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| Effect of particle size， grade and coating thickness of diamond coated with chromium film on thermal properties of diamond/Cu composite |
| HUANG Xia1,2，XU Yan-jun1,2，YIN Xiang1,2，LIU Yi-bo1,2，ZHENG Yong-xiang1,2，GE Ke1,2 |
（1. Advanced Technology & Materials Co.， Ltd.， Beijing 100081，China
2. Beijing Gang Yan Diamond Product Company， Beijing 102200， China） |
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Abstract Diamond/Cu composites were prepared via infiltration method using diamonds with surface modification as raw materials. The effect of particle size， diamond grade and coating thickness on the composites’ thermal conductivity （TC） and thermal expansion characteristics were studied. The results show that the TC of diamond/Cu composites increases with diamond particle size and diamond grade. The TC is 787 W/（m·K） when the thickness of chromium coating on diamond is 210 nm， and 633 W/（m·K） when the thickness is 150 nm， which indicates that too thin chromium coating on diamond leads to the decrease of composite thermal conductivity. The coefficient of thermal expansion （CTE） of diamond/Cu composites is among （3.00～8.00）×10－6 K－1 at temperature between 30～200 ℃，and increases with temperature increasing.
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Received: 01 August 2017
Published: 26 June 2018
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2018, Vol. 28 
