High-Performance Ceramic Coatings Sprayed via Novel Supersonic Plasma Spraying System
High-Performance Ceramic Coatings Sprayed via Novel Supersonic Plasma Spraying System
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DOI：
10.4028/www.scientific.net/kem.280-283.1203
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发表时间：
2004-12
期刊：
影响因子：
--
通讯作者：
S. Zhu;Bin-shi Xu
中科院分区：
文献类型：
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作者：
S. Zhu;Bin-shi Xu
研制了一种新型超音速等离子喷涂系统，其最大功率为80 kW，最大工作气量为6 m3/h，气体速度可达2400 m/s，粒子速度可达600 m/s。本文介绍了新型超声速等离子喷涂系统的设计，新型超声速等离子喷涂枪的结构包括特殊的拉瓦尔喷嘴作为单阳极和内供粉，以及超声速等离子射流的机理和对喷射颗粒的影响。对Al2O3、Cr2O3、ZrO2、Cr3C2、Co-WC等几种陶瓷粉末的喷涂工艺参数进行了优化。研究了喷涂陶瓷涂层的性能和显微组织。研究了采用新型超音速等离子喷涂技术喷涂纳米Al2O3-TiO2陶瓷涂层。新型超声速等离子喷涂技术与传统的空气等离子喷涂技术（Metco 9M）相比，大大提高了陶瓷涂层的质量，与大功率超声速等离子喷涂技术（Plazjet）相比，能耗和气体消耗更低，可以以低成本喷涂高性能陶瓷涂层。
A novel supersonic plasma spraying system was developed with a maximum power of 80 kW and a maximum working gas flow of 6 m3/h, at which gas and particle velocities of 2400 and 600 m/s can be achieved respectively. This paper deals with novel supersonic plasma spraying system design, the structure of novel supersonic plasma gun includes a special Laval nozzle as the single anode and inner powder supply, and the mechanisms of supersonic plasma jet as well as the effects on the sprayed particles. The spraying process parameters of several ceramic powders such as Al2O3, Cr2O3, ZrO2, Cr3C2 and Co-WC were optimized. The properties and microstructure of the sprayed ceramic coatings were investigated. Nano Al2O3-TiO2 ceramic coating sprayed by using novel supersonic plasma spraying was also studied. Novel supersonic plasma spraying improves greatly ceramic coatings quality compared with conventional air plasma spraying (Metco 9M), as well as it has lower energy and gas exhaustion compared with high power supersonic plasma spraying (Plazjet), which can spray high-performance ceramic coatings at low cost.