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粉末性质对同轴送粉激光熔覆中粉末流场的影响规律

Effect of Powder Properties on the Convergence of Powder Stream in Coaxial Laser Cladding

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摘要

在同轴送粉激光熔覆过程中,粉末流是影响熔覆质量的重要因素。为了提高粉末流的汇聚性,考察粉末性质对粉末流场的影响,建立了同轴送粉激光熔覆粉末流数值模型。模拟计算了NiCoCrAlY、ZrO2、W三种典型粉末的粉末流形貌,并进行了粉末流的验证实验,实验结果与计算结果趋势吻合,说明模型具备合理性与可靠性。基于该模型,深入研究了粉末粒径、形状、密度和碰撞弹性恢复系数对粉末流汇聚的影响规律,在特定送粉工艺参数下,在粉末粒径增大时,汇聚焦距减小,汇聚浓度在一定粒径范围内达到最大值;在粉末形状系数或者密度增大时,汇聚焦距减小、汇聚浓度增大;在粉末颗粒的恢复系数减小时,汇聚焦距与汇聚浓度都增大。

Abstract

The powder stream has an important influence on the quality of coating in coaxial laser cladding. In order to improve the convergence of powder stream, a numerical model of powder stream in coaxial laser cladding is developed based on a given coaxial nozzle. Simulations of three kinds of powder stream, including NiCoCrAlY, ZrO2 ceramic powder and W powder, are calculated and validated by the experimental results. The effect of powder properties, including particle diameter, shape, density and restitution coefficient, on the convergence of powder stream is investigated. According to the calculated results with the same powder feeding parameters, as the particle diameter increases, the powder flow focal distance decreases, and the powder concentration reaches a maximum within some particle diameter scale. The powder concentration gets bigger and the powder flow focal distance becomes shorter with the powder shape factor or powder density increasing. As restitution coefficient decreases, both powder flow distance and powder concentration increase.

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中图分类号:TG456.7;TN249

DOI:10.3788/cjl201340.0503008

所属栏目:激光制造

责任编辑:宋梅梅  信息反馈

基金项目:国家自然科学基金重点项目(10832011)和面上项目(10972222)资助课题。

收稿日期:2013-01-04

修改稿日期:2013-02-18

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作者单位    点击查看

刘昊:中国科学院力学研究所先进制造工艺力学重点实验室, 北京 100190
虞钢:中国科学院力学研究所先进制造工艺力学重点实验室, 北京 100190
何秀丽:中国科学院力学研究所先进制造工艺力学重点实验室, 北京 100190
李少霞:中国科学院力学研究所先进制造工艺力学重点实验室, 北京 100190

联系人作者:刘昊(leonardo2008LH@163.com)

备注:刘昊(1985—),男,博士研究生,主要从事激光熔覆热防护涂层工艺等方面的研究。

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引用该论文

Liu Hao,Yu Gang,He Xiuli,Li Shaoxia. Effect of Powder Properties on the Convergence of Powder Stream in Coaxial Laser Cladding[J]. Chinese Journal of Lasers, 2013, 40(5): 0503008

刘昊,虞钢,何秀丽,李少霞. 粉末性质对同轴送粉激光熔覆中粉末流场的影响规律[J]. 中国激光, 2013, 40(5): 0503008

被引情况

【1】王艳萍,王茜蒨,马冲. 影响基于CCD相机激光光束宽度精确测量的因素. 中国激光, 2014, 41(2): 208002--1

【2】马广义,王江田,牛方勇,孙贝,吴东江. 粉末分布对激光近净成形Al2O3陶瓷薄壁件表面形貌的影响. 中国激光, 2015, 42(1): 103006--1

【3】王洪成,章维一,戴振东. 微米级球形金属粉体的稳定脉冲微输送. 光学 精密工程, 2015, 23(6): 1620-1626

【4】李娟,王善林,龚玉兵. 激光熔覆FeSiB非晶涂层工艺及组织. 中国激光, 2016, 43(1): 103006--1

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