DataVXAdvances in Applied CeramicsPaper
journal article·2019-04-03

Thermal properties of La 2 Zr 2 O 7 double-layer thermal barrier coatings

Xingye Guo, Zhe Lu, Hye-Yeong Park, Li Li, James Knapp, Yeon-Gil Jung, Jing Zhang

Advances in Applied Ceramics· Volume 118· Issue 3
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Source abstract

Abstract

La2Zr2O7 is a promising thermal barrier coating (TBC) material. In this work, La2Zr2O7 and 8YSZ-layered TBC systems were fabricated. Thermal properties such as thermal conductivity and coefficient of thermal expansion were investigated. Furnace heat treatment and jet engine thermal shock (JETS) tests were also conducted. The thermal conductivities of porous La2Zr2O7 single-layer coatings are 0.50–0.66 W m−1 °C−1 at the temperature range from 100 to 900°C, which are 30–40% lower than the 8YSZ coatings. The coefficients of thermal expansion of La2Zr2O7 coatings are about 9–10 × 10−6 °C−1 at the temperature range from 200 to 1200°C, which are close to those of 8YSZ at low temperature range and about 10% lower than 8YSZ at high temperature range. Double-layer porous 8YSZ plus La2Zr2O7 coatings show a better performance in thermal cycling experiments. It is likely because porous 8YSZ serves as a buffer layer to release stress.
Source: openalex_inverted_index · Quality: baseline

Research context

Materials processing

OpenAlex topics: High-Temperature Coating Behaviors · Nuclear Materials and Properties · Particle Dynamics in Fluid Flows

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Mechanical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA

College of Materials Science and Engineering, Beijing University of Technology, Beijing, People’s Republic of China

School of Materials and Metallurgical Engineering, University of Science and Technology Liaoning, Anshan, People’s Republic of China

School of Materials Science and Engineering, Changwon National University, Changwon, Republic of Korea

Praxair Surface Technologies, Indianapolis, IN, USA

Funding

U.S. Department of Energy · Indiana University – Purdue University Indianapolis · International Research Development Fund · Korea Institute of Energy Technology Evaluation and Planning · Ministry of Trade, Industry & Energy, Republic of Korea · National Nature Science Foundation of China

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