等离子体喷涂涂层细观结构与工艺相关性研究
Relationship between mesoscopic structures of plasma sprayedcoatings and some process parameters of plasma spray
查看参考文献19篇
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文摘
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采用改进的颗粒沉积模型和一种新建议的循环算法，利用数值方法模拟了等离子体喷涂中涂层的生长过程及涂层的细观结构。数值模拟，主要包括了陶瓷液滴的高速变形与凝固、涂层材料的堆积、涂层中细胞空洞的形成与温度场的迭代计算等过程。研究结果表明，涂层中孔隙率的分布与一些关键工艺参数和基底表面状态等有关，液态陶瓷颗粒的直径和飞行速度的加大会引起涂层内孔隙率的增加，而基体温度和表面粗糙度的升高则有利于提高涂层的致密度。本文的研究结果将有助于定量或半定量地优化选取工艺参数以便获得所需的涂层结构和改善涂层的力学性能。 |
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其他语种文摘
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In order to facilitate the selection of process parameters and the improvement of mechanical properties of plasma spray coatings, growth and mesoscopic structure of plasma spray coatings were numerically investigated, by using the modified coating growth model and a new recursion algorithm. The numerical simulation consists of several main physical processes, such as impact deformation and solidificatiion of liquid ceramic drops, accumulation and growth of coatings, porosity formation, temperature distribution and evolution in coating system. A commercial FEM code, ANSYS v5.6 was adopted for the calculation of temperature fields in coatings and the growth processwas artificially divided into 10 steps. At the same time, 1000×1000 meshes were used to grasp the detailed mesoscopic structures in the coatings, and flying velocity, melting condition indicate that the relationship between the process parameters and the mesoscopic structure of coatinges in the coatings rose. However, when the temperature and the degree of roughness of the substrate were increased, the coatings were further cmpacted. |
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来源
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材料科学与工艺
,2003,11(2):113-119 【扩展库】
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关键词
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等离子体喷涂
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孔隙率
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涂层生长
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地址
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中国科学院力学研究所, 北京, 100080
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-0299 |
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学科
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化学 |
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基金
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国家自然科学基金
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中国科学院重点项目
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文献收藏号
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CSCD:1356112
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