Zirconates as new materials for thermal barrier coatings
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Zirconates as new materials for thermal barrier coatings
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| Creator |
Vasse, R
Cao, X Tietz, F Basu, Debabrata Stover, D |
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| Subject |
Engineering Materials
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| Description |
Zirconates with high melting points were investigated for
application as materials for thermal barrier coatings at operating temperatures >1300°C. SrZrO3, BaZrO3, and La2Zr2O7
powders were synthesized and sintered to compacts with
various levels of porosity. The sintering results indicated a promising low-sintering activity of the investigated materials. Thermal properties of these dense materials were determined. Thermal expansion coefficients were slightly lower than those of Y2O3-stabilized ZrO2 (YSZ); thermal conductivities of SrZrO3 and BaZrO3 were comparable or slightly higher than those of YSZ. La2Zr2O7 had a lower thermal conductivity. SrZrO3 was not suitable for application as a thermal barrier coating because of a phase transition at temperatures between 700° and 800°C. Mechanical properties (hardness, fracture toughness, and Young’s modulus) of dense BaZrO3 and La2Zr2O7 samples were determined by indentation techniques and showed lower hardness and Young’s modulus compared to YSZ. BaZrO3 and La2Zr2O7 powders were optimized for application as powders for plasma spraying. Plasma-sprayed coatings were produced and characterized. Thermal cycling with a gas burner at 1200°C showed a massive attack of the BaZrO3 coating, with loss of BaO. On the other hand, the La2Zr2O7 coating showed excellent thermal stability and thermalshock behavior.
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| Publisher |
Wiely / American Ceramic Society
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| Date |
2000
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/1248/1/debabrata'00.pdf
Vasse, R and Cao, X and Tietz, F and Basu, Debabrata and Stover, D (2000) Zirconates as new materials for thermal barrier coatings. Journal of the American Ceramic Society, 83 (8). pp. 2023-2028. ISSN 0002-7820 |
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| Relation |
http://cgcri.csircentral.net/1248/
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