Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 16, Issue 5-6, Pages 804-808Publisher
SPRINGER
DOI: 10.1007/s11666-007-9079-7
Keywords
impurities; phase stability; plasma-sprayed thermal barrier coatings; sintering; thermal conductivity; thermal cyclic life; Young's modulus
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Funding
- Engineering and Physical Sciences Research Council [GR/R95364/01] Funding Source: researchfish
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It has been found that reducing the level of impurity oxides (particularly SiO2 and Al2O3) in 7YSZ, from about 0.2 wt% to below 0.1 wt% raises the sintering resistance and the phase stability of plasma-sprayed coatings. The implications for the usage of these coatings at elevated temperatures are examined. It is concluded that using relatively high-purity powder of this type is likely to confer substantial benefits in terms of the thermomechanical stability of the coatings under service conditions.
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