Microstructure and Oxidation Behavior of Anti-Oxidation Coatings on Mo-Based Alloys through HAPC Process: A Review

Fu, Tao; Cui, Kunkun; Wang, Jie; Zhang, Xu; Shen, Fuqiang; Yu, Laihao; Mao, Haobo

doi:10.3390/coatings11080883

Cited by 22 publications

(5 citation statements)

References 54 publications

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“…The selective oxidation of MoSi 2 at high temperatures has been extensively studied [12,13]. However, the product growth during the MoSi 2 oxidation process exhibits significant differences at different high temperatures.…”

Section: Introductionmentioning

confidence: 99%

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: 99%

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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“…In past work, we discussed the composition, structure and oxidation characteristics of HAPC coating on the surface of molybdenum and its alloys in detail [26]. However, there are almost no reviews reporting on research about other methods in this field [27].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Protection of High-Temperature Coatings on the Surface of Mo-Based Alloys—A Review

Shen

Zhang

et al. 2022

Coatings

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Molybdenum and its alloys, with high melting points, excellent corrosion resistance and high temperature creep resistance, are a vital high-temperature structural material. However, the poor oxidation resistance at high temperatures is a major barrier to their application. This work provides a summary of surface modification techniques for Mo and its alloys under high-temperature aerobic conditions of nearly half a century, including slurry sintering technology, plasma spraying technology, chemical vapor deposition technology, and liquid phase deposition technology. The microstructure and oxidation behavior of various coatings were analyzed. The advantages and disadvantages of various processes were compared, and the key measures to improve oxidation resistance of coatings were also outlined. The future research direction in this field is set out.

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“…While TZM exhibits a remarkable corrosion resistance to corrosion by molten metals and electrochemical processes, it oxidizes at temperatures above 400 °C evolving volatile molybdenum oxides [ 9 , 10 , 11 , 12 , 13 ]. In recent years, many studies were conducted to improve upon the oxidation resistance of TZM primarily by adding coatings to the exposed surfaces [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Properties of Titanium Zirconium Molybdenum Alloy after Exposure to Indium at Elevated Temperatures

et al. 2022

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Titanium zirconium molybdenum (TZM) is a high strength at high temperature alloy with favorable properties for use in high temperature structural applications. Use of TZM in high pressure, gas-containing autoclave systems was recently demonstrated for the ammonothermal method. Use of indium (In) in the system is desired, though there is a general lack of literature and understanding on the corrosion and impact of In on the mechanical properties of TZM. This study reports for the first time the mechanical properties of TZM after exposure to metallic In at temperatures up to 1000 °C. Static corrosion testing of TZM in In were performed at 750 °C and 1000 °C for 14 days. A microstructure analysis was performed suggesting no visible alteration of the grain structure. Differential thermal analysis (DTA) was performed to investigate compound formation between In and the primary constituents of TZM yielding no measurable reactions and hence no noticeable compound formation. X-ray energy dispersive spectroscopy (EDS) line scans across the TZM-In interface revealed no measurable mass transport of In into the TZM matrix. These results were confirmed using X-ray diffraction (XRD). Given the apparent inertness of TZM to In, mechanical properties of TZM after exposure to In were measured at test temperatures ranging from 22 °C to 800 °C and compared to unexposed, reference TZM samples from the same material stock. Tensile properties, including ultimate tensile strength, yield strength and total elongation, were found to be comparable between In-exposed and unexposed TZM samples. Impact fracture toughness testing (Charpy) performed at temperatures ranging from −196 °C to 800 °C showed that TZM is unaffected upon exposure to In. Tensile testing indicated ductile behavior at room temperature (slow strain rate) whereas impact testing (high strain rate) suggested a ductile to brittle transition temperature between 100 °C and 400 °C. Given these results, TZM appears to be a promising candidate for use as a force bearing material when exposed to In at high temperature.

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Microstructure and Oxidation Behavior of Anti-Oxidation Coatings on Mo-Based Alloys through HAPC Process: A Review

Cited by 22 publications

References 54 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

Oxidation Protection of High-Temperature Coatings on the Surface of Mo-Based Alloys—A Review

Properties of Titanium Zirconium Molybdenum Alloy after Exposure to Indium at Elevated Temperatures

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Microstructure and Oxidation Behavior of Anti-Oxidation Coatings on Mo-Based Alloys through HAPC Process: A Review

Cited by 22 publications

References 54 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

Oxidation Protection of High-Temperature Coatings on the Surface of Mo-Based Alloys—A Review

Properties of Titanium Zirconium Molybdenum Alloy after Exposure to Indium at Elevated Temperatures

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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