A comparative study of calcium–magnesium–aluminum–silicon oxide mitigation in selected self-healing thermal barrier coating ceramics

Gu, Jingjing; Wei, Bowen; Berendt, Alexander F.; Ghoshal, Anindya; Walock, Michael J.; Reidy, Richard F.; Berman, Diana; Aouadi, Samir

doi:10.1557/jmr.2020.220

Cited by 5 publications

(1 citation statement)

References 30 publications

(52 reference statements)

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“…The CMAS sand was obtained from a commercial source (AFRL-02 test dust, PTI Inc., Arden Hills, MN, USA). Composition analysis of the CMAS sand revealed that it comprised 34% quartz, 30% gypsum, 17% aplite, 14% dolomite, and 5% salt; the DSC/DTA scans data showed that the melting temperature was 1150~1200 • C [29]. The sand was mixed with alcohol to form a slurry and was then brushed evenly over the surfaces of the TBC samples at a controlled dosage of 35 ± 2 mg/cm 2 .…”

Section: Cmas Corrosion Testmentioning

confidence: 99%

Novel Thermal Barrier Coatings with Phase Composite Structures for Extreme Environment Applications: Concept, Process, Evaluation and Performance

Rivellini

Ruggiero

et al. 2023

Coatings

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In this paper, a novel concept in the field of phase composite ceramics has been proposed and applied for creating the topcoats of durable thermal barrier coatings (TBCs), which is one of the most critical technologies for advanced high-efficiency gas turbine engines in extreme environments. The phase composite ceramic TBCs were designed to demonstrate superior and comprehensive performance-related merits, benefits, and advantages over conventional single-phase TBCs with a topcoat of 8YSZ or Gd2Zr2O7, including thermal phase stability, thermal shock durability, low thermal conductivity, and solid particle erosion resistance. In this paper, we review and summarize the development work conducted so far related to the phase composite ceramic concept, coatings processing, and experimental investigation into TBC behaviors at elevated temperatures (typically, ≥1250 °C) using different evaluation and characterization methods, including isothermal sintering, a burner rig test, a solid particle-impinging erosion test, and a CMAS corrosion test. Two-phase (t’+c) zirconia-based TBCs demonstrated improved thermal shock and erosion resistance in comparison to conventional single-phase (t’), 8YSZ TBC, and Gd2Zr2O7 TBC, when used separately. Additionally, a triple-phase (t’+c+YAG) TBC sample demonstrated superior CMAS resistance. The TBC’s damage modes and failure mechanisms for thermal phase stability, thermal cycling resistance, solid particle erosion behavior, and CMAS infiltration are also characterized and discussed in detail, in terms of microstructural characterization and performance evaluation.

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Section: Cmas Corrosion Testmentioning

confidence: 99%