Abstract
A particular YSZ feedstock for very low-pressure plasma spraying (VLPPS) has been designed which can be automatically divided into less than 5 μm YSZ molten particles in the long plasma jet. Fully molten particles were deposited on the substrate at different deposition distances of 250, 350 and 450 mm, respectively. The deposition behavior of less than 5 μm YSZ molten particles were studied aiming to obtain a thin gastight YSZ coating. The flattening ratio of particles at different deposition distances and the gas permeability of YSZ coating prepared by VLPPS were investigated. The results revealed that the thickness of flattened particles was about 0.10-0.35 μm and the flattening ratio of molten particles was about 4.7. The flattened particles were bonded well with substrates and the width of vertical cracks appeared in flattened particles was 0.01-0.02 μm. The gas permeability of coatings prepared at 350 mm was 1.5 × 10−7 cm4 (gf)−1 s−1.
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Acknowledgments
This work was supported by the National Key Research and Development Program of China (Basic Research Project, Grant No. 2017YFB0306100), the National Natural Science Foundation of China (Grant No. 91860114), and the National Key Research and Development Program of China (China-USA Intergovernmental Cooperation Project, Grant No. 2017YFE0105900).
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Gao, JT., Cheng, LX., Wang, YP. et al. Study on Deposition Behavior of Less Than 5 μm YSZ Particles in VLPPS. J Therm Spray Tech 29, 1708–1717 (2020). https://doi.org/10.1007/s11666-020-01087-6
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DOI: https://doi.org/10.1007/s11666-020-01087-6