Microstructure and properties of porous copper foams prepared from different copper powders
Porous copper foams were prepared by loose sintering water-air combination atomization copper pow-der and electrolytic copper powder at 700～900 ℃ for 120 min,respectively.Influence of the raw copper powders and the sintering temperature on the porosity,pore structure and properties of the sintered porous copper samples were investigated.The results show that with the increase of sintering temperature,the porosity of sintering sam-ples decreases.The porosity of sintered samples prepared from water-air combination atomized copper powders is about 30％-60％,with uniform morphology of pores,while the porosity of the sintered samples prepared from elec-trolytic copper powders is about 40％-70％,with irregular pore morphology.At the porosity of 50％,the initial yield strength and thermal conductivity of the sintered porous copper samples prepared from the atomized copper powder are 20.18 MPa and 59.13 W·m/K,respectively,while for the samples prepared from the electrolytic copper powder are 14.44 MPa and 41.32 W·m/K respectively.The sintered copper foam prepared from the atomized pow-der own better mechanical and thermal properties with similar porosity,which can be ascribe to the pore formation mechanism during the loose sintering process.
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