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To acquire a well bonded interface between the copper and the diamond particles in diamondcopper matrix composites, an available process to apply a vapor deposited aluminum(Al) coating onto diamond particles was used to solve this interfacial problem. The diamond-copper matrix composites were prepared by spark plasma sintering(SPS) process and the effect of Al-coated diamond particles was demonstrated. The experimental results showed that the densification, interfacial bonding and thermal conductivity of Al-coated composites were evidently improved compared to those of the uncoated composites. A maximum thermal conductivity(TC) of 565 W/(m·K) was obtained in the coated composite containing 50vol% diamond particles sintered at 1163 K. Additionally, the experimental data of thermal conductivity and coefficient of thermal expansion(CTE) were compared with the predictions from several theoretical models.
To acquire a well bonded interface between the copper and the diamond particles in diamond copper matrix composites, an available process to apply a vapor deposited aluminum (Al) coating onto diamond particles was used to solve this interfacial problem. The diamond-copper matrix composites were prepared by spark plasma sintering (SPS) process and the effect of Al-coated diamond particles was demonstrated. The experimental results showed that the densification, interfacial bonding and thermal conductivity of Al-coated composites were evidently improved compared to those of the uncoated composites. A maximum thermal conductivity (TC) of 565 W / (m · K) was obtained in a coated composite containing 50 vol% diamond particles sintered at 1163 K. Additionally, the experimental data of thermal conductivity and coefficient of thermal expansion (CTE) were compared with the predictions from several theoretical models.