| 引用本文: | 李成新,刘森辉,张惠宇,李长久,李露,黄佳华,徐攀.新型大气长层流等离子体喷涂方法和研究进展[J].中国表面工程,2019,32(6):1~19 |
| LI Chengxin,LIU Senhui,ZHANG Huiyu,LI Changjiu,LI Lu,HUANG Jiahua,XU Pan.An Introduction and Progress of a Novel Atmospheric Laminar Plasma Spray Method[J].China Surface Engineering,2019,32(6):1~19 |
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| 摘要: |
| 介绍了一种新型大气等离子喷涂方法，该方法采用特殊内通道结构的直流非转移电弧等离子发生器，可以直接在大气条件下获得长度100~1000 mm之间变化的等离子射流。在大气条件下，等离子射流的流动特性具有“长、直、准”的层流或类层流状态，工作时噪音小于80 dB。在工作参数范围内，等离子射流的长度在固定总气流量条件下可以随输出功率的增加而增长；射流的长度在固定输出功率的条件下随总气流量的增加而减小。当使用在大气等离子喷涂技术中时，会为飞行粉末颗粒带来超长的加热和加速过程。文中详细介绍了大气层流等离子喷涂技术的研究历史和研究现状，以及研究团队利用该新型技术制备的6种涂层的显微结构、颗粒的飞行和加热特点，并对比了目前其他大气等离子喷涂技术的结果。结果表明，文中介绍的方法在最低的输出功率和气流量条件下，为金属和陶瓷颗粒提供了超长的飞行和加热条件，表现为较低的颗粒飞行速度和超高的颗粒表面温度。可以在不同的射流长度或喷涂距离下，获得不同的颗粒熔化状态或涂层结构，并发现可以直接在大气条件下获得大规模气液共沉积的涂层。 |
| 关键词: 层流等离子射流 大气等离子喷涂 陶瓷涂层 金属涂层 颗粒速度 |
| DOI：10.11933/j.issn.1007-9289.20190424001 |
| 分类号:TG174.442 |
| 基金项目:国家自然科学基金（91860114）；国家重点研发计划（2017YFB0306104）；国家建设高水平大学公派研究生项目（201806280354） |
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| An Introduction and Progress of a Novel Atmospheric Laminar Plasma Spray Method |
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LI Chengxin1, LIU Senhui1, ZHANG Huiyu1, LI Changjiu1, LI Lu2, HUANG Jiahua2, XU Pan2
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1.School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China;2.Zhenhuo Plasma Technology Co., Ltd., Chendu 610065, China
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| Abstract: |
| A novel atmospheric plasma spray method was proposed, using a newly development direct current non-transferred arc plasma torch which generated a long, stable and silent plasma jet in atmospheric environment without any other auxiliary equipment. The lengths of these plasma jets varied from 100 to 1000 mm in atmospheric environment. The fluid characteristics of plasma jets presented a laminar or quasi-laminar with a low-level noise less than 80 dB at the same time. Moreover, the lengths of the plasma jets increased with the increase of the output power at every constant gas flow rate and decreased with the increase of total gas flow rate at every constant output power, providing a super-long particle flight time in the atmospheric plasma spray process. The research history and current researches of these laminar plasma technologies are listed. The microstructure evolution, particle heating and motion were all presented by using six different types of powders. The effects of particle flowing characteristics to the formation of coatings were discussed. The results show a super long distance of particle heating and motion in the experiment when the system operates in a low output power and gas flow rate. Thus, low particle velocity and surface temperature are obtained. The variations of microstructures of the coatings and particle melting during the deposition can through different operation conditions, such as lengths of the plasma jet or spraying distances. Mass of vapor deposited coatings are obtained by using metallic or ceramic powders. |
| Key words: laminar plasma jet atmospheric plasma spray ceramic coating metallic coating particle velocity |
