Oxidation of ultrahigh temperature ceramics: kinetics, mechanisms, and applications

Kane, Kenneth; Pint, Bruce A.; Mitchell, D. J.; Haynes, J. Allen

doi:10.1016/j.jeurceramsoc.2021.05.055

Cited by 71 publications

(44 citation statements)

References 123 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In most applications, the oxidation resistance at high temperatures is paramount to guarantee structural integrity in service, which has been comprehensively reviewed by several authors 3–5 . Monolithic ZrB 2 shows passive oxidation protection at temperatures below ≈1100°C due to the formation of a continuous B 2 O 3 layer 6–8 .…”

Section: Introductionmentioning

confidence: 99%

“…ZrB 2 has undergone extensive research for applications in extreme environments such as aero-propulsion, atmospheric reentry, or hypersonic flight due to its unique combination of properties, such as high melting temperature, low theoretical density, thermal shock resistance, and chemical resistance. [1][2][3] These properties also make ZrB 2 an attractive material for applications in the temperature range between 1200 and 1400 • C.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

et al. 2022

View full text Add to dashboard Cite

The focus of the present work is the investigation of the influence of polymer‐derived ceramics, used as sintering aids for preparing ZrB2‐based monoliths, on their high‐temperature oxidation behavior. For the preparation of the monoliths, ZrB2 powder was coated with polymer‐derived SiCN, SiZrCN, or SiZrBCN and subsequently densified via hot‐pressing at temperatures as low as 1800°C. To investigate the oxidation kinetics, thermogravimetric analysis (TGA) was performed at 1300°C in synthetic air with exposure times of 50 and 100 h. A detailed study of the materials oxide scale and subsurface microstructure was conducted using optical microscopy, electron probe microanalysis, scanning electron microscopy, and X‐ray diffraction. The experimental findings were compared to thermodynamic equilibrium calculations using the CALPHAD method, which led to a better understanding of the oxidation mechanism. In comparison to the literature data of ZrB2–SiC, the results show improved oxidation resistance for all three investigated materials. The formation of gaseous species during oxidation, in particular CO, CO2, B2O3, and SiO, within the oxide scale of the monoliths was rationalized via CALPHAD calculations and used to explain the oxidation behavior and kinetics and also the formation of bubbles in the subsurface region of the oxidized specimens.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Preceramic polycarbosilane polymers are commonly used as precursors to make ceramic fibers 10,39 and ceramic matrix. [7][8][9]40,41 The chemical and volume changes that accompany ceramization of the polymer during pyrolysis have been documented in several studies. For example, see Refs [39][40][41][42].…”

Section: Methodsmentioning

confidence: 99%

“…SiC‐based ceramic matrix composites (CMCs) are an attractive class of high temperature structural materials for the next generation of land‐based gas turbines 1–4 . In addition to their exceptional mechanical integrity, SiC oxidizes at very slow rates in high‐temperature ambient environments 5–7 . However, in water vapor containing environments, silica formation is accelerated 8–10 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluating steam oxidation kinetics of environmental barrier coatings

et al. 2021

Self Cite

View full text Add to dashboard Cite

Environmental barrier coatings (EBCs) are a commercially proven means of protecting SiC-based materials in gas turbine environments. However, there are little specific data in the literature on the impact of coatings like Yb 2 Si 2 O 7 on preventing accelerated SiO 2 growth in the presence of H 2 O. Quantification of reduced rates are necessary for evaluating and comparing EBC effectiveness and incorporation of silica growth rates into future EBC lifetime models. In this study, baseline kinetics of silica formation on bare Si and chemically vapor deposited (CVD) SiC in the 1250-1425℃ range were obtained via 100 h isothermal exposures in dry air and steam environments utilizing a SiC reaction tube to mitigate specimen volatility. An Arrhenius plot of the resulting rates was constructed, representing baseline minimum and maximum rates for Si and SiC oxidation at ambient pressure. Various EBC systems on CVD SiC substrates including air plasma sprayed (APS) EBCs with and without a Si bond coating and with surface roughening to enhance Yb 2 Si 2 O 7 adhesion were subjected to 1-h furnace cycle testing in air with 90vol%H 2 O at 1250-1350℃ for up to 500 cycles. After exposure, silica formation rates were measured and compared to the baseline rates to assess EBC effectiveness, where EBC effectiveness is gauged as the propensity to reduce underlying rates of silica formation. With a Si bond coating, a ~180 µm Yb 2 Si 2 O 7 (YbDS) top coating reduced rates over the entire 1250°-1350℃ range. Without a Si bond coating, ~60 µm (YbDS) coatings deposited directly onto CVD SiC exhibited poor adhesion, and had to be deposited onto substrates with enhanced roughness at 1350℃. While exhibiting good adhesion at 1350℃, overall the single layer YbDS coating exhibited a decreasing effectiveness from 1250° to 1350℃.

show abstract

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

et al. 2023

View full text Add to dashboard Cite

Tantalum carbide (TaC) and hafnium carbide (HfC) have some of the highest melting temperatures among the transition metal carbides, borides, and nitrides, making them promising materials for high‐speed flight and high‐temperature structural applications. Solid solutions of TaC and HfC are of particular interest due to their enhanced oxidation resistance compared to pure TaC or HfC. This study looks at the effect of Hf content on the oxidation resistance of TaC–HfC sintered specimens. Five compositions are fabricated into bulk samples using spark plasma sintering (2173 K, 50 MPa, 10 min hold). Oxidation behavior of a subset of the compositions (100 vol% TaC, 80 vol% TaC + 20 vol% HfC, and 50 vol% TaC + 50 vol% HfC) is analyzed using an oxyacetylene torch for 60 s. The TaC–HfC samples exhibit a reduction in the oxide scale thickness and the mass ablation rate with increasing HfC content. The improved oxidation resistance can be attributed to the formation of a Hf6Ta2O17 phase. This phase enhances oxidation resistance by reducing oxygen diffusion and serving as a protective layer for the unoxidized material. The superior oxidation resistance of TaC–HfC samples makes these materials strong contenders for the development of high‐speed flight coatings.

show abstract

Oxidation of ultrahigh temperature ceramics: kinetics, mechanisms, and applications

Cited by 71 publications

References 123 publications

Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

Evaluating steam oxidation kinetics of environmental barrier coatings

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

Contact Info

Product

Resources

About

Oxidation of ultrahigh temperature ceramics: kinetics, mechanisms, and applications

Cited by 71 publications

References 123 publications

Oxidation resistance of ZrB2‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

Oxidation resistance of ZrB2‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

Evaluating steam oxidation kinetics of environmental barrier coatings

Phase Transitions and Oxidation Behavior During Oxyacetylene Torch Testing of TaC–HfC Solid Solutions

Contact Info

Product

Resources

About

Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

Oxidation resistance of ZrB₂‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid