Development of Porous YSZ Coatings with Modified Thermal and Optical Properties by Plasma Spray Physical Vapor Deposition

Kambara, Makoto; Shinozawa, Akihiro; Aoshika, Kiyoshi; Eguchi, Koichi; Yoshida, Toyonobu

doi:10.1299/jmmp.4.94

Cited by 12 publications

(2 citation statements)

References 21 publications

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“…The maximum powder feeding rate for complete decomposition of 15 -lm ZrO 2 particles under the condition similar to that of the present work is numerically evaluated to be around 10 g/min. 16 Although the minimum enthalpy necessary for decomposition of ZrO 2 is 1053 kJ/mol and is greater than that of Si (521 kJ/mol), the enthalpy per weight for decomposition of Si (17.9 kJ/g) becomes nearly twice as large as that for ZrO 2 because of the lighter molar weight of Si. That is, a larger thermal load will be applied by Si than ZrO 2 at a certain fixed feeding rate.…”

Section: B Formation Mechanism Of the Nano-composite Si Powdersmentioning

confidence: 98%

Nano-composite Si particle formation by plasma spraying for negative electrode of Li ion batteries

Kambara

Kitayama

Homma

et al. 2014

Journal of Applied Physics

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Nano-composite silicon powders have been produced at a maximum process throughput of 6 g/min by plasma spraying with metallurgical grade silicon powder as raw material. The obtained powders are found to be fundamentally composed of crystalline silicon particles of 20-40 nm in diameter, and are coated with an $5-nm-thick amorphous carbonous layer when methane gas is additionally introduced during plasma spraying. The performance of half-cell batteries containing the powders as negative electrodes has shown that the capacity decay observed for the raw Si coarse particles is significantly improved by plasma treatment. The carbonous coating potentially contributes to an improvement in capacity retention, although coexisting SiC particles that inevitably form during high-temperature processing reduce the overall capacity. V C 2014 AIP Publishing LLC.

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Section: B Formation Mechanism Of the Nano-composite Si Powdersmentioning

confidence: 98%

Nano-composite Si particle formation by plasma spraying for negative electrode of Li ion batteries

Kambara

Kitayama

Homma

et al. 2014

Journal of Applied Physics

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“…LPPS, PS-PVD 具有更低的工作压力、更高的喷涂功率和更大的工作气体流量, 从而可以实现气液固多相沉积 [5][6][7][8][9] 。通过 PS-PVD 气相沉积制备的热障涂层具有优异的隔热和抗热震性能, 使其成为未来最有前景的先进发动机热障涂层制备技术之一 [10][11][12][13][14][15][16] 。随着工艺研究的深入, 涂层性能的提升遇到瓶颈, 依靠单纯的工艺摸索来改变涂层的结构或提升涂层的性能已非常困难 , 因此需要进一步了解 PS-PVD 沉积机理, 依靠理论指导工艺实践, 提高研究效率, 从而更快推动 PS-PVD 走向产业化应用。 Mauer 等 [17][18][19][20] 提出了基于沉积速率与基体温度的 PS-PVD 区域结构模型。Gao 等 [21][22][23] 研究了不同轴向和径向涂层结构, 归纳出五种典型的 PS-PVD 涂层结构, 并解释其形成原因。广东省新材料研究所的 Zhang 等 [24][25] ΔG 增加, 系统总的自由能变化满足式(1) [30] ：…”

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Deposition Mechanism Based on Plasma Spray-Physical Vapor Deposition

Zi-Qian¹,

Liu²,

Mei³

et al. 2017

Journal of Inorganic Materials

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Thermal barrier coatings (TBCs) were prepared via plasma spray-physical vapor deposition (PS-PVD) technique at five spray distances by using agglomerated ZrO 2 -7wt%Y 2 O 3 (7YSZ) powders. The microstructure and phase composition of these coatings under different spray distances were analyzed by field emission-scanning electron microscope (FE-SEM) and X-ray diffraction (XRD). Besides, gas concentration of the powders in plasma jet was diagnosed with stand-off distances by Optical Emission Spectroscopy (OES). Eventually, three formation mechanisms of the PS-PVD coatings based on vapor deposition were proposed, and the relationship between the concentration of gas phase and the microstructure of the coatings was explained. The results reveal that: (1) the coatings prepared at spray distance of 350 mm and 1800 mm exhibit dense structure, while typical PS-PVD 7YSZ columnar coatings were formed at spraying distance of 650-1250 mm; (2) the coating formed at 350 mm spraying distance is composed oft-and m-ZrO 2 , and others are mainly composed of t-ZrO 2 at over 650 mm stand-off distance;(3) At 350 mm spray distance, the coating is developed under the combination effect of the supersaturated spontaneous nucleation from high concentration of the gas phase and liquid/solid particles. At spraying distance of 650-1250 mm, the growth of columnar coatings are dominated by the non-spontaneous nucleation after the deposition of gas phase on the substrate, and supplemented by spontaneous nucleation in plasma jet. At spraying distance of 1800 mm, the coating is accumulated from spontaneous re-solidified gas phase particles.

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Feather-like Structured YSZ Coatings at Fast Rates by Plasma Spray Physical Vapor Deposition

et al. 2009

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A variety of yttria-stabilized zirconia (YSZ) coatings have been attained by plasma spray physical vapor deposition (PS-PVD) with fine YSZ powders at high power. The coating structures were found to change significantly with the powder feeding rates but less with the substrate temperature and the rate of the substrate rotation, and a porous feather like structure was attained at 500 Torr (666.6 millibar) and a rate of >200 lm/min. Such a coating produces porosity reaching >50%, thermal conductivity as small as 0.5 W/mK and lower infra-red transmittance compared to the sprayed splat coating with identical thickness.

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Development of Porous YSZ Coatings with Modified Thermal and Optical Properties by Plasma Spray Physical Vapor Deposition

Cited by 12 publications

References 21 publications

Nano-composite Si particle formation by plasma spraying for negative electrode of Li ion batteries

Nano-composite Si particle formation by plasma spraying for negative electrode of Li ion batteries

Deposition Mechanism Based on Plasma Spray-Physical Vapor Deposition

Feather-like Structured YSZ Coatings at Fast Rates by Plasma Spray Physical Vapor Deposition

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