Effect of gas pressure on thermal conductivity of zirconia thermal barrier coatings

A. Mogro-Campero; C. A. Johnson; P. J. Bednarczyk; R. B. Dinwiddie; H. Wang

doi:10.1016/S0257-8972(97)00485-4

Effect of gas pressure on thermal conductivity of zirconia thermal barrier coatings

A. Mogro-Campero, C. A. Johnson, P. J. Bednarczyk, R. B. Dinwiddie, H. Wang

Nuclear Energy Materials Microanalysis

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The thermal diffusivity of thermal barrier coatings (zirconia stabilized with 7-8 wt% yttria) deposited by air plasma spraying has been measured by the laser flash method. Free-standing samples (0.5-0.6-mm thick) polished on both sides were coated with graphite. Deduced values of thermal conductivity (e.g., 1.5 W m^-1 K^-1 at 200°C in 1 atm. of nitrogen) are in the range measured in other studies for this type of thermal barrier coating. The % increase in thermal conductivity in 1 atm. of gas compared to its value in vacuum was found to be about 10% in nitrogen at 500°C, close to a calculated value of 7% using a model in the literature. A simple extension of the model to higher temperatures and gas pressures predicts a significant rise, so that by 10 atm. of gas pressure the % increase would be 30% (with little sensitivity to temperature).

Original language	English
Pages (from-to)	102-105
Number of pages	4
Journal	Surface and Coatings Technology
Volume	94-95
DOIs	https://doi.org/10.1016/S0257-8972(97)00485-4
State	Published - Oct 1997

Funding

We are grateful to D. Gray, E. Moran, L. Szala and G. Adams for specimen preparation and advice, and to W. Nelson, P. DiMascio, K. Wilkes, W. Hasz, B. Nagaraj and T. Brown for helpful discussions and comments. The first three authors acknowledge support from DOE Cooperative Agreement Number DE-FC2 I-95MC3 1176, Advanced Turbine Systems Program - Phase 3. Work at ORNL is research sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by Lockheed Martin Energy Research Corp. for the US Department of Energy under contract DE-ACOS-96OR22464.

Funders	Funder number
Lockheed Martin Energy Research Corp.
Office of Transportation Technologies
US Department of Energy	DE-ACOS-96OR22464
U.S. Department of Energy	DE-FC2 I-95MC3 1176
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory

Keywords

Gas pressure
Thermal conductivity
Zirconia thermal barrier coatings

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10.1016/S0257-8972(97)00485-4

Cite this

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title = "Effect of gas pressure on thermal conductivity of zirconia thermal barrier coatings",

abstract = "The thermal diffusivity of thermal barrier coatings (zirconia stabilized with 7-8 wt% yttria) deposited by air plasma spraying has been measured by the laser flash method. Free-standing samples (0.5-0.6-mm thick) polished on both sides were coated with graphite. Deduced values of thermal conductivity (e.g., 1.5 W m-1 K-1 at 200°C in 1 atm. of nitrogen) are in the range measured in other studies for this type of thermal barrier coating. The % increase in thermal conductivity in 1 atm. of gas compared to its value in vacuum was found to be about 10% in nitrogen at 500°C, close to a calculated value of 7% using a model in the literature. A simple extension of the model to higher temperatures and gas pressures predicts a significant rise, so that by 10 atm. of gas pressure the % increase would be 30% (with little sensitivity to temperature).",

keywords = "Gas pressure, Thermal conductivity, Zirconia thermal barrier coatings",

author = "A. Mogro-Campero and Johnson, {C. A.} and Bednarczyk, {P. J.} and Dinwiddie, {R. B.} and H. Wang",

year = "1997",

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doi = "10.1016/S0257-8972(97)00485-4",

language = "English",

volume = "94-95",

pages = "102--105",

journal = "Surface and Coatings Technology",

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TY - JOUR

T1 - Effect of gas pressure on thermal conductivity of zirconia thermal barrier coatings

AU - Mogro-Campero, A.

AU - Johnson, C. A.

AU - Bednarczyk, P. J.

AU - Dinwiddie, R. B.

AU - Wang, H.

PY - 1997/10

Y1 - 1997/10

N2 - The thermal diffusivity of thermal barrier coatings (zirconia stabilized with 7-8 wt% yttria) deposited by air plasma spraying has been measured by the laser flash method. Free-standing samples (0.5-0.6-mm thick) polished on both sides were coated with graphite. Deduced values of thermal conductivity (e.g., 1.5 W m-1 K-1 at 200°C in 1 atm. of nitrogen) are in the range measured in other studies for this type of thermal barrier coating. The % increase in thermal conductivity in 1 atm. of gas compared to its value in vacuum was found to be about 10% in nitrogen at 500°C, close to a calculated value of 7% using a model in the literature. A simple extension of the model to higher temperatures and gas pressures predicts a significant rise, so that by 10 atm. of gas pressure the % increase would be 30% (with little sensitivity to temperature).

AB - The thermal diffusivity of thermal barrier coatings (zirconia stabilized with 7-8 wt% yttria) deposited by air plasma spraying has been measured by the laser flash method. Free-standing samples (0.5-0.6-mm thick) polished on both sides were coated with graphite. Deduced values of thermal conductivity (e.g., 1.5 W m-1 K-1 at 200°C in 1 atm. of nitrogen) are in the range measured in other studies for this type of thermal barrier coating. The % increase in thermal conductivity in 1 atm. of gas compared to its value in vacuum was found to be about 10% in nitrogen at 500°C, close to a calculated value of 7% using a model in the literature. A simple extension of the model to higher temperatures and gas pressures predicts a significant rise, so that by 10 atm. of gas pressure the % increase would be 30% (with little sensitivity to temperature).

KW - Gas pressure

KW - Thermal conductivity

KW - Zirconia thermal barrier coatings

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U2 - 10.1016/S0257-8972(97)00485-4

DO - 10.1016/S0257-8972(97)00485-4

M3 - Article

AN - SCOPUS:0031247990

SN - 0257-8972

VL - 94-95

SP - 102

EP - 105

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

ER -

Effect of gas pressure on thermal conductivity of zirconia thermal barrier coatings

Abstract

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Keywords

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