Effect of Preparation Methods on Pore Structure and Zinc Volatilization of Porous Cu60Zn40 Alloy
During the preparation process of metal porous materials,it is usually necessary to add pore-forming agents to regulate the pore structure.However,the removal of pore-forming agents takes a long time,and the residual pore-forming agents may contaminate or corrode the parent material.The impact of height compression ratio and sintering time on the pore structure of porous Cu60Zn40 alloy,prepared through uniaxial limited-pressure sintering without the addition of pore-forming agents,was thoroughly investigated.The findings reveal that the pore structure of the porous Cu60Zn40 alloy,fabricated via powder metallurgy without the addition of a pore-forming agent,is predominantly governed by the pressing conditions and sintering process.Elevating the compression ratio of the green compact height from 1.6 to 2.0 results in a substantial 48.15％reduction in porosity.Correspondingly,there is a notable decrease in maximum,average,and minimum pore diameters by 45.51％,46.72％,and 66.43％,respectively,with no significant alterations in pore morphology.Increasing the sintering time induces a shift towards more spherical pore shape,accompanied by pore shrinkage and modest adjustments in open porosity and pore size for the porous Cu60Zn40 alloy.Thus,the powder metallurgy approach for fabricating porous Cu60Zn40 alloy for the fine-tuning of open porosity and pore size by manipulating the height compression ratio,while optimizing pore morphology can be achieved through adjustments in sintering time.Furthermore,the zinc volatilization during sintering of the porous Cu60Zn40 alloy exhibits an inverse correlation with the high compression ratio and a direct correlation with the sintering time.This study provides reliable theoretical and technical support for the regulation of pore structure in metal porous materials without the addition of pore-forming agents,which is of significant theoretical and practical importance in the field of powder metallurgy for preparing metal porous materials.
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