Al2O3含量对放电等离子烧结Al2O3/Cu复合材料组织与性能的影响

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Abstract Al₂O₃/Cu composite materials, with micron Cu powders as matrix phase and nano Al₂O₃ particles as insulating phase were prepared by mechanical ball milling combined with spark plasma sintering. The effects of Al₂O₃ content on the microstructure, resistivity and thermal conductivity of the Al₂O₃/Cu composite materials were investigated. The results show that the Al₂O₃/Cu composite materials are core-shell structure. With the increase of Al₂O₃ content, the covering effect of the Al₂O₃ coating on the copper substrate is gradually enhanced. When w(Al₂O₃) is 5%, the thermal conductivity of the Al₂O₃/Cu composites is relatively high, which is 85.92 W/(m·K), but the resistivity is relatively low (12.6 mΩ·cm). When w(Al₂O₃) increases to 15%, the density of the Al₂O₃/Cu composites decreases to 6.69 g/cm³ and the porosity is higher. But the resistivity significantly increases to 2.09×10⁸ mΩ·cm, which is about 10¹¹ times of Cu and the thermal conductivity is 7.6 W/(m·K), which is obviously higher than that of the traditional metal substrate.

Key words： mechanical ball milling spark plasma sintering Al₂O₃/Cu composites resistivity thermal conductivity

Received: 06 November 2020 Published: 22 March 2021

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	ZHANG Yanglin
	LUO Zigui
	HU Xiaoming
	FENG Bo
	LI Rusong
	FAN Xi’an

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ZHANG Yanglin,LUO Zigui,HU Xiaoming, et al. Effects of Al₂O₃ content on microstructure and properties of Al₂O₃/Cu composite materials prepared by spark plasma sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 9-14.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I1/9

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