Characterization of the thermal conductivity of EB-PVD ZrO2–Y2O3 coatings with a pulsed thermal imaging method

Jang, Byung-Koog; Sun, Jie; Kim, S. W.; Oh, Yoon Suk; Kim, H. T.

doi:10.1016/j.surfcoat.2012.06.055

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…It consists in inserting a heating probe between two identical pieces of the sample under study, and to measure the temperature variation, which is linked with the thermal conductivity, given with 5% accuracy. The values found are 0:96 W m À1 K À1 for the Erbium oxide part and 0:73 W m À1 K À1 for the Dysprosium oxide part, which are close to pure Zirconia values (typically between 1 and 2 W m À1 K À1 [23]). The resolution of the 1-D Fourier equation with the assumption of same radiative and convection losses on this sample gives a surface temperature difference between the two parts of 34°C for a 1000°C backside uniform heating.…”

Section: Thermal Conductivity Measurementsupporting

confidence: 61%

Quantitative temperature field measurements on a non-gray multi-materials scene by thermoreflectometry

Gilblas

Sentenac

Hernández

et al. 2014

Infrared Physics & Technology

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h i g h l i g h t s We evaluate experimentally a non-contact camera based temperature measurement method called thermoreflectometry. This method is based on a continuous evaluation of emissivity by reflectometry. A heterogeneous multi-materials scene composed of dielectrics and metals is elaborated and characterized by spectrometry. True temperature fields are retrieved on this complex scene and compared to reference methods.

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Section: Thermal Conductivity Measurementsupporting

confidence: 61%

Quantitative temperature field measurements on a non-gray multi-materials scene by thermoreflectometry

Gilblas

Sentenac

Hernández

et al. 2014

Infrared Physics & Technology

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“…The TBC density ( can be calculated directly from its heat capacity because the TBC's specific heat (c) is affected only by the material's composition and, thus, is a constant for these specimens. Based on a commonly used TBC-specific heat value, c = 480 J/kg•K [19,20], predicted TBC densities for the specimens (a)~(d) are listed in Table 1. Further, because the bulk density of 100% dense ZrO 2 -4mol%Y 2 O 3 material is also a constant,  s = 6.05 g/cm 3 , the porosities (1-/ s ) of these specimens can also be calculated as listed in Table 1.…”

Section: Thermal Properties By the Pti-mla Methodsmentioning

confidence: 99%

Thermal conductivity of ZrO2-4 mol%Y2O3 thin coatings by pulsed thermal imaging method

Jang

Sun

Kim

et al. 2015

Surface and Coatings Technology

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Thin ZrO 2-4mol% Y 2 O 3 coatings were deposited onto ZrO 2 substrates by electron beam-physical vapor deposition. The coated samples revealed a feather-like columnar microstructure. The main phase of the ZrO 2-4mol% Y 2 O 3 coatings was the tetragonal phase. To evaluate the influence of the coating's thickness on the thermal conductivity of thin ZrO 2-4mol% Y 2 O 3 coatings, the pulsed thermal imaging method was employed to obtain the thermal conductivity of the coating layer in the two-layer (coating and substrate) samples with thickness between 56 and 337 micrometers. The thermal conductivity of the coating layer was successfully evaluated and compared well with those obtained by the laser flash method for similar coatings. The thermal conductivity of coatings shows an increasing tendency with an increase in the coating's thickness.

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“…세라믹스 열차폐 코팅재의 코팅 방법으로서는 대기 플 라즈마 용사법(APS, atmospheric plasma spraying) [1][2][3][4] , 전 자 빔 물리적 증착법(EBPVD, electron beam physical vapor deposition) [5][6][7][8] , 감압 플라즈마 용사법(LPPS, low pressure plasma spray), 진공 플라즈마 용사법(VPS, vacuum plasma spray), 용액 전구체 플라즈마 용사법(SPPS, solution precursor plasma spray) [9][10] , 고속 화염 용사법(HVOF, high velocity oxygen fuel) 등 여러 가지 방법이 있으나, 설비 는 인자(factor)로 작용할 수 있음이 여러 문헌에서 보고 되고 있다. [11][12][13] 이러한 코팅용 분말을 제작하기 위한 공 정의 하나로서 분무 건조법(spray drying)에 의한 방법이 용사코팅을 위한 분말로서 폭넓게 활용되고 있다.…”

Section: 서 론unclassified

Fabrication and Characterization of Zirconia Thermal Barrier Coatings by Spray Drying and Atmospheric Plasma Spraying

Kim¹,

Heo²,

Kim³

et al. 2013

Journal of the Korean Ceramic Society

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In this study, we prepared yttria stabilized zirconia granules for thermal barrier coatings using a spray drying process. First, we characterized the properties of granules such as flow rate and packing density for utilizing the air plasma spray process. The flow rate and packing density data showed 0.732 g/sec and 2.14 g/cm 3 , respectively, when we used larger and denser particles, which are better than hollow granules or smaller spherical granules. Second, we chose larger, spherical granules fabricated in alcohol solvent as starting powders and sprayed it on the bondcoat/nimonic alloy by an atmospheric plasma spray process varying the process parameters, the feeding rate, gun speed and spray distance. Finally, we evaluated representative thermal and mechanical characteristics. The thermal expansion coefficients of the coatings were 11~12.7 × 10 −6 / o C and the indentation stress measured was 2.5 GPa at 0.15 of indentation strain.

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Characterization of the thermal conductivity of EB-PVD ZrO2–Y2O3 coatings with a pulsed thermal imaging method

Cited by 7 publications

References 25 publications

Quantitative temperature field measurements on a non-gray multi-materials scene by thermoreflectometry

Quantitative temperature field measurements on a non-gray multi-materials scene by thermoreflectometry

Thermal conductivity of ZrO2-4 mol%Y2O3 thin coatings by pulsed thermal imaging method

Fabrication and Characterization of Zirconia Thermal Barrier Coatings by Spray Drying and Atmospheric Plasma Spraying

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