DataVXAdvances in Applied CeramicsPaper
journal article·2019-07-04Open access

Mechanical properties of lanthanum zirconate-based composite thermal barrier coatings

Jing Zhang, Xingye Guo, Yi Zhang, Zhe Lu, Hyun-Hee Choi, Yeon-Gil Jung, In-Soo Kim

Advances in Applied Ceramics· Volume 118· Issue 5
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Source abstract

Abstract

Lanthanum zirconate is a promising candidate material for thermal barrier coating (TBC) applications due to its low thermal conductivity and high temperature phase stability. However, its application is limited by thermal durability caused by low fracture toughness and low coefficient of thermal expansion. We recently developed LZ/8YSZ composite TBC systems using blended LZ and 8YSZ powders, which have demonstrated excellent thermal cycling performance. In this study, the mechanical properties of the composite TBCs were characterised using both nanoindentation and Vicker’s microhardness tests. The nanoindentation results show that both Young’s modulus and nanohardness increase with increasing 8YSZ content, suggesting the mechanical properties can be tailored by changing the volume ratio of 8YSZ. The ratios of Young’s modulus to nanohardness remain constant, ∼18, irrespective to the coating’s composition. The microhardness results show the same dependence with 8YSZ content, which is confirmed by the analytic models based on composite theory.
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Research context

NanomaterialsComposites

OpenAlex topics: High-Temperature Coating Behaviors · Flame retardant materials and properties · Nuclear materials and radiation effects

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

Affiliations

Department of Mechanical and Energy Engineering, Indiana University – Purdue University Indianapolis, Indianapolis, IN, USA

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

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

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

High Temperature Materials Research Group, Korea Institute of Materials Science, Changwon, Gyeongnam, Republic of Korea

Funding

U.S. Department of Energy · Indiana University-Purdue University Indianapolis · Korean Institute of Materials Science · Korea Institute of Energy Technology Evaluation and Planning · Ministry of Trade, Industry & Energy, Republic of Korea · Technology Innovation Program · Ministry of Knowledge Economy · National Natural Science Foundation of China

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