冷喷涂颗粒回弹现象及沉积行为的模拟研究

doi:10.11890/1006-7191-111-43

Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (1): 43-53.DOI: 10.11890/1006-7191-111-43

冷喷涂颗粒回弹现象及沉积行为的模拟研究

周香林¹,巫湘坤²,王建国¹,张济山¹

1. 北京科技大学
2. 北京科技大学新金属材料国家重点实验室

收稿日期:2010-07-16 修回日期:2010-10-08 出版日期:2011-02-25 发布日期:2011-02-25
通讯作者: 巫湘坤

Numerical investigation of the rebounding and the deposition behavior of particles during cold spraying

Xianglin ZHOU, Xiangkun WU, Jianguo WANG, Jishan ZHANG

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Received:2010-07-16 Revised:2010-10-08 Online:2011-02-25 Published:2011-02-25
Contact: XianglinZHOU

摘要/Abstract

摘要： 冷喷涂颗粒碰撞沉积时会发生回弹，影响涂层质量，而对于回弹现象的研究报道较少。本文采用显示有限元软件ANSYS/LS-DYNA模拟研究颗粒碰撞时的回弹现象以及沉积行为，首先根据模拟结果提出了碰撞过程四阶段模型和碰撞应变分布模型，由此解释颗粒产生回弹的原因，然后分析了碰撞速度和材料特性对回弹现象的影响。结果表明，在50～1000m/s的范围内，随着碰撞速度增加，回弹系数先减小，达到最小值，然后开始增加。材料变形能力和密度是影响回弹现象的主要因素。

Abstract: Particles may rebound from a substrate surface during cold spraying, which affects the quality of the coating. In this paper, the rebound phenomenon and its consequences on deposition behavior have been analyzed using the finite element analysis software ANSYS/LS-DYNA version 970. In a range of particle velocities of 50--1000 m/s, increases of the impact velocity caused a rapid decline of the rebound coefficient R to a low point R_min. After that, R began to rise slowly. Then the effect of the impact velocities and material properties on the rebound phenomenon were analyzed. Both the material strength and density influenced this rebound phenomenon. Four stages of the impact process and a model of strain distribution were proposed in detail to explain the rebound phenomenon.

Key words: Deposition, Simulation, Bonding, Rebound phenomenon, Cold spray

中图分类号:

TG174.442

周香林巫湘坤王建国张济山. 冷喷涂颗粒回弹现象及沉积行为的模拟研究[J]. Acta Metallurgica Sinica (English Letters), 2011, 24(1): 43-53.

Xianglin ZHOU, Xiangkun WU, Jianguo WANG, Jishan ZHANG. Numerical investigation of the rebounding and the deposition behavior of particles during cold spraying[J]. Acta Metallurgica Sinica (English Letters), 2011, 24(1): 43-53.

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冷喷涂颗粒回弹现象及沉积行为的模拟研究

Numerical investigation of the rebounding and the deposition behavior of particles during cold spraying

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