Static water vapor corrosion behavior of MoSi2/Mullite composite coating on Nb based alloy at 1500 °C

Fan, Kaifei; Sun, Jia; Guo, Lingxiang; Zhang, Yuyu; Fu, Qiangang

doi:10.1016/j.corsci.2022.110234

Cited by 11 publications

(1 citation statement)

References 51 publications

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“…Knittel et al [14] observed that when MoSi 2 was oxidized at 1000 • C-1400 • C, there was no continuous Mo 5 Si 3 layer at the interface between the oxide film and the silicide, which was inconsistent with predictions based on selective oxidation reactions. Maruyama et al [15] detected a Mo 5 Si 3 layer at the interface between the oxide film and MoSi 2 during high-temperature oxidation at 1500 • C, differing from the observation results at 1000 • C-1400 • C. The experimental study by Sharif [16] showed that the formation of Mo 5 Si 3 can only be observed when the oxidation temperature of MoSi 2 reached 1700 • C. Fan et al [17] observed a thicker Mo 5 Si 3 layer between the oxide layer and MoSi 2 after oxidation at 1500 • C.…”

Section: Introductionmentioning

confidence: 91%

Temperature dependence mechanism of high-temperature oxidation of transition metal silicide MoSi₂

Huang,

Zhang,

et al. 2024

J. Phys.: Condens. Matter

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Transition metal silicides represented by MoSi2 have excellent oxidation resistance and are widely used as high-temperature anti-oxidation coatings in hot end components of power equipment. However, the mechanism of temperature-dependent growth of MoSi2 oxidation products has not been revealed. Therefore, this study investigated the formation characteristics of oxide film and silicide-poor compound on MoSi2 at temperatures of 1000-1550℃ through high-temperature oxidation experiments, combined with microscopic Raman spectroscopy, SEM, and XRD characterizations. The result showed that MoSi2 underwent high-temperature selective oxidation reactions at 1000-1200℃, forming MoO2 and SiO2 oxide film on the substrate. As the oxidation temperature increased to 1550℃, after 100 hours of oxidation, along with the disappearance of MoO2 and the phase transformation of SiO2, a continuous Mo5Si3 layer with a thickness of approximately 47 μm was formed at the SiO2-MoSi2 interface. Thermodynamics and kinetic calculations further revealed the mechanism of temperature-dependent growth of oxidation products (MoO2 and Mo5Si3) during high-temperature oxidation process of MoSi2. As the temperature increased, the diffusion flux ratio of O and Si decreased, leading to a decrease in oxygen concentration at the interface and promoting the growth of the Mo5Si3 layer. Its thickness is an important indicator for evaluating the oxidation resistance of MoSi2 coatings during service. This study provides experimental and mechanistic insights into the temperature-dependent growth behavior of Mo5Si3 during the high-temperature oxidation of MoSi2 coating, and provides guidance for predicting the service life and improving the oxidation resistance of silicide coatings.

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Section: Introductionmentioning

confidence: 91%

Temperature dependence mechanism of high-temperature oxidation of transition metal silicide MoSi₂

Huang,

Zhang,

et al. 2024

J. Phys.: Condens. Matter

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High-temperature oxidation resistance behavior and mechanism of HfSiO4-modified C/SiC composites

Qiu,

Yang,

Huang

et al. 2024

Ceramics International

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In situ reaction–based synthesis of a novel nanostructured Lu2SiO5-based environmental barrier coating with controllable Lu2O3 content

Guo,

Jia,

Jin

et al. 2024

Ceramics International

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Static water vapor corrosion behavior of MoSi2/Mullite composite coating on Nb based alloy at 1500 °C

Cited by 11 publications

References 51 publications

Temperature dependence mechanism of high-temperature oxidation of transition metal silicide MoSi₂

Temperature dependence mechanism of high-temperature oxidation of transition metal silicide MoSi₂

High-temperature oxidation resistance behavior and mechanism of HfSiO4-modified C/SiC composites

In situ reaction–based synthesis of a novel nanostructured Lu2SiO5-based environmental barrier coating with controllable Lu2O3 content

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Static water vapor corrosion behavior of MoSi2/Mullite composite coating on Nb based alloy at 1500 °C

Cited by 11 publications

References 51 publications

Temperature dependence mechanism of high-temperature oxidation of transition metal silicide MoSi2

Temperature dependence mechanism of high-temperature oxidation of transition metal silicide MoSi2

High-temperature oxidation resistance behavior and mechanism of HfSiO4-modified C/SiC composites

In situ reaction–based synthesis of a novel nanostructured Lu2SiO5-based environmental barrier coating with controllable Lu2O3 content

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Temperature dependence mechanism of high-temperature oxidation of transition metal silicide MoSi₂

Temperature dependence mechanism of high-temperature oxidation of transition metal silicide MoSi₂