Al_(2)O_(3)/Cu多孔复合材料的微观形貌和压缩性能  

Morphology and compressive properties of Al_(2)O_(3)/Cu porous composites

作　　者：杨腾 佟海云[2] 郑毅 储爱民 董泽熙 李滔 赵玉萍[3] YANG Teng;TONG Hai-yun;ZHENG Yi;CHU Ai-min;DONG Ze-xi;LI Tao;ZHAO Yu-ping(School of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Metrology Center of Inner Mongolia Baotou Steel Union Co Ltd,Baotou 014010,China;School of Civil and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学材料科学与工程学院,湖南湘潭411201 [2]内蒙古包钢钢联股份有限公司计量中心,内蒙古包头014010 [3]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《材料热处理学报》2023年第10期42-50,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52174344);湖南省自然科学基金(2023JJ30222,2021JJ30250);湖南省大学生创业训练项目(S202210534024X)。

摘　　要：采用高能球磨-粉末冶金法制备了Al_(2)O_(3)/Cu多孔复合材料(A-C-M)。首先利用高能球磨法将Cu粉和Al_(2)O_(3)粉末均匀细化,然后将Al_(2)O_(3)/Cu复合粉末与造孔剂尿素均匀混合后,再将混合粉末冷压成型,最后通过溶脱-烧结工艺制得A-C-M。采用X射线衍射(XRD)和扫描电镜(SEM)对粉末原料和A-C-M的微观形貌进行表征分析,使用万能试验机对A-C-M进行压缩性能测试,探讨了尿素和Al_(2)O_(3)含量对A-C-M性能的影响。结果表明:高能球磨使Al_(2)O_(3)/Cu复合粉末的形貌由球状变为片状,复合粉末尺寸先减小后增大,在球磨4 h时获得最小平均粒径为25μm;A-C-M含有两种特征孔,100~300μm的大孔和1~10μm的微孔;随尿素含量的增加,孔的连通程度及复合材料的孔隙率逐渐增加,其压缩强度逐渐降低;随Al_(2)O_(3)含量的增加,A-C-M孔隙率逐渐增加,其压缩强度逐渐降低,当Al_(2)O_(3)含量为4 mass%时,A-C-M的压缩强度急剧下降。Al_(2)O_(3)/Cu porous composites(A-C-M)were prepared using high-energy ball milling and powder metallurgy method.Firstly,the high-energy ball milling method was used to uniformly refine Cu powder and Al_(2)O_(3) powder.Then,the Al_(2)O_(3)/Cu composite powder was uniformly mixed with the pore-forming agent urea,and the mixed powder was cold pressed.Finally,A-C-M was prepared through the desolvation-sintering process.X-ray diffraction(XRD)and scanning electron microscopy(SEM)were used to characterize and analyze the morphology of powder raw materials and A-C-M,and the compressive properties of the A-C-M were tested using a universal testing machine.The effects of urea and Al_(2)O_(3) content on the properties of the A-C-M were discussed.The results show that the morphology of Al_(2)O_(3)/Cu composite powder changes from spherical to flake by high energy ball milling method,and the size of the composite powder first decreases and then increases.The minimum average particle size of 25μm is obtained after ball milling for 4 h.The A-C-M contains two types of characteristic pores,100-300μm large-pores and 1-10μm micro-pores.With the increase of urea content,the degree of pore connectivity and the porosity of the composites gradually increase,and its compressive strength gradually decreases.With the increase of Al_(2)O_(3) content,the porosity of the A-C-M gradually increases,and its compressive strength gradually decreases.When the Al_(2)O_(3) content is 4 mass%,the compressive strength of the A-C-M sharply decreases.

关 键 词：Al_(2)O_(3)/Cu多孔复合材料 高能球磨 微观形貌 压缩性能 尿素 

分 类 号：TB333[一般工业技术—材料科学与工程]