印刷工艺制备毛细芯的孔隙结构与性能  

Pore structure and properties of capillary wicks prepared by printing process

作　　者：申鹏 蔡颜玻 王德志[1] 刘新利 段柏华[1] SHEN Peng;CAI Yanbo;WANG Dezhi;LIU Xinli;DUAN Bohua(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2023年第3期233-243,共11页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51874368)。

摘　　要：以平均粒径为55~112μm的电解树枝状铜粉为原料、用尿素作为造孔剂,添加有机成分黏结剂、溶剂等有机物制备成浆料,采用印刷工艺制备毛细芯生坯,然后脱脂烧结制备厚度为(0.2±0.02)mm的毛细芯,研究铜粉粒径、尿素的加入和浆料有机成分对毛细芯孔隙结构和毛细性能的影响。结果表明,造孔剂尿素的加入可提高毛细芯结构的孔隙率、平均孔径和渗透率,降低毛细力和分形维数。随铜粉粒径从112μm减小到55μm,毛细芯的孔隙率、平均孔径、孔隙的平均面积和平均周长、分形维数等孔结构参数、以及毛细芯的渗透率和毛细特性参数均下降,分形维数由1.39下降至1.20,但毛细力上升。分形维数与渗透率相关,随渗透率下降,分形维数逐渐减小;毛细特性参数与渗透率成正比,与毛细力成反比。用112μm铜粉制备的毛细芯性能最优,其渗透率(K)为2.02×10^(-10)m^(2),毛细力(ΔPc)为1.29 kPa,毛细特性参数(ΔP_(c)·K)达到2.61×10^(-7)N。Using electrolytic dendritic copper powder with an average particle size of 55−112μm as raw material and urea as pore forming agent,adding organic component binder,solvent and other organic matter to prepare slurry,using printing process to prepare capillary wick green,and then degreasing and sintering to prepare capillary wick with thickness of(0.2±0.02)mm.The effects of copper powder particle size,urea addition and slurry organic components on the pore structure and capillary performance of the capillary wick were studied.The results show that the addition of poreforming agent urea can increase the porosity,average pore size and permeability of the capillary wick structure,and reduce the capillary force and fractal dimension.As the particle size of copper powder decreases from 112μm to 55μm,the porosity,average pore size,average area,average perimeter,fractal dimension,permeability and capillary performanca parameters of the capillary wick all decrease,while the capillary force increases,its fractal dimension decreases from 1.39 to 1.20.The fractal dimension is related to the permeability,and as the permeability decreases,the fractal dimension decreases gradually.Its capillary performanca parameters are directly proportional to permeability and inversely proportional to capillary force.The capillary wick prepared by 112μm copper powder has the best performance,the permeability is 2.02×10^(−10) m^(2),the capillary force(ΔP_(c))is 1.29 kPa,and the capillary performanca parameter(ΔP_(c)·K)reaches 2.61×10^(−7) N.

关 键 词：毛细芯 毛细性能 树枝状铜粉 印刷工艺 分形维数 渗透率 毛细力 

分 类 号：TG146.15[一般工业技术—材料科学与工程]