Influence of Shape Factor on Mechanical and Electrical Properties of Cu-W Composites with Micro-oriented Structure

doi:10.11901/1005.3093.2021.379

Chinese Journal of Materials Research

2022, Vol. 36

Issue (8): 571-578 DOI: 10.11901/1005.3093.2021.379

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Influence of Shape Factor on Mechanical and Electrical Properties of Cu-W Composites with Micro-oriented Structure

HAN Ying¹(

), LI Sida¹, CAO Yundong¹, LI Shujun²(

), LU Yanjun³, SUN Baoyu⁴

^1.School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.KINGSEMI Co. Ltd., Shenyang 110168, China
^4.Shenyang General Magnetic Co. Ltd., Shenyang 110159, China

Cite this article:

HAN Ying, LI Sida, CAO Yundong, LI Shujun, LU Yanjun, SUN Baoyu. Influence of Shape Factor on Mechanical and Electrical Properties of Cu-W Composites with Micro-oriented Structure. Chinese Journal of Materials Research, 2022, 36(8): 571-578.

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Abstract

Electrical contact Cu-W composites with three different micro-directional structure was designed, and characterized in terms of different shape factors. Then the influence of shape factors on their electrical conductivity and mechanical properties was investigated. Based on effective medium equation (GEM), conductive channel theory and simulation calculation, the current density distribution, and its relationship with the shape factor of composites with different skeleton structures were acquired. The results show that the closer the shape factor F to 1 is, the easier the formation of the cluster-like conductive channels are, thereby the better the conductivity is. The deformation characteristics of different composite materials were simulated and analyzed according to the Mises yield criterion, while the relationship between mechanical properties and shape factor was proposed, that is, with the increase of roundness of shape factor, the stability of force conduction element was improved. The larger the roundness of the shape factor is, the less deformation of the force conduction element is and the better the mechanical properties are. In a word, the comprehensive properties of the electrical contact Cu-W composite material can be further optimized by adjusting appropriately its conductivity and mechanical properties.

Key words: composite micro-oriented structure electrical and mechanical properties shape factor

Received: 24 June 2021

ZTFLH:

TG146.1

Fund: National Natural Science Foundation of China(51977132);Natural Science Foundation of Liaoning Province(2019-MS-249);Natural Science Foundation of Liaoning Province(LACT-007);Opening Project of National Key Laboratory of Shock Wave and Detonation Physics(6142A03203002)

About author: LI Shujun, Tel: 13840185937, E-mail: shjli@imr.ac.cn
HAN Ying, Tel: 13478250188, E-mail: hany_dq@sut.edu.cn;

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	Ying HAN
	Sida LI
	Yundong CAO
	Shujun LI
	Yanjun LU
	Baoyu SUN

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.379 OR https://www.cjmr.org/EN/Y2022/V36/I8/571

Fig.1 Arrange orderly of Cu-W composites with triangular, quadrilateral and hexagonal conductive elements

Fig.2 Stress-strain curve of pure Cu (a) and pure W (b)

Fig.3 Current density diagram of triangular, quadrilateral and hexagonal conducting cells

Fig.4 Current trend diagram of triangle, quadrilateral and hexagon conducting unit (overall and partial enlarged)

Fig.5 Current density integral of different internal struc-tures

Fig.6 Simplified resistance unit model

Fig.7 Cell resistance models of three kinds

Fig.8 Schematic diagram of three structural shape factors per unit area

Fig.9 Stress-strain cloud diagram of triangular, quadrilateral and hexagon force conduction micro element Cu-W composite

400 MPa	Triangle	Quadrilateral	Hexagon
Stress/MPa	$1.792 × 103$	$1.600 × 103$	$1.491 × 103$
Strain/mm	$1.416 × 10 - 2$	$1.353 × 10 - 2$	$1.312 × 10 - 2$

Table 1 400 MPa stress and strain

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