Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7992547 | Journal of Alloys and Compounds | 2018 | 16 Pages |
Abstract
To improve the protective temperature of thermal barrier coatings (TBCs), different Eu-doping ratios of La2Zr2O7 with pyrochlore structure, which are more stable in thermodynamics, were synthesized by coprecipitation-calcination method. Phase structure, grain growth kinetics, bond strength, thermo-physical properties of the doped La2Zr2O7 were investigated under different doping ratios. The results show that nano-sized doped La2Zr2O7 grains (<100â¯nm) grow rapidly under elevated synthesis temperature. Meanwhile the increasing Eu3+ ions lead to more imperfects, changes of bond strength, and slight disorder of the lattice. The coefficient of thermal expansion (CTE) of Eu-doped La2Zr2O7 is notably improved as Eu3+ ions increase. The thermal conductivity decreases at initial period and increases afterwards, which reaches the lowest value for the composition of (La0.6Eu0.4)2Zr2O7.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Renbo Zhu, Jianpeng Zou, Duopei Wang, Ke Zou, Di Gao, Jie Mao, Min Liu,