Cu-Al2O3复合粉末颗粒原位生成机制探究  

Study on In-situ Formation Mechanism of Cu-Al2O3 Composite Powder

作　　者：刘贵民 杜林飞 闫涛 惠阳 LIU Guimin;DU Linfei;YAN Tao;HUI Yang(Department of Equipment Support and Remanufacturing,Army Academy of Armored Forces,Beijing 100072,China)

机构地区：[1]陆军装甲兵学院装备保障与再制造系,北京100072

出　　处：《材料导报》2020年第8期31-35,共5页Materials Reports

基　　金：北京市自然科学基金(2152031)。

摘　　要：以Cu-Al合金粉末和CuO粉末为原料,采用反应球磨法制备了Cu-Al2O3复合粉末。通过扫描电镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)等设备,研究了球磨时间对粉末形貌、粒径、物相、晶粒尺寸和内应变的影响,探究了球磨过程中粉末组织的演变过程,揭示了纳米Al2O3颗粒的原位生成机制。研究结果表明:反应球磨的最终产物为Cu和Al2O3。纳米Al2O3颗粒的原位生成是一个受扩散控制的过程,球磨过程中粉末颗粒从椭球状先后变为层片状、等轴状,颗粒粒径先增大后减小,层间距不断减小,粉末晶粒不断细化,内应变逐渐增大,为原子的扩散提供了快速通道。同时,CuO在Cu-Al合金粉末中形成了无数扩散-反应偶,降低了反应激活能,促进了纳米Al2O3颗粒的原位生成。Cu-Al2O3 composite powder was obtained by ball milling,using Cu-Al alloy powder and CuO powder as the raw materials.The effect of milling time on powder particles’morphology,size,phase,crystalline size and internal strains were observed and analyzed by scanning electron microscope(SEM),X-ray diffraction(XRD)and transmission electron microscope(TEM),etc.Meanwhile,powder microstructure evolution during ball milling was investigated,and the in-situ formation mechanism of Al2O3 nanoparticles was revealed.The result showed that the final product of ball milling was Cu and Al 2O 3.The process of in-situ formation of Al2O3 nanoparticles is controlled by diffusion.With the increase of milling time,the powder particles shape changed from ellipsoid to laminar and equiaxial,particle size first increased and then decreased,interlamellar spacing decreased continuously,the powder grains refined and the internal strain increased gradually.These changes provide a fast-track for atom diffusion.At the same time,the CuO particles in Cu-Al alloy powder formed numerous diffusion-reaction couples to reduce the reaction activation energy and promote the in-situ formation of Al2O3 nanoparticles.

关 键 词：CU-AL2O3 反应球磨 粉末组织演变 颗粒原位生成机制 

分 类 号：TB333[一般工业技术—材料科学与工程]