Oxidation behaviour and mechanical properties of sputter-deposited TMSi2 coatings (TM = Mo, Ta, Nb)

Bahr, A.; Richter, Silvia; Hahn, Rainer; Wójcik, Tomasz; Podsednik, M.; Limbeck, Andreas; Ramm, J.; Hunold, O.; Kolozsvári, S.; Riedl, H.

doi:10.1016/j.jallcom.2022.167532

Cited by 14 publications

(3 citation statements)

References 51 publications

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“…As one of the most important and mature high-temperature-protective coatings, silicide coatings are extensively applied in fields such as the aviation industry, space industry, military affairs, and the civilian industry [1][2][3]. Early in 1965, the Sylvania Company manufactured silicide coatings and successfully applied them to the Nb alloy nozzle of a Pratt & Whitney F100 rocket engine [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Kinetics Modeling of the Isothermal Oxidation Behavior of Silicide Coatings

An,

Zhang,

Liang

et al. 2023

Coatings

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In this paper, an online apparatus was developed for isothermal thermogravimetric measurement of silicide coatings within a wide temperature range (from −180 °C to 2300 °C) based on thermogravimetric analysis. Firstly, the measuring principle and method regarding silicide coatings of this apparatus were studied. Secondly, on the basis of oxidation kinetics analysis, the intrinsic mechanism and kinetic parameters of three stages (oxidation, diffusion, and fall-off) of silicide coatings were studied, and the oxidation kinetics features were also analyzed. In addition, according to mathematical physics methods, a kinetics model of silicide coatings in different stages of oxidation was established, including parameters such as weight change, oxidation rate, oxidation time, etc. Finally, online isothermal experiments from −180 °C to 2300 °C werecarried out and analyzed. The results showed that the kinetic model established in this paper was in good agreement with the oxidation process of silicide coatings. In this paper, a complete kinetics model including different oxidation stages is proposed for the entire oxidation process of a silicide coating, revealing its oxidation mechanism. The research will play a significant role in the study of preparation technology improvement and high-temperature environment application. This paper studied two measuring methods: weight gain and weight loss measuring methods. Also, an experiment was carried out on the silicide coatings to explore the physical oxidation process between −180 °C and 2300 °C. The results proved the perfect consistency of the kinetics model proposed by this paper and the oxidation process of silicide coatings. This paper will play a significant role in the study of preparation technology enhancement and high-temperature environment application. It also provides a theoretical foundation for accelerated aging and life evaluation methods.

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Section: Introductionmentioning

confidence: 99%

Analysis and Kinetics Modeling of the Isothermal Oxidation Behavior of Silicide Coatings

An,

Zhang,

Liang

et al. 2023

Coatings

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“…High working temperatures pose challenges, as they require materials that are resistant to oxidation and have good mechanical strength and high thermal and phase stability. Among silicide coatings, TaSi 2 has a higher hardness and fracture toughness compared to other coatings such as NbSi 2 and MoSi 2 [1], as well as high corrosion resistance [2]. TaSi 2 coatings have a high thermal stability and oxidation resistance up to 800 • C; however, above this temperature, the coating is intensively oxidized as a result of the formation of a loose Ta x SiO y complex oxide [3].…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Oxidation-Resistant Ta-Zr-Si-B-N and Ta-Zr-Si-B-C Coatings under In Situ TEM Heating and Vacuum Annealing

Sytchenko,

Loginov,

Levashov

et al. 2023

Applied Sciences

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Amorphous Ta-Zr-Si-B-C and Ta-Zr-Si-B-N coatings were deposited by magnetron sputtering using a ceramic target in Ar + C2H4 and Ar + N2 reaction media. Thermal stability under in situ TEM heating, vacuum annealing and nanoindentation, as well as the effect of heating on structural-phase transformations in coatings and their mechanical characteristics, have been studied. The results showed that the heating of amorphous Ta-Zr-Si-B-C and Ta-Zr-Si-B-N coatings in a TEM column leads to precipitation h-TaSi2 and c-TaC crystalline phases at a temperature of 600 °C and h-Ta5Si3 and c-TaN at a temperature of 1000 °C, respectively. Similar structural-phase transformations were revealed as a result of vacuum annealing. An increase in temperature from 20 to 1000 °C led to a decrease in the hardness of the carbon-containing coating from 21 to 16 GPa as a result of stress relaxation. For the Ta-Zr-Si-B-N coating at a temperature of 1000 °C, an increase in hardness was observed from 18 to 27 GPa, which is associated with the crystallization of the coating, with the formation of a nanocomposite structure with h-Ta5Si3 and c-TaN crystallites of 6–10 nm in size and an a-Si(Zr,B)N amorphous region.

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“…Some of the most promising coatings are those based on refractory metal silicides. Among the ion-plasma coatings, such as TaSi 2 , NbSi 2 , and MoSi 2 , MoSi 2 has the best characteristics and successfully retains its protective properties at 1200 • C for 100 h exposure [1]. In the laboratory of J.H.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Nitrogen Flow Rate on the Structure and Properties of Mo-Hf-Y-Si-B-N Coatings

Kiryukhantsev-Korneev,

Sytchenko,

Chudarin

et al. 2023

J. Compos. Sci.

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This work is devoted to the production of Mo-Hf-Y-Si-B-N coatings using magnetron sputtering with varying N2 flow rate; the analysis of magnetron discharge plasma; and the investigation of the structure, and optical, mechanical, and tribological characteristics, as well as crack resistance and oxidation resistance, of the coatings. The results show that Mo-Hf-Y-Si-B-N coatings were characterized by a dense, homogeneous structure. The non-reactive coatings had a maximum growth rate of 270 nm/min. An increase in the flow rate of N2 from 0 to 37.5 sccm led to a decrease in the growth rate by 5.4 times. Mo-Hf-Y-Si-B-N coatings were X-ray amorphous. In non-reactive coatings, the presence of Mo-Si and Mo-B bonds was revealed. The introduction of nitrogen contributed to the formation of an additional Si-N bond, an increase in the proportion of which led to an increase in transmittance. The Mo-Hf-Y-Si-B coating was characterized by a hardness value of 14 GPa. The maximum hardness of 16 GPa was observed in coatings obtained at nitrogen flow rates of 12.5 and 25.0 sccm. A further increase in the consumption of N2 to 37.5 sccm led to a decrease in hardness by 38%. The coating obtained at a flow rate of 25 sccm N2 was characterized by maximum elastic recovery of 57%, elastic strain to failure of 0.098, and resistance to plastic deformation of 0.157 GPa. An increase in nitrogen flow rate from 0 to 12.5 sccm contributed to a decrease in the wear rate of coatings under sliding friction conditions by 40%. The non-reactive Mo-Hf-Y-Si-B coating had the best oxidation resistance at 1000 °C.

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Oxidation behaviour and mechanical properties of sputter-deposited TMSi2 coatings (TM = Mo, Ta, Nb)

Cited by 14 publications

References 51 publications

Analysis and Kinetics Modeling of the Isothermal Oxidation Behavior of Silicide Coatings

Analysis and Kinetics Modeling of the Isothermal Oxidation Behavior of Silicide Coatings

Thermal Stability of Oxidation-Resistant Ta-Zr-Si-B-N and Ta-Zr-Si-B-C Coatings under In Situ TEM Heating and Vacuum Annealing

The Influence of Nitrogen Flow Rate on the Structure and Properties of Mo-Hf-Y-Si-B-N Coatings

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