Toward Durable Thermal Barrier Coating with Composite Phases and Low Thermal Conductivity

Ma, Xinqing; Rivellini, Kristina; Ruggiero, Peter; Wildridge, George

doi:10.1007/s11666-020-00979-x

Cited by 9 publications

(11 citation statements)

References 22 publications

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“…Further, Mahade et al studied the erosion performance of gadolinium zirconate (GZO) and its composite TBCs produced by suspension plasma spray (SPS) (Ref 15 - 17 ), and found that material composition and microstructural design had major impact on their erosion behaviors. In most of the cases, the increase in YSZ content and coating density for those TBCs showed better erosion resistance, which is consistent with our finding in previous study related (Ref 7 ). Our current research will focus on erosion behavior and mechanism of composite phase TBCs.…”

Section: Introductionsupporting

confidence: 92%

“…With the special BRT setup and the experimental observation in present work, it is believed that the spallation of the TBCs was initialized on the edge areas due to highly concentrated thermal stress during the early cycling time, nominally less than 1000 cycles. This kind of TBC’s edge spallation is often observed on disk-like specimens (Ref 7 ). With the progress of the thermal cycling, micro-cracking started to grow and propagate radically within the splats and laterally along the splat boundaries (Fig.…”

Section: Resultsmentioning

confidence: 67%

“…This multiple-mode porosity structure is beneficial for lowering thermal conductivity of the TBC and enhancing strain tolerance. The sintering at 1300 °C for approximate 100 h had proven that the sintering affected the TBC porosity mostly on the splat boundaries and associated porosity (Ref 7 ). 8YSZ-TBC and zirconate TBC has a typical single-mode porosity structure.…”

Section: Resultsmentioning

confidence: 99%

“…The tested TBC samples were examined on the coating surfaces at 1000, 1500 and 2000 cycles, respectively. The percentage of coating spallation area was calculated from image analysis results for each sample as detailed in previous work (Ref 7). As a rule of thumb, the spallation percentage more than 30% is considered as coating failure.…”

Section: Burner Rig Testmentioning

confidence: 99%

“…Therefore, it is necessary to develop optimal materials and offer the best possible solutions to meet the demands for advanced TBCs (Ref 4 - 6 ). In authors’ previous work, a composite phase ceramic was designed, optimized and tested for the topcoat in a TBC, and the test results of oxidation, thermal shock and thermal stability are very promising in comparison to a regular 8YSZ TBC and also a zirconate-based TBC (Ref 7 ). Additionally, the composite phase TBC demonstrated low thermal conductivity as theoretical predicted and experimental measured as 0.6-0.9 W/m·K in the range of 1000-1200 °C (Ref 7 , 8 ).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation and Characterization of a Durable Composite Phase Thermal Barrier Coating in Solid Particle Erosion and Burner Rig Tests

Rivellini

Ruggiero

et al. 2020

J Therm Spray Tech

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A new concept of composite phase ceramic had been proposed for the topcoat of a durable thermal barrier coating (TBC) system which is one of the critical technologies for advanced turbine engines. The composite phase TBCs showed promising performance related benefits over conventional single phase TBCs, including durability, material affordability, thermal stability and low thermal conductivity. The present work is to continue the effort to exploring the TBC behaviors of erosive wear by solid particle erosion test and thermal cyclic shock by special burner rig test. In the erosion test, the investigation was focused on the most important characteristics of erosion test results using different characterization methods, including the variations of erosion damages with impingement angle and finally the effect of high temperature sintering. In the burner rig test, the TBC was exposed to a rapidly thermal cycling condition introduced by a high heat flux and high-velocity combustion torch. The TBC damages and failure modes were identified and explained in terms of microstructural observation and mechanism discussion. The composite phase c ? t 0 TBC demonstrated improved erosion resistance relative to a Gd 2 Zr 2 O 7 TBC and equivalent thermal shock resistance to a conventional 8YSZ TBC. Keywords air plasma spray Á burner rig test Á coating characterization Á erosion test Á thermal barrier coating This article is an invited paper selected from abstracts submitted for the 2020 International Thermal Spray Conference, ITSC2020 that was to be held from June 10-12, 2020, in Vienna, Austria. The conference was cancelled due to the coronavirus (COVID-19) pandemic. The paper has been expanded from the planned presentation.

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Section: Introductionsupporting

confidence: 92%

Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Burner Rig Testmentioning

confidence: 99%