The role of NZP additions in plasma-sprayed YSZ: microstructure, thermal conductivity and phase stability effects

Trice, Rodney W.; Su, Y. Jennifer; Faber, K. T.; Wang, Hsin; Porter, W.D.

doi:10.1016/s0921-5093(99)00468-2

Cited by 12 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 12 shows changes in thermal conductivity and elastic modulus of the coatings before and after thermal exposure. Some data in other references related to conventional coatings were also presented [17,24,28,29,31,50,51]. The thermal conductivity, which was measured at 1000 °C, of the FC-8YSZ, HS-8YSZ and composite coatings at sprayed status were found to be 0.80 W⋅m −1 K −1 , 0.76 W⋅m −1 K −1 and 0.44 W⋅m −1 K −1 , respectively.…”

Section: J U S T a C C E P T E Dmentioning

confidence: 78%

Tailoring sintering-resistant thermal barrier coatings by considering critical healing width of two-dimensional interlamellar pores

Liu¹,

Luo²,

Yang³

et al. 2023

Journal of Advanced Ceramics

View full text Add to dashboard Cite

Large degradation in thermal insulation and strain tolerance is a main headache and primary cause of failure for plasma-sprayed thermal barrier coatings (TBCs) during service. One mechanism behind such degradation is the healing of interlamellar pores formed by multiple connections between the edges of a pore, which significantly speeds up the healing during thermal exposure. The objective of this study is to obtain sintering-resistant TBCs by tailoring the width of interlamellar pores to avoid multiple connections. Firstly, mechanism responsible for the multiple connections was revealed. The splat surface before and after thermal treatments were characterized via atomic force microscopy. The roughening of the pore surface occurs during thermal exposure, along with grain growth inside the J u s t A c c e p t e d https://mc03.manuscriptcentral.com/jacer 2 splats. Consequently, local surface height increases, which causes multiple connections and healing of interlamellar pores. Secondly, critical widths of interlamellar pores to avoid multiple connections during thermal exposure is established by correlating the extent of surface roughening with the growth of individual grains. The height increase of the splat surface and growth of grain size were found to increase with the exposure temperature and duration. A relationship linking height increase and grain size growth induced by thermal exposure in plasma-sprayed ceramic splats was obtained. Finally, composite TBCs were prepared to form wide interlamellar pores in the coatings. Using this design, increases in thermal conductivity and elastic modulus can be prevented to a large extent. Thus, sintering-resistant TBCs that maintain a high thermal insulation and strain tolerance, even after long thermal exposure, can be created.

show abstract

Section: J U S T a C C E P T E Dmentioning

confidence: 78%

Tailoring sintering-resistant thermal barrier coatings by considering critical healing width of two-dimensional interlamellar pores

Liu¹,

Luo²,

Yang³

et al. 2023

Journal of Advanced Ceramics

View full text Add to dashboard Cite

show abstract

“…5 could also be attributed to the higher porosity observed in the 2Yb/7.6YSZ coating. A previous study by Trice et al 29 showed that a 2% increase in porosity resulted in an B0.1 J/m/K decrease in thermal conductivity. However, while the Ca 21 -doped samples have a larger concentration of oxygen vacancies and greater open porosity, they exhibited greater thermal conductivity as compared with the 7.6YSZ coating.…”

Section: (6) Thermal Conductivity Measurementsmentioning

confidence: 94%

Co‐Doping of Air Plasma‐Sprayed Yttria‐ and Ceria‐Stabilized Zirconia for Thermal Barrier Applications

Chen

Trice

Wang

et al. 2005

Journal of the American Ceramic Society

Self Cite

View full text Add to dashboard Cite

Co‐dopants of either Yb3+ or Ca2+ were incorporated into 7.6 mol% YO1.5–ZrO2 (7.6YSZ) and 12 mol% CeO2–ZrO2 (12CeSZ) coatings by infiltrating porous spray‐dried powders with salt solutions containing the appropriate co‐dopant species prior to plasma spraying. Co‐dopant concentration was varied from 2 to 5 mol%. Using a combination of transmission electron microscopy and energy‐dispersive analysis, no secondary phase or Yb3+ segregation was detected at the grain boundary of either as‐sprayed 2Yb/7.6YSZ or 2Yb/12CeSZ coatings. Dilatometer measurements showed that 2 mol% Yb3+ co‐doped 7.6YSZ and 12CeSZ coatings shrank ∼0.6% during a 5 h soak at 1400°C, approximately the same contraction as the baseline coatings (i.e. not co‐doped). X‐ray diffraction results show that the as‐sprayed 7.6YSZ, 2Ca/7.6YSZ, and 2Yb/7.6YSZ coatings comprised of non‐transformable, non‐equilibrium composition tetragonal ZrO2 (identified presently as t′‐ZrO2), while the 5Ca/7.6YSZ coating was a non‐equilibrium composition of cubic ZrO2. After a heat treatment of 100 h at 1200°C, the 2Yb/7.6YSZ coating was completely t′‐ZrO2, while the baseline and Ca2+ co‐doped 7.6YSZ coatings showed evidence of partitioning. Therefore, it appears that co‐doping of 7.6YSZ with 2 mol% Yb3+ increases the stability of t′‐ZrO2, whereas co‐doping with 2 mol% Ca2+ decreases the stability of t′‐ZrO2. The volume fraction of m‐ZrO2 in the baseline 12CeSZ coatings was estimated to be 88% after a 100 h heat treatment at 1200°C. 2 mol% Yb3+ or Ca2+ co‐doping limited the tetragonal to monoclinic phase transformation in 12CeSZ, with only 37% and 43% monoclinic phase observed, respectively, after a 100 h heat treatment at 1200°C; this was an improvement over the baseline 12CeSZ coating. As‐sprayed 2Yb/7.6YSZ and 2Yb/12CeSZ coatings had slightly lower thermal conductivity than their baseline counterparts in the as‐sprayed condition; after 100 h at 1200°C, their conductivity increased to that of the baseline coatings.

show abstract

“…This is also valid for the development of deposits with a combination of the properties of wear resistance and lubrication (Ramaswany et al, 1997;Gadow, & Scherer, 2001). However, if the deposit should keep just certain homogeneity of phase distribution, the co-spraying of powders allows the deposition of powders having different densities without the need for binders or pre-mix powder (Trice, 1999;Denoirjean, 2003). Another possibility for development of composite coatings is the co-precipitation of phases by melting and tempering of materials often immiscible each other (Colaizzi, 2000).…”

Section: Other Techniquesmentioning

confidence: 99%

The Influence of Dry Particle Coating Parameters on Thermal Coatings Properties

Cuenca-Álvarez¹,

Monterrubio-Badillo²,

Juárez-López³

et al. 2012

Advanced Plasma Spray Applications

View full text Add to dashboard Cite

The role of NZP additions in plasma-sprayed YSZ: microstructure, thermal conductivity and phase stability effects

Cited by 12 publications

References 20 publications

Tailoring sintering-resistant thermal barrier coatings by considering critical healing width of two-dimensional interlamellar pores

Tailoring sintering-resistant thermal barrier coatings by considering critical healing width of two-dimensional interlamellar pores

Co‐Doping of Air Plasma‐Sprayed Yttria‐ and Ceria‐Stabilized Zirconia for Thermal Barrier Applications

The Influence of Dry Particle Coating Parameters on Thermal Coatings Properties

Contact Info

Product

Resources

About