composites. In this work, a uniform and dense Si film was deposited on large-grained diamond (150 μm) by silane chemical vapor deposition (CVD) to improve the wettability between diamond and aluminum (Al) metal matrix and thus enhance the thermal conductivity of diamond/Al composites. The analysis results showed that the surface of diamond particles was uniformly covered with a layer of Si coating after being treated by silane CVD at 700 °C for 30 min. Meanwhile, the oxidation temperature of the Si-coated diamond particles was increased by 70 °C, and the oxidative weight loss was reduced to 85 %, which possessed superior oxidation resistance and thermal stability than the pristine diamond particles. The thermal conductivity of the diamond-Si/Al composites with a diamond volume fraction of 45 % prepared by spark plasma sintering (SPS) technique reaches up to 467 W/m·K, the relative density is 99.1 %, and the coefficient of thermal expansion is also improved to 9.94 × 10⁻⁶ K⁻¹. The thermal stability of Si-coated diamond particles and their easy bonding with aluminum are conducive to expanding the application of the Si-coated diamonds in lightweight and high thermal conductivity composite packaging materials.

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硅烷气相沉积法在金刚石颗粒上包覆晶硅，提高了金刚石-硅/铝复合材料的导热性

金刚石表面的化学惰性导致金刚石与基体之间界面结合不良，影响了复合材料的导热性，进一步限制了金刚石复合材料的工业应用。本研究采用硅烷化学气相沉积（CVD）技术在大晶粒金刚石（150 μm）表面沉积均匀致密的Si膜，以改善金刚石与铝（Al）金属基体之间的润湿性，从而提高金刚石/Al复合材料的导热性。分析结果表明，硅烷CVD在700℃下处理30 min后，金刚石颗粒表面均匀覆盖了一层Si涂层，同时，Si涂层金刚石颗粒的氧化温度提高了70℃，氧化失重降低到85%，具有比原始金刚石颗粒更好的抗氧化性和热稳定性。火花等离子烧结（SPS）技术制备的金刚石体积分数为45%的金刚石- si /Al复合材料的导热系数高达467 W/m·K，相对密度为99.1%，热膨胀系数提高到9.94 × 10−6 K−1。硅包覆金刚石颗粒的热稳定性及其与铝的易结合有利于扩大硅包覆金刚石在轻质、高导热复合包装材料中的应用。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.