Fabrication and Uniaxial Tensile Properties of Soldered Porous Copper Fiber-Sintered Sheets

Ruiliang Liu,Wei Zhou,Dongsheng Xu,Shuangli Li

doi:10.1155/2019/6454087

Ruiliang Liu, Wei Zhou + Show 2 more

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https://doi.org/10.1155/2019/6454087

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Abstract

Porous copper fiber-sintered sheets (PCFSSs) with different porosities were fabricated through the solid-phase sintering method using cutting copper fibers. PCFSSs with the same porosity and different porosities were then joined via a fluxless soldering method. By analyzing the uniaxial tensile property of the PCFSSs, the formation mechanism of the soldered PCFSSs was investigated. The difference in the tensile properties between the soldered and original PCFSSs was examined. Experimental results indicated that, for the PCFSSs with homogeneous porosity, reducing the porosity increased the tensile strength and elongation at break significantly. The fluxless soldering method with the lead-free solder resulted in excellent joining of the PCFSSs with the same porosity and different porosities. Moreover, the final tensile strength of the soldered PCFSSs with the same porosity was nearly equal to that of their parent PCFSSs. The tensile strength of the soldered PCFSSs with different porosities depended on the higher-porosity section. After soldering the PCFSSs, Young’s modulus increased and the elongation at break reduced.

Highlights

With the development of precision manufacturing and material processing technology, porous metal materials are attracting considerable interest from researchers as novel structural and functional materials
To avoid damage to the Porous copper fiber-sintered sheets (PCFSSs) pore structure due to the high temperatures or pressures produced by melt welding or pressure welding, we proposed a fluxless soldering method for the joining of PCFSSs with different porosities
Microstructure Characteristics of PCFSSs. e pore-size distribution and surface morphology of PCFSSs with different porosities are shown in Figure 4. e copper bers were in a disordered arrangement and formed a large number of 3D interconnected pores with random irregular shapes. is can be attributed to the random lling of copper bers in the mold cavity. e lling and molding processes resulted in a 3D network structure with many contact points between the bers

Summary

Introduction

With the development of precision manufacturing and material processing technology, porous metal materials are attracting considerable interest from researchers as novel structural and functional materials. Clyne and Markaki fabricated porous stainless steel fiber-sintered sheets via the liquid-phase sintering method with copper powder as the connecting agent. The tensile strength of the stainless steel fiber-sintered sheets in the porosity range of 75%–95% was no higher than 1 MPa [9,10,11]. Zhou et al used 100 μm cutting copper fibers to fabricate PCFSSs via the solid-phase sintering method and systematically studied the effects of the sintering conditions (including the sintering temperature and time), fiber distribution, and porosity on the tensile strength [14,15,16]. Liu et al fabricated entangled steel wire materials with stainless steel fibers and investigated the pore structure, Young’s modulus, and tensile strength of the materials. By analyzing the pore structure and uniaxial tensile properties of the soldered PCFSSs, the soldering formation mechanism of the PCFSSs was investigated. e difference in the tensile properties between the soldered and original PCFSSs was examined

Experimental Procedures

Results and Discussion

Conclusions