高毛细效率纯铜毛细芯制备工艺研究  

Preparation on High Efficiency Pure Copper Capillary Wicks

作　　者：禹心祎 王林山 汪礼敏[1,2,3,4,5] Yu Xinyi;Wang Linshan;Wang Limin(GRIPM Advanced Material Co.,Ltd.Metals Powder Materials Industry Technology Research Institute,Beijing 101400,China;GRIPM Advanced Material Co.,Ltd,Beijing 101407,China;General Research Institute for N onferrous Metals,Beijing 100088,China;GRIPM Research Institute Co.,Ltd,Beijing 101407,China;Beijing M etal Powder Engineering Technology Research Center,Beijing 101400,China)

机构地区：[1]有研粉末新材料股份有限公司金属粉体材料产业技术研究院,北京101400 [2]有研粉末新材料股份有限公司,北京101407 [3]北京有色金属研究总院,北京100088 [4]北京有研粉末新材料研究院有限公司,北京101407 [5]北京金属粉末工程技术研究中心,北京101400

出　　处：《稀有金属》2023年第4期538-546,共9页Chinese Journal of Rare Metals

基　　金：国家重点研发计划项目(2021YFB3701902)资助。

摘　　要：为了有效提升纯铜毛细芯的毛细效率和传热极限,利用粉末冶金方法制备高毛细效率毛细芯。以氧化亚铜粉末为铜源在不同温度还原制成铜粉,研究了还原温度对铜粉性能的影响。铜粉经模压、烧结制备出了毛细芯,研究了不同还原铜粉、生坯孔隙率、烧结温度等因素对毛细芯孔隙率、最大孔径和渗透率等多孔性能的影响,并观察了还原铜粉和毛细芯的表面显微形貌。结果表明,600~850℃还原温度区间内,随着还原温度提高,铜粉粒度增大,粒度分布宽化,松装密度随之增加;在相同烧结条件下,毛细芯烧结后的最大孔径相比生坯有所增大,毛细芯的最大孔径及孔隙率随着还原铜粉粒度增大和生坯孔隙率(40%~55%区间内)增加而增加,在孔隙率和最大孔径同步增大的耦合作用下渗透率相应增大;600~800℃区间内,提高烧结温度导致烧结毛细芯的最大孔径增大、渗透率增加而孔隙率减小;采用600℃还原所制备的<28μm铜粉在700℃烧结,获得最大孔径2.4μm,孔隙率51.5%,渗透率1.353×10^(-13)m^(2)的高毛细效率纯铜毛细芯。Advanced capillary wicks design is one of effective ways to solve the heat dissipation problem on intelligent electronic equipment with increasing integration.In which,high permeability and high capillary pressure are the desired objectives to improve capillary efficiency.The capillary efficiency of sintered wicks is directly affected by the pore characteristics,which is supposed to be adjusted by molding and sintering process.In this work,controllable preparation of high efficiency copper powder sintered capillary wicks was realized by a powder metallurgy method.First,copper powder was obtained by heat treatment of cuprous oxide powder as copper source in reducing atmosphere at different reduction temperatures.And then,the effects of reduction temperature on the proper⁃ties of copper powder such as apparent density,particle size,particle size distribution and microstructure were investigated.In de⁃tails,the reduced copper powder was molded and then compressed uniaxial-bidirectionally to form green specimens with various poros⁃ities by adjusting the pressing force.The copper sintered wicks were eventually obtained by sintering the green specimens.Further⁃more,the effects of copper powder profiles,green specimens’porosity and sintering temperature on the porosity,maximum pore size and permeability of capillary wicks were explored.The surface microstructure of reduced copper powder and capillary wicks were ob⁃served by scanning electron microscope(SEM).The results showed that after heat treatment reduction above 600℃,cuprous oxide powder had completely transformed into copper without impurities detected by X-ray diffractometer(XRD).Moreover,in the process of transforming cuprous oxide powder into copper powder in the range of 600~850℃,the increase of reduction temperature led to the increase of copper powder particle size range from 8.819 to 21.840μm,which was attributed to the fact that the increase of tempera⁃ture makes more single particles agglomerate into secondary particles.However,there wa

关 键 词：毛细芯 粉末冶金 还原温度 最大孔径 孔隙率 渗透率 

分 类 号：TF124[冶金工程—粉末冶金] TF34[冶金工程—冶金物理化学]