Enhancement of thermal conductivity in diamond/Al composites through vacuum-pressure thermal diffusion sintering

doi:10.1088/1674-1056/adca9e

Abstract Improving the thermal conductivity (TC) of diamond-metal composites has always been a significant challenge in the field of thermal management. In this paper, diamond/Al composites are systematically studied, and the influence of the holding time (10-120 min) on interface structure and TC is discussed. The results of this research show that long-term thermal diffusion sintering can achieve dense interfacial bonding in diamond/Al composites, enhancing their TC. Diamond/Al composites with 50 vol% of 900 μm diamond attain the highest TC value of 888.73 W$\cdot$m$^{-1}\cdot$K$^{-1}$ under sintering conditions of 650 $^\circ $C, 50 MPa, and 120 min - nearly 92% of the theoretical value predicted by the Maxwell model. This study establishes that high TC can be achieved through long-term thermal diffusion alone, without the need for complex diamond surface coating or substrate alloying.

Keywords: diamond/Al composites thermal conductivity interfacial bonding

Received: 22 January 2025
Revised: 07 April 2025
Accepted manuscript online: 09 April 2025

PACS:	07.78.+s	(Electron, positron, and ion microscopes; electron diffractometers)
	12.38.Qk	(Experimental tests)
	07.30.-t	(Vacuum apparatus)
	02.30.Nw	(Fourier analysis)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12274372 and 12274373) and the Major Science and Technology Projects of Henan Province (Grant No. 231100230300).

Corresponding Authors: Zhuangfei Zhang, Kenan Li
E-mail: zhangzf@zzu.edu.cn;Likenan2004@163.com

Cite this article:

Wenxia Zhang(张文霞), Weixia Shen(沈维霞), Chao Fang(房超), Ye Wang(王烨), Yuewen Zhang(张跃文), Liangchao Chen(陈良超), Qianqian Wang(王倩倩), Kenan Li(黎克楠), Biao Wan(万彪), and Zhuangfei Zhang(张壮飞) Enhancement of thermal conductivity in diamond/Al composites through vacuum-pressure thermal diffusion sintering 2025 Chin. Phys. B 34 070703

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Enhancement of thermal conductivity in diamond/Al composites through vacuum-pressure thermal diffusion sintering

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