Journal
CERAMICS INTERNATIONAL
Volume 39, Issue 3, Pages 3447-3451Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.09.100
Keywords
Powders: chemical preparation; Thermal conductivity; ZrO2; Thermal applications
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Funding
- National Natural Science Foundation of China (NSFC) [50771013, 51231001]
- National Basic Research Program (973 Program) of China [2012CB625100]
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Multi-rare earth elements doping is one of effective methods to improve the phase stability and thermal barrier property of zirconia for thermal barrier coatings (TBCs) application. In this paper, the phase stability and thermo-physical properties of 7.5 mol% Sc2O3 and Gd2O3 co-doped ZrO2 (ScGdSZ) were investigated. ScGdSZ after 150 h heat-treatment at 1400 degrees C exhibited no monoclinic phase, showing high phase stability. The substitution of Sc2O3 with Gd2O3 increased the fraction of c-phase, however, t'-phase was still the dominant phase when the substitution amount was less than 2 mol%. The thermal conductivities of ScGdSZ gradually decreased with the increasing Gd2O3 proportion. 3.7 Sc2O3 and 3.7 Gd2O3 co-doped ZrO2 (in mol%) showed the lowest thermal conductivity, which. was 20% lower than 7.5 Sc2O3-doped ZrO2 and 40% lower than 4.5 Y2O3-doped ZrO2. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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