烧结铜基多孔毛细芯的孔隙特征及性能  

Pore characteristic and performance of sintered copper-based porous wicks

作　　者：何达 汪琳[1] 刘如铁[1] 王铸博 熊翔[1] 邹俭鹏[1] HE Da;WANG Lin;LIU Rutie;WANG Zhubo;XIONG Xiang;ZOU Jianpeng(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2018年第4期389-397,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：国家国际科技合作专项(2015DFR50580)

摘　　要：以Na Cl为造孔剂,采用粉末冶金法制备具有高孔隙率的铜基多孔毛细芯材料,研究造孔剂粉末含量及粒度对毛细芯材料孔隙率、孔隙微观结构、等效孔径大小、渗透性能及抽吸性能的影响,并讨论孔隙结构、等效孔径及性能的关系。研究结果表明:随造孔剂含量增加,材料的孔隙率明显上升,材料内部的预制孔洞数量显著增加,使得许多预制孔洞相互贯通;减小造孔剂粒度会小幅度降低材料的孔隙率,同时使材料内部预制孔洞尺寸明显变小且分布趋向于均匀;毛细芯材料内部的间隙孔洞和预制孔洞可以组成不同类型的孔道,等效孔径大小与材料内部孔道结构及数量密切相关;通过改变造孔剂的含量和粒度,产生不同孔隙结构,可调控材料的等效孔径大小及分布;毛细芯的渗透性能及抽吸性能不仅仅由孔隙率决定,也与材料的孔结构、孔径大小及分布密切相关;孔隙率越高、平均等效孔径越小且孔径分布越集中的毛细芯,其毛细抽吸性能越好。Copper-based porous wicks were prepared by powder metallurgy using NaCl powders as pore forming agents.The effects of pore forming agent content and particle size on the porosity,pore structure,equivalent pore size,permeability and capillary pumping performance of porous wicks were investigated.The relationships among the pore structure,equivalent-pore-size and performances were discussed.The results show that,with increasing the pore forming agent content,the porosity of the porous wicks increases obviously,the number of prefabricated pores inside wicks increases significantly,which results in the connecting of prefabricated pores.With decreasing the particle size of pore forming agent,the porosity of the porous wicks reduces slightly,and the size of the prefabricated pores becomes smaller and the distribution tends to be uniform.Interstitial pores and prefabricated pores inside the wick can make up different types of pore channels.The equivalent pore size of wick is closely related to the structure and quantity of pore channels.By changing the content and particle size of the pore forming agent,different pore structure can be produced,and the equivalent pore size of the materials can be controlled.The permeability and capillary pumping performance of porous wicks is not only determined by porosity,but also by pore structure and pore size.Porous wicks with high porosity,small average equivalent pores size and concentrated pore size distribution show better capillary pumping performances.

关 键 词：铜基多孔材料 毛细芯 孔结构 等效孔径 抽吸性能 

分 类 号：TF124[冶金工程—粉末冶金]