航空学报 > 2024, Vol. 45 Issue (12): 429316-429316   doi: 10.7527/S1000-6893.2023.29316

冷喷涂Ti涂层的颗粒变形行为及孔隙分布

周愁庭1,2, 马玉娥2(), 杨泽轩2, 李文亚3, 黄春杰4, 刘磊1,2   

  1. 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
  • 收稿日期:2023-07-12 修回日期:2023-08-14 接受日期:2023-09-11 出版日期:2023-11-14 发布日期:2023-09-27
  • 通讯作者: 马玉娥 E-mail:ma.yu.e@nwpu.edu.cn
  • 基金资助:
    国家自然科学基金中德国际合作与交流项目(52061135101)

Particle deformation behavior and pores distribution of cold sprayed Ti coatings

Chouting ZHOU1,2, Yu’e MA2(), Zexuan YANG2, Wenya LI3, Chunjie HUANG4, Lei LIU1,2   

  1. 1.AVIC The First Aircraft Institute,Xi’an  710089,China
    2.School of Aeronautics,Northwestern Polytechnical University,Xi’an  710072,China
    3.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an  710072,China
    4.Materials Technology,Helmut-Schmidt-University/University of the Federal Armed Forces Hamburg,Hamburg  22043,Germany
  • Received:2023-07-12 Revised:2023-08-14 Accepted:2023-09-11 Online:2023-11-14 Published:2023-09-27
  • Contact: Yu’e MA E-mail:ma.yu.e@nwpu.edu.cn
  • Supported by:
    Cooperation Project (NSFC-DFG) of the National Natural Science Foundation of China(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。

关键词: 冷喷涂, Ti涂层, CEL模型, 颗粒变形, 孔隙分布

Abstract:

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 temperatures. According to the experimental parameters, the Coupled Euler-Lagrange (CEL) model of random multi-particle 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.

Key words: cold spraying, Ti coating, CEL model, particle deformation, pores distribution

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