Formation kinetics of multi-layered interfacial zone between γ-TiAl and glass–ceramic coatings via interfacial reactions at 1000°C

Shen, Mingli; Zhu, Shenglong; Wang, Fuhui

doi:10.1016/j.corsci.2014.11.036

Cited by 32 publications

(16 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Plenty of experiments have shown its outstanding performance on protecting

γ - TiAl

against high‐temperature oxidation . For example, isothermal mass gain of

γ - TiAl

with the coating at 1000°C in air was only 0.76 mg cm −2 according to the study . Furthermore, in terms of this coating, particularly, blending 30 wt% alumina particles is to minimize the mismatch of thermal expansion coefficients (TECs) between coating and substrate alloy so that spalling of coating during thermal shock can be remarkably avoided …”

Section: Introductionmentioning

confidence: 94%

“…The thickness of the coating is about 10 μm. At elevated temperature, about 1300 K, due to the high reactive nature of Al and Ti, a series of chemical reactions are thermodynamically feasible between the γ‐TiAl and glass‐ceramic coating . According to the standard Gibbs free energy change of each reaction and contents of reactants in the system, three main reactions are picked out of all reactions as following

\begin{matrix} normalAl + \frac{3}{4} Si {normalO}_{2} = \frac{1}{2} A {normall}_{2} {normalO}_{3} + \frac{3}{4} Si \\ normalTi + normalSi {normalO}_{2} = Ti {normalO}_{2} + normalSi \\ normalTi + \frac{3}{5} normalSi = \frac{1}{5} T {normali}_{5} S {normali}_{3} \end{matrix}

…”

Section: Problem Statementmentioning

confidence: 99%

“…After a period of reaction, an interfacial zone composed of the products emerges with a sandwich layers. The cross‐sectional SEM back‐scattered electron image of this interfacial zone is shown in Figure , which comes from the study …”

Section: Problem Statementmentioning

confidence: 99%

“…

ε_{italicij}^{e}

can be further defined as the total strain ε ij subtracting the inelastic strain such as the irreversible strain, mismatch strain due to chemical reactions and diffusion and thermal strain etc. In this study, no plastic deformation assumption is adopted, as no plastic flow has been reported by the group who invented this coating . Furthermore, we also assume the temperature of the system is kept at 1300K without variation, that is, it is an isothermal model.…”

Section: Coupled Chemomechanical Model For γ‐Tial and Glass‐ceramic Cmentioning

confidence: 99%

“…The initial concentrations for each species are calculated by their density and molar mass as follows:

\begin{matrix} c_{normalAl} (r, 0) = 35000 [1 - H (r - R)] \\ c_{Si {normalO}_{2}} (r, 0) = 35000 H (r - R) \\ c_{normalTi} (r, 0) = 59500 [1 - H (r - R)] \\ c_{normalSi} (r, 0) = 0 \\ c_{A {normall}_{2} {normalO}_{3}} (r, 0) = 0 \\ c_{Ti {normalO}_{2}} (r, 0) = 0 \\ c_{T {normali}_{5} S {normali}_{3}} (r, 0) = 0 \end{matrix}

where H(r‐R) is the unit step function. It should be noted that all initial concentrations in Equation are in the unit of mol m −3 .…”

Section: Coupled Chemomechanical Model For γ‐Tial and Glass‐ceramic Cmentioning

confidence: 99%

See 4 more Smart Citations

Chemomechanical analysis for interfacial reactions between γ‐TiAl alloy and glass‐ceramic coating in micro/nano scale

Liu

Shen

2018

J Am Ceram Soc

View full text Add to dashboard Cite

To simulate interfacial reactions process and deformation in γ‐TiAl and glass‐ceramic coating system at high temperature, we developed a coupled chemomechanical model with chemical reactions, diffusion, and mechanical deformation incorporated. Tensile radial and circumferential stresses develop in interfacial zone and coatings as the interfacial reactions occur. Tensile radial stress could tear coatings off alloys while the tensile circumferential stress could result in crack initiation and propagation, even spalling of coatings. The bulk radial stress can be markedly reduced by taking the surface effect into account. Consequently, tensile radial stress vanishes in alloy‐coating system on nano scale.

show abstract

“…Plenty of experiments have shown its outstanding performance on protecting

γ - TiAl

against high‐temperature oxidation . For example, isothermal mass gain of

γ - TiAl

Section: Introductionmentioning

confidence: 94%

\begin{matrix} normalAl + \frac{3}{4} Si {normalO}_{2} = \frac{1}{2} A {normall}_{2} {normalO}_{3} + \frac{3}{4} Si \\ normalTi + normalSi {normalO}_{2} = Ti {normalO}_{2} + normalSi \\ normalTi + \frac{3}{5} normalSi = \frac{1}{5} T {normali}_{5} S {normali}_{3} \end{matrix}

…”

Section: Problem Statementmentioning

confidence: 99%

Section: Problem Statementmentioning

confidence: 99%

“…

ε_{italicij}^{e}

Section: Coupled Chemomechanical Model For γ‐Tial and Glass‐ceramic Cmentioning

confidence: 99%

“…The initial concentrations for each species are calculated by their density and molar mass as follows:

\begin{matrix} c_{normalAl} (r, 0) = 35000 [1 - H (r - R)] \\ c_{Si {normalO}_{2}} (r, 0) = 35000 H (r - R) \\ c_{normalTi} (r, 0) = 59500 [1 - H (r - R)] \\ c_{normalSi} (r, 0) = 0 \\ c_{A {normall}_{2} {normalO}_{3}} (r, 0) = 0 \\ c_{Ti {normalO}_{2}} (r, 0) = 0 \\ c_{T {normali}_{5} S {normali}_{3}} (r, 0) = 0 \end{matrix}

where H(r‐R) is the unit step function. It should be noted that all initial concentrations in Equation are in the unit of mol m −3 .…”

Section: Coupled Chemomechanical Model For γ‐Tial and Glass‐ceramic Cmentioning

confidence: 99%

See 3 more Smart Citations

Chemomechanical analysis for interfacial reactions between γ‐TiAl alloy and glass‐ceramic coating in micro/nano scale

Liu

Shen

2018

J Am Ceram Soc

View full text Add to dashboard Cite

show abstract

Sol–gel-based coatings for oxidation protection of TiAl alloys

et al. 2020

J Mater Sci

View full text Add to dashboard Cite

Halogen effect for improving high temperature oxidation resistance of Ti-50Al by anodization

Lin

2017

Applied Surface Science

View full text Add to dashboard Cite

Formation kinetics of multi-layered interfacial zone between γ-TiAl and glass–ceramic coatings via interfacial reactions at 1000°C

Cited by 32 publications

References 51 publications

Chemomechanical analysis for interfacial reactions between γ‐TiAl alloy and glass‐ceramic coating in micro/nano scale

Chemomechanical analysis for interfacial reactions between γ‐TiAl alloy and glass‐ceramic coating in micro/nano scale

Sol–gel-based coatings for oxidation protection of TiAl alloys

Halogen effect for improving high temperature oxidation resistance of Ti-50Al by anodization

Contact Info

Product

Resources

About