Improve durability of plasma-splayed thermal barrier coatings by decreasing sintering-induced stiffening in ceramic coatings

Huang, Jibo; Wang, WeiZe; Li, YuanJun; Fang, Huanjie; Ye, Dongdong; Zhang, Xian-cheng; Tu, S.T.

doi:10.1016/j.jeurceramsoc.2019.11.074

Cited by 41 publications

(18 citation statements)

References 41 publications

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“…Some sintering-resistant coatings were often related to the pore structure design [52][53][54], the underlying mechanism can be revealed based on the above results. The increases in thermal conductivity and elastic modulus of the conventional coatings were found to be much higher than that of the composite coating.…”

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

confidence: 89%

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

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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.

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

confidence: 89%

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

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“…Sintering-related performance degradation is a primary source of concern for TBC durability. The problem is worsening as turbine entrance temperatures continue to rise [19][20][21]. Sintering and densification of the YSZ topcoat occur at temperatures as low as 1000 °C and become apparent at temperatures beyond 1200 °C [22,23].…”

Section: Counteracting the Sintering Effects By The Nanostructurementioning

confidence: 99%

Progress update on extending the durability of air plasma sprayed thermal barrier coatings

Luo

Chen

Zhou

et al. 2022

Ceramics International

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“…26,[30][31][32] The results have indicated that the EMAP coating, as a potential TBC structure, exhibits anti-sintering properties and thus maintains good strain tolerance over time, and its lifetime is superior to those of conventional and nanostructured APS TBCs. 26,33 The microstructural characteristics, especially those of the embedded particles, are primarily responsible for the excellent performance of the EMAP coatings. However, the influence of porous MA particles on the sintering performance of the coating is not comprehensively understood.…”

Section: Introductionmentioning

confidence: 99%

Investigation of sintering mechanism for novel composite structural thermal barrier coating

et al. 2023

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A micro‐agglomerated particle embedded–thermal barrier coating (TBC) structure was prepared by an improved plasma spray process to withstand the sintering‐induced degradation of TBCs during service. In this study, the sintering resistance and thermophysical and mechanical properties of conventional and novel‐structured TBCs were systematically characterized. The results suggested that the thermal conductivity and sintering shrinkage of the novel‐structured TBCs were approximately 30% lower than those of conventional air plasma spraying TBCs. The elastic modulus of the novel‐structured coating is only 32% of that of the conventional structure after thermal exposure at 1300°C for 100 h. The distinct structure of the coating is the main factor that influences its performance. The relationship between the structural evolution and residual strain of the coating was analyzed using electron backscatter diffraction and transmission electron microscopy. Significant differences were observed in the sintering behavior of the dense matrix and embedded particle regions in the coating. Some columnar grains near the intersplat pores in the dense matrix have similar lattice orientations, and they tend to connect and consequently heal the intersplat pores. The large pores between the agglomerated particles and non‐oriented submicron‐sized grains that constitute these particles are responsible for the sintering resistance of the coating.

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Improve durability of plasma-splayed thermal barrier coatings by decreasing sintering-induced stiffening in ceramic coatings

Cited by 41 publications

References 41 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

Progress update on extending the durability of air plasma sprayed thermal barrier coatings

Investigation of sintering mechanism for novel composite structural thermal barrier coating

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