Microstructural and Mechanical Property Evolutions of Plasma-Sprayed YSZ Coating During High-Temperature Exposure: Comparison Study Between 8YSZ and 20YSZ

Yang, Guan-Jun; Chen, Zhenglong

doi:10.1007/s11666-013-9986-8

Cited by 77 publications

(27 citation statements)

References 40 publications

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“…It is obvious that the multiconnection‐induced fast sintering occurs primarily during the stage I (approximately 10 hour at 1300°C). However, the significant formation of monoclinic phase often needs an incubation period of ~150 hour at 1300°C . Therefore, it is reasonable to conclude that the multiconnection in the pore network is relatively unaffected by the phase change.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, the isothermal heat treatment has several advantages owing to its high‐temperature accuracy, ease of temperature control, as well as cost‐effective operation. On the other hand, regarding the long life time (eg, 8000‐16 000 h) of TBCs at their working temperatures (eg, ~1000°C), it is necessary to adopt a higher temperature to accelerate the sintering process. Therefore, in this study, the free‐standing coatings were isothermally heat treated in a furnace to 1000°C and 1300°C.…”

Section: Methodsmentioning

confidence: 99%

“…In real service condition, it may be extremely difficult to evaluate the sintering effect on the microstructural evolution, since the service environment can be very harsh. 29 it is necessary to adopt a higher temperature to accelerate the sintering process. Therefore, in this study, the free-standing coatings were isothermally heat treated in a furnace to 1000°C and 1300°C.…”

Section: Thermal Exposure Of Samplesmentioning

confidence: 99%

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A comprehensive sintering mechanism for TBCs‐Part I: An overall evolution with two‐stage kinetics

et al. 2017

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A comprehensive sintering mechanism for lamellar thermal barrier coatings was reported experimentally and theoretically in this study. To begin with, an overall property evolution with two‐stage kinetics was presented during thermal exposure. The increase in mechanical property at initial thermal exposure duration (stage‐I) was much faster with respect to that in the following longer duration (stage‐II). At the stage‐I, the in situ pore healing behavior revealed that the significant faster sintering kinetics was attributed to the rapid healing induced by multipoint connection at the intersplat pore tips, as well as a small quantity of the narrow intrasplat cracks. At the following stage‐II, the residual wide intersplat pore parts and the wide intrasplat cracks decreased the possibility of multiconnection at their counter‐surfaces, resulting in a much lower sintering kinetic. Moreover, a structural model based on the microstructure of plasma sprayed YSZ coatings was developed to correlate the microstructural evolution with mechanical property. Consequently, the model predicted a two‐stage evolutionary trend of mechanical property, which is well consistent with experiments. In brief, by revealing the pore healing behavior, this comprehensive sintering mechanism shed light to the structure tailoring toward the advanced TBCs with both higher thermal‐insulating effect and longer life time.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Thermal Exposure Of Samplesmentioning

confidence: 99%

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A comprehensive sintering mechanism for TBCs‐Part I: An overall evolution with two‐stage kinetics

et al. 2017

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“…During conventional atmospheric plasma spraying (APS), the powder is injected into a plasma jet to be melted, accelerated, and finally deposited onto the substrate surface in the form of lamellar splats (Ref [1][2][3]. It is well known that the temperature at the center of the plasma jet can be >10,000 K, which is much higher than the boiling point of any material.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Plasma Jet in Plasma Spray-Physical Vapor Deposition of YSZ Using a <80 kW Shrouded Torch Based on Optical Emission Spectroscopy

2015

Self Cite

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During plasma spray-physical vapor deposition (PS-PVD) of yttria-stabilized zirconia (YSZ) coatings, evaporation of the YSZ powder is essential, but quite difficult when using a commercial <80 kW plasma torch. In this study, a shrouded plasma torch was examined to improve the YSZ evaporation. The plasma characteristics were diagnosed using optical emission spectroscopy. Results showed that the electron number density in the plasma jet was maintained at an order of magnitude of 10 14 cm 23 , indicating local thermal equilibrium of the plasma jet. Compared with a conventional torch, the shrouded torch resulted in much higher plasma temperature and much lower electron number density. With the shrouded torch, more energy of the plasma was transferred to the YSZ material, leading to more evaporation of the YSZ powder and thereby a much higher deposition rate of the YSZ coating. These results show that use of a shrouded torch is a simple and effective approach to improve the evaporation of feedstock material during PS-PVD.

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“…Moreover, the sintering induced densification would raise the elastic modulus and, as a result, decrease the favourable strain tolerance of the coating. 4,5 To overcome the shortcoming of 8YSZ, the investigation for new candidate materials has accumulated lots of attention in the last decade. Several ceramic materials such as ZrO 2 -Y 2 O 3 -La 2 O 3 , 6 LaMgAl 11 O 19 , 7 La 2 Ce 2 O 7 , 8 LZO 9 have been evaluated as TBCs materials.…”

Section: Introductionmentioning

confidence: 99%

Splat interface bonding formation during plasma spraying of LZO coating

Liu

Yang

et al. 2014

Materials Research Innovations

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Plasma sprayed ceramic coatings of low thermal conductivity are becoming important candidates for next generation thermal barrier coatings. The rare earth ceramic materials are regarded as promising materials which can be applied by plasma spraying. However, the lower mechanical strength of these materials compared with YSZ limits their performance during thermal cycling. The interlamellar bonding of plasma sprayed ceramic coatings dominates their mechanical properties. In this study, the rare earth ceramic LZO splats were deposited on both YSZ and LZO surfaces at different surface temperatures to reveal the effect of the deposition temperature on the splat interface bonding formation. The bonding conditions between splat and different substrates were examined from the cross-sections by fracturing the splats. It is confirmed that at low surface temperature no effective splat bonding formed between the splat and the substrate surface. It is also observed that there was a critical surface temperature over which the interface bonding begins to form. The present results will benefit the control of splat interface bonding, and thus the properties of the coatings.

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Microstructural and Mechanical Property Evolutions of Plasma-Sprayed YSZ Coating During High-Temperature Exposure: Comparison Study Between 8YSZ and 20YSZ

Cited by 77 publications

References 40 publications

A comprehensive sintering mechanism for TBCs‐Part I: An overall evolution with two‐stage kinetics

A comprehensive sintering mechanism for TBCs‐Part I: An overall evolution with two‐stage kinetics

Characterization of Plasma Jet in Plasma Spray-Physical Vapor Deposition of YSZ Using a <80 kW Shrouded Torch Based on Optical Emission Spectroscopy

Splat interface bonding formation during plasma spraying of LZO coating

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