喷雾干燥法制备Cu-Al_(2)O_(3)复合粉末及其复合材料的组织与性能  

Fabrication of Cu-Al_(2)O_(3)composite powder by spray drying and its microstructure and properties

作　　者：吴浩 甘雪萍[1] WU Hao;GAN Xueping(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》2023年第1期74-82,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(52071342)。

摘　　要：用Cu(NO_(3))_(2)·3H_(2)O和Al(NO_(3))_(3)·9H_(2)O为原料,通过喷雾干燥、焙烧、还原、球磨等制备Cu-Al_(2)O_(3)复合粉末,然后热压烧结制备块体Cu-Al_(2)O_(3)复合材料,最后通过热锻造实现进一步致密化。利用X射线衍射仪、扫描电镜和透射电镜等研究Cu-Al_(2)O_(3)复合粉末和块体复合材料的显微组织与形貌,并测试复合材料的抗拉强度和电导率。结果表明,Cu-Al_(2)O_(3)复合粉末呈片状,Al_(2)O_(3)分布均匀。烧结态复合材料的致密度较低,为95.4%,抗拉强度和导电率仅为306MPa和89.4%IACS。热锻处理后致密度提高至99.9%,抗拉强度和电导率分别提升至422 MPa和94.8%IACS;Al_(2)O_(3)颗粒以γ-Al_(2)O_(3)形态均匀分布于基体,晶界处颗粒较大(50~100 nm),晶内颗粒较小(10~20 nm)。Aluminum nitrate and copper nitrate were used to prepare Cu-Al_(2)O_(3)composite powders by spray drying,roasting,reduction and ball milling.Cu-Al_(2)O_(3)composites were prepared by hot pressing sintering,eventually the further densification of the materials were achieved by hot forging.The microstructure and morphology of the Cu-Al_(2)O_(3)composite powders and bulk materials were studied by X-ray diffraction scanning electron microscopy and transmission electron microscopy,the tensile strength and conductivity of the composite materials were also tested.The results indicate that the Cu-Al_(2)O_(3)composite powders are flake and the distribution of Al_(2)O_(3)is uniform.The sintered composites have a low density of 95.4%,the tensile strength and conductivity are only 306 MPa and 89.4%IACS.After hot forging,the density increases to 99.9%,the tensile strength and conductivity increase to 422MPa and 94.8%IACS.γ-Al_(2)O_(3)particles are uniformly distributed in the copper matrix:large-sized particles(50-100 nm)exist at grain boundaries and small-sized particles(10-20 nm)precipitates within grain boundaries.

关 键 词：弥散强化铜复合材料 喷雾干燥法 纳米氧化铝颗粒 热压烧结 热锻造 

分 类 号：TB333[一般工业技术—材料科学与工程]