A novel reverse-polarity plasma torch with extended hot-wall nozzle for atmospheric plasma spraying of dense yttria-stabilized zirconia coatings
A novel reverse-polarity plasma torch with extended hot-wall nozzle for atmospheric plasma spraying of dense yttria-stabilized zirconia coatings
复制标题
一种带有加长热壁喷嘴的新型反极性等离子炬，用于大气等离子喷涂致密氧化钇稳定氧化锆涂层
DOI：
10.1016/j.surfcoat.2022.128366
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发表时间：
2022-03
影响因子：
5.4
通讯作者：
Jin Yao
中科院分区：
文献类型：
--
作者：
Fangyuan Liu;Deping Yu;Yiwen Chen;Bin Duan;Jin Yao
大气等离子喷涂（APS）因其加热温度高、成本低等优点被广泛应用于陶瓷涂层的制备，但其涂层通常是由原料颗粒完全或部分熔化形成的堆积层片形成，不可避免地会产生气孔、未结合界面或裂纹等缺陷。因此，在本文中，提出了一种新的大气等离子喷涂技术，使用反极性等离子体炬（RPT）与延长热壁喷嘴充分熔化和加速原料颗粒制备致密的YSZ陶瓷涂层。首先，对RPT喷雾系统进行了详细设计，并对其主要电热特性进行了实验研究。结果表明，在相同输出功率下，RPT的电弧电压、热效率和电弧电压波动均优于传统的棒阴极/正极性等离子体炬（NPT）。其次，通过数值模拟研究了热壁喷嘴对等离子体射流温度场和速度场的影响。结果表明，热壁喷嘴的扩展使等离子体射流的高温高速区从反应堆出口向下游明显扩展。最后，采用扩展热壁喷嘴的反应烧结法成功制备了致密均匀的YSZ涂层，孔隙率约为5.3%。结果表明，与传统APS工艺相比，YSZ涂层组织致密，缺陷少。YSZ涂层的硬度和杨氏模量分别为11.9 ± 1.4GPa和197.9 ± 29.4GPa，高于传统APS工艺制备的涂层，与极低压等离子喷涂（VLPPS）工艺制备的涂层非常接近。
Due to the high heating temperature and low cost, atmospheric plasma spraying (APS) has been widely used in the preparation of ceramic coatings, but its coatings are normally formed by the stacked splats from fully or partially melted feedstock particles, which inevitably leads to some pores, unbonded interfaces or cracks. Thus, in this paper, a novel atmospheric plasma spraying technique using a reverse-polarity plasma torch (RPT) with extended hot-wall nozzle was proposed to fully melt and accelerate feedstock particles for the preparation of dense YSZ ceramic coatings. Firstly, the RPT spray system was designed in detail, and its main electro-thermal characteristics were experimentally studied. The results showed that the RPT exhibited higher arc voltage, thermal efficiency and lower arc voltage fluctuation than that of traditional rod-cathode/normal-polarity plasma torches (NPT) at the similar output power. Secondly, a numerical simulate was carried out to reveal the effect of the extended hot-wall nozzle on the temperature and velocity distributions of the plasma jet. The results showed that the extended hot-wall nozzle remarkably extended the high-temperature and high-velocity region of the plasma jet from the RPT exit to the downstream. Finally, the dense and uniform YSZ coatings with a porosity of about 5.3% were successfully prepared by the RPT with extended hot-wall nozzle. The results showed that the YSZ coating exhibited denser microstructure and fewer defects than that of the coating prepared by traditional APS process. Meanwhile, the hardness and Young's modulus of the YSZ coating were 11.9 ± 1.4 GPa and 197.9 ± 29.4 GPa, respectively, which were relatively higher than that of the coating prepared by traditional APS process, and were very close to that of the coating prepared by very low-pressure plasma spraying (VLPPS) process.
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影响因子：
5.4
作者：
E. Nogues;M. Vardelle;P. Fauchais;P. Granger
通讯作者：
E. Nogues;M. Vardelle;P. Fauchais;P. Granger
影响因子：
5.2
作者：
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通讯作者：
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影响因子：
3.1
作者：
Y. Wang;J. Legoux;Roberto Neagu;S. Hui;B. Marple
通讯作者：
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影响因子：
5.2
作者：
R. Ghasemi;R. Shoja-Razavi;R. Mozafarinia;H. Jamali
通讯作者：
R. Ghasemi;R. Shoja-Razavi;R. Mozafarinia;H. Jamali
影响因子：
5.4
作者：
C. Zhang;Wen-ya Li;M. Planche;Cheng-Xin Li;H. Liao;Chang-jiu Li;C. Coddet
通讯作者：
C. Zhang;Wen-ya Li;M. Planche;Cheng-Xin Li;H. Liao;Chang-jiu Li;C. Coddet