High-temperature oxidation and hot corrosion behavior of two kinds of thermal barrier coating systems for advanced gas turbines

Yoshiba, Masayuki; Abe, Keita; Aranami, T.; Harada, Yoshio

doi:10.1007/bf02645876

Cited by 29 publications

(8 citation statements)

References 8 publications

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“…16,17 Within the past few years, Japanese researchers have investigated the potential of materials based on the CaO-SiO 2 -ZrO 2 system for TBC applications. 18 They found superior oxidation behavior up to 1100°C, compared to YSZ. On the other hand, the new coatings were unstable under a corrosive environment.…”

Section: Introductionmentioning

confidence: 97%

Zirconates as New Materials for Thermal Barrier Coatings

Vaßen

Cao

Tietz

et al. 2000

Journal of the American Ceramic Society

1,185

477

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Zirconates with high melting points were investigated for application as materials for thermal barrier coatings at operating temperatures >1300°C. SrZrO 3 , BaZrO 3 , and La 2 Zr 2 O 7 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 Y 2 O 3 -stabilized ZrO 2 (YSZ); thermal conductivities of SrZrO 3 and BaZrO 3 were comparable or slightly higher than those of YSZ. La 2 Zr 2 O 7 had a lower thermal conductivity. SrZrO 3 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 BaZrO 3 and La 2 Zr 2 O 7 samples were determined by indentation techniques and showed lower hardness and Young's modulus compared to YSZ. BaZrO 3 and La 2 Zr 2 O 7 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 BaZrO 3 coating, with loss of BaO. On the other hand, the La 2 Zr 2 O 7 coating showed excellent thermal stability and thermal shock behavior.

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Section: Introductionmentioning

confidence: 97%

Zirconates as New Materials for Thermal Barrier Coatings

Vaßen

Cao

Tietz

et al. 2000

Journal of the American Ceramic Society

1,185

477

View full text Add to dashboard Cite

show abstract

“…An additional failure mechanism of the top coat is delamination caused by reaction of molten salts with the chemically more vulnerable bond coat after complete infiltration through the top coat. 12 As molten salts are usually found to penetrate through the thickness of the top coat in hot-corroded coatings, 13 all three mechanisms contribute to the failure of the coatings. The extent of the reaction and ingression of the melt, and hence the dominant failure mechanism, however, is determined by the composition of the molten salts.…”

Section: Introductionmentioning

confidence: 99%

Degradation of plasma-sprayed yttria-stabilized zirconia coatings via ingress of vanadium oxide

Chen

Mabon

Wen

et al. 2009

Journal of the European Ceramic Society

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“…However, the presence of voids has lead to decreasing corrosion resistance due to the penetration of species from the fuel (Yoshiba et al, 1996;Ogawa et al, 2001;Wu et al, 1989). YSZ containing $6-12 wt.% yttria has been mainly used giving acceptable thermal insulation (Ballard et al, 2003;Chen, 2006;Padture et al, 2002;Nicholls, 2003).…”

Section: Introductionmentioning

confidence: 99%

Laser sealing of zirconia–yttria–alumina plasma sprayed coating

Jasim

2013

Journal of King Saud University - Engineering Sciences

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The effect of a 2 kW CO 2 laser working at different laser and processing parameters on features, microstructure, chemical composition, phases, hardness and fracture toughness of plasma sprayed and laser sealed plasma sprayed coatings of yttria partially stabilized zirconia (YSZ) containing 8 wt.% alumina was investigated. The plasma sprayed (YSZ) material containing Al 2 O 3 (YSZAl) showed high hardness and fracture toughness compared with YSZ. Fine cells and dendrites were formed after laser sealing as observed from the upper surface views and transverse sections, respectively. The amount of voids and crack width associated with laser sealing was reduced significantly in YSZAl sealed coatings. The coarse heterogeneous distribution of a-Al 2 O 3 and metastable tetragonal (t 0 ) phases in the plasma sprayed coating is changed to a fine scale duplex structure of t 0 + a-Al 2 O 3 in the sealed coatings. No cubic (c), transformable tetragonal (t) and monoclinic (m) phases were found for plasma sprayed and laser sealed coatings processed under optimum laser conditions. The rapid solidification caused by laser treatment prevents the transformation of the high temperature c phase to transform to the t and m phases; only the t 0 phase is formed by displasive athermal transformation. The fracture toughness of the sealed coatings was observed to increase by a factor of three as compared to that of plasma as-sprayed coating.

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High-temperature oxidation and hot corrosion behavior of two kinds of thermal barrier coating systems for advanced gas turbines

Cited by 29 publications

References 8 publications

Zirconates as New Materials for Thermal Barrier Coatings

Zirconates as New Materials for Thermal Barrier Coatings

Degradation of plasma-sprayed yttria-stabilized zirconia coatings via ingress of vanadium oxide

Laser sealing of zirconia–yttria–alumina plasma sprayed coating

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