冷喷涂Ti涂层的颗粒变形行为及孔隙分布  

Particle deformation behavior and pores distribution of cold sprayed Ticoatings

作　　者：周愁庭 马玉娥[2] 杨泽轩 李文亚[3] 黄春杰 刘磊 ZHOU Chouting;MA Yu'e;YANG Zexuan;LI Wenya;HUANG Chunjie;LIU Lei(AVIC The First Aircraft Institute,Xi'an 710089,China;School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Materials Technology,Helmut-Schmidt-University/University of the Federal Armed Forces Hamburg,Hamburg 22043,Germany)

机构地区：[1]中国航空工业集团公司第一飞机设计研究院,西安710089 [2]西北工业大学航空学院,西安710072 [3]西北工业大学凝固技术国家重点实验室,西安710072 [4]德国汉堡赫尔穆特-施密特大学/德国联邦国防军大学材料技术研究所,汉堡22043

出　　处：《航空学报》2024年第12期296-308,共13页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金中德国际合作与交流项目(52061135101)。

摘　　要：在冷喷涂(CS)的沉积过程中,颗粒间结合强度较弱,涂层内普遍存在孔隙和颗粒间边界等缺陷。为研究这些缺陷的形成机制,在不同载流温度下,制备了3种不同粒度分布的Ti金属涂层;根据试验参数,建立随机多颗粒沉积的Coupled Euler-Lagrange(CEL)模型,计算获得了颗粒沉积后的变形情况及涂层内部的孔隙分布规律。结果表明,数值模拟和试验结果吻合良好。碰撞作用导致颗粒的累积呈现方向性,随着速度提高,颗粒的变形增大且内层颗粒受速度影响比外层颗粒更大。在相同参数下,大粒径颗粒沉积获得孔隙尺寸更大,孔隙率更高。在低速情况下,涂层内部的孔隙会相互连通形成孔簇,而随着临界速度比增大,孔隙率降低。In the deposition process of Cold Spraying(Cs),the bonding strength between particles is small,and defectsas pores and interparticle boundaries are common in the coatings.In order to study the formation mechanism of these defects,three kinds of Ti coatings with different particle sizes distributions were prepared at different airflow tem-peratures.According to the experimental parameters,the Coupled Euler-Lagrange(CEL)model of random multiparticle deposition was established,and the deformation of particles after deposition and the pores distribution law inside the coatings were calculated.The results showed that the numerical simulation and experimental results were in good agreement.The collision action causes the accumulation of particles to be directional,and with the increase of velocities,the deformation of particles increases,and the inner particles are more affected by the velocities than the outer particles.Under the same parameters,the deposits with large particles have larger pores and higher porosities.At low velocities,the pores inside the coatings communicate with each other to form pore clusters,and as the velocities increase,the pore sizes decrease and the porosities decrease.

关 键 词：冷喷涂 Ti涂层 CEL模型 颗粒变形 孔隙分布 

分 类 号：V261.93[航空宇航科学与技术—航空宇航制造工程]