球磨时间对石墨烯/ODS铜基复合材料组织与性能的影响

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Abstract A mixture of 0.1% graphene oxide and 0.5% ultrafine alumina particles (both mass fraction) were added to the copper powder for a mixed mechanical milling. Then the powders mixture was densified by vacuum hot pressing sintering technique and the thermal reduction of graphene oxide was realized at the same time. Graphene/ODS (G/ODS) copper matrix composites were prepared using graphene as the second reinforcement phase in the copper matrix composite. The effects of milling time on the microstructures and properties of Cu-0.5Al₂O₃-0.1GO composite before and after sintering were studied by SEM, XRD, Raman spectrum, mechanical properties test and physical properties test. The results show that the mechanical and physics properties both increase by increasing ball milling time (0-8 h). Graphene has a better combination and distribution in copper matrix with the 8-hour ball milling, which result in optimal comprehensive properties of sintered composites. The compression yield strength of G/ODS copper composite is 324MPa, 29.6% higher than that of ODS copper (250 MPa).The bending strength is 621 MPa, which is very near to that of ODS copper (629 MPa). The fracture mechanism of the composite is ductile fracture. The hardness, electric conductivity and thermal conductivity are 100 HV, 87.23%IACS and 385 W/(m∙K), respectively.

Key words： wet-milling ball milling time vacuum hot pressing G/ODS copper composite materials microstructures and properties

Received: 03 January 2018 Published: 12 July 2019

ZTFLH:	TB333
	TG146.1⁺1

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	YANG Changyi
	LIU Yunzhong
	YU Kaibin

Cite this article:

YANG Changyi,LIU Yunzhong,YU Kaibin. Effects of ball milling time on microstructures and properties of graphene/ODS copper composite materials[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(3): 281-291.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I3/281

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