Thermal conductivity of EB-PVD ZrO2–4mol% Y2O3 films using the laser flash method

Jang, Byung Koog; Sakka, Yoshio; Yamaguchi, Norio; Matsubara, Hideaki; Kim, Hyun Jae

doi:10.1016/j.jallcom.2010.08.162

Cited by 25 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Fig. 9, the thermal conductivity by the present method is in good agreement with the results by the laser flash method [22]. Consequently, this result shows that the present method is a useful method for determining the thermal conductivity of coating layers from the combined coating and substrate specimens when it cannot be measured directly from separated coating layers with thinner thicknesses.…”

Section: Thermal Properties By the Pti-mla Methodssupporting

confidence: 84%

“…8 demonstrates clearly that the thermal conductivity increase in these specimens was due to the increase of the coating density. Figure 9 shows a comparison of TBC thermal conductivity measured in this study for various coating thicknesses by the present method and the laser flash method [22]. Despite some differences in thermal conductivity values, the general trends for both sets of data are essentially the same.…”

Section: Thermal Properties By the Pti-mla Methodsmentioning

confidence: 76%

See 1 more Smart Citation

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

Jang

Sun

Kim

et al. 2015

Surface and Coatings Technology

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Thermal Properties By the Pti-mla Methodssupporting

confidence: 84%

Section: Thermal Properties By the Pti-mla Methodsmentioning

confidence: 76%

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

Jang

Sun

Kim

et al. 2015

Surface and Coatings Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is evident from Fig. 3-6 that the quasi-column structured coating exhibits the highest porosity and defects among the investigated coatings, which would enhance the phonon scattering and reduce the phonon mean free path, thus leading to the low thermal conductivity [24,25]. In particular, the porosity between the feather-arm features in columnar coating is recognized as an important factor reducing the thermal conductivity [20].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Microstructure, thermal conductivity and thermal cycling behavior of thermal barrier coatings prepared by plasma spray physical vapor deposition

Gao

Guo

Wei

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

“…These may be broadly classified into two main categories: transient and steady state. Due to their short measurement time transient methods such as the line source [3][4][5], hot strip [6][7][8], plane source [9][10][11] and laser flash [12,13] methods have been widely used. A closely related method to the hot-wire and hot-strip techniques is the 3ω method [14] which uses a frequency based analysis to measure thermal conductivity rather than a temporal approach.…”

Section: Introductionmentioning

confidence: 99%

Novel method for thermal conductivity measurement through flux signal deconvolution

Badenhorst

Sandrock

2016

Journal of Energy Storage

View full text Add to dashboard Cite

Highlights• Transient heat flux technique for thermal properties of high conductivity solids.• Combining the use of two heat flux measurements with short heat impulse.• The fundamental model which describes the system is used as basis.• Optimization is used to fit the measured system impulse response.• Validated using two commercial metals, suitable for practical, composite systems. AbstractRapid thermal conductivity measurement of porous solids and composites remains a challenge. A modified steady state technique has been proposed which uses two heat flux sensors instead of one. The parameter estimation is achieved through the deconvolution of these signals and the identification of the system impulse response.A detailed derivation of the theoretically expected behaviour has been done, which provides a basis for fitting the measured impulse response. A six term expansion is required for the theoretical model to achieve full convergence. The unit requires a calibration step to measure the convective boundary condition. A signal validity check has been built into the approach through the use of the energy balance which detects any drift due to ambient losses or other factors. Through suitable choice of the mathematical algorithm rapid convergence of the non-linear fitting procedure is achieved. The parameter estimates of the standard test samples are excellent, with average errors of 2.3% for brass and 6.3% for aluminium. The system has several advantages in addition to the short measurement time, including low cost and no guard furnace or insulation requirement for room temperature measurements. The * Corresponding author. Tel: +27 12 420 4989. Fax: +27 12 420 2516. E-mail: carbon@up.ac.za 2 approach is suitable for measuring the overall behaviour of practical, composite systems.

show abstract

Thermal conductivity of EB-PVD ZrO2–4mol% Y2O3 films using the laser flash method

Cited by 25 publications

References 21 publications

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

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

Microstructure, thermal conductivity and thermal cycling behavior of thermal barrier coatings prepared by plasma spray physical vapor deposition

Novel method for thermal conductivity measurement through flux signal deconvolution

Contact Info

Product

Resources

About