Ceramic Coatings Deposited from Fine Particles by Different Spraying Processes
Ceramic Coatings Deposited from Fine Particles by Different Spraying Processes
复制标题
通过不同喷涂工艺从细颗粒沉积陶瓷涂层
DOI：
10.1007/s11666-020-01095-6
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发表时间：
2020
影响因子：
3.1
通讯作者：
J. Akedo
中科院分区：
文献类型：
--
作者：
M. Shahien;Masato Suzuki;K. Shinoda;J. Akedo
等离子喷涂的细颗粒有望形成均匀的微观结构，并改善陶瓷涂层的性能，因为其形成的小薄片具有较小的残余应力和孔径。尽管由于颗粒的流变性差（例如，低流动性和团聚性），喷涂细颗粒具有挑战性，但涂层的潜在改进使其成为一个有吸引力的选择。在这项研究中，我们通过三种不同的喷涂技术，即低功率直流（DC）等离子喷涂，轴向悬浮等离子喷涂（ASPS）和等离子辅助气溶胶沉积或混合气溶胶沉积（HAD），讨论了细颗粒喷涂的可行性。低功率直流等离子体足以在环境气氛中熔化和沉积细颗粒，而无需使用液体载体。制备的涂层具有与小片（直径5-8µm，无内部裂纹）的ASPS涂层相似的特征。低功率直流等离子体制备的涂层具有与传统等离子体喷涂涂层相当的性能，同时具有较低的能耗。通过HAD工艺沉积的细颗粒使涂层具有改善的微观结构，无孔隙或裂纹。在HAD过程中，沉积不需要颗粒熔化，等离子体有助于表面活化，提高了气溶胶沉积过程的沉积效率。与其他等离子喷涂技术相比，制备的HAD涂层具有更高的硬度、杨氏模量和粘附强度，并且没有孔隙或裂纹。此外，还分析了各种陶瓷微粒喷涂技术的异同。
Plasma spraying of fine particles promises uniform microstructure and improved properties for ceramic coatings due to the formation of small splats with reduced residual stress and pore size. Although spraying fine particles is challenging due to the poor rheological properties of particles (e.g., low flowability and agglomeration), the potential improvements to the coatings make it an attractive option. In this study, we discussed the feasibility of fine particle spraying via three different spraying techniques, namely low-power direct current (DC) plasma spraying, axial suspension plasma spraying (ASPS), and plasma-assisted aerosol deposition or hybrid aerosol deposition (HAD). Low-power DC plasma was sufficient to melt and deposit fine particles in an ambient atmosphere without using a liquid carrier. The fabricated coatings had similar features to those of ASPS coatings of small splats (5–8 µm in diameter without internal cracks). The fabricated coatings by the low-power DC plasma showed almost equivalent properties to that of the conventional plasma-sprayed coating while providing low energy consumption. Fine particles deposited via the HAD process led to the coatings with improved microstructure without pores or cracks. During the HAD process, particle melting was not required for deposition, and using the plasma assisted the surface activation and improved the deposition efficiency of the aerosol deposition process. The fabricated HAD coating revealed improved microstructure with the highest hardness, Young’s modulus, and adhesion strength and lack of pores or cracks compared to the coatings fabricated by other plasma spray techniques. In addition, similarities and differences among the techniques for spraying fine ceramic particles were investigated.
反应性大气等离子喷涂AlN涂层：铝原料粒度的影响
DOI：
--
发表时间：
2011
期刊：
Journal of Thermal Spray Technology Vol.20, No.3
影响因子：
--
作者：
M.Shahien;M.Yamada;T.Yasui;M.Fukumoto
通讯作者：
M.Fukumoto