High temperature oxidation behavior of MoSi2–Al2O3 composite coating on TZM alloy

Liu, Zhanggen; Li, Wei; Fan, Jing; Lv, Yaozha; Wang, Zhenwei; Zhao, Xiaojun

doi:10.1016/j.ceramint.2021.12.310

Cited by 18 publications

(14 citation statements)

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“…Some flaky particles were inlaying in the clusters, and were supposed to be Al 2 O 3 according to element mapping in Figure 6 h,i, which was originated from the pack mixture during pack cementation. Al 2 O 3 has been proved to be beneficial to the high-temperature oxidation resistance of the MoSi 2 coating in our previous work [ 18 , 19 ]. Nevertheless, Al 2 O 3 was not detected by XRD in Figure 5 due to low content.…”

Section: Resultsmentioning

confidence: 99%

“…To improve the thermal stability of the SiO 2 oxide scale on the MoSi 2 coating, one of the research hotspots is to develop MoSi 2 -based composite coatings doped with alloying elements (e.g., B [ 10 , 11 ], Al [ 12 , 13 ], Ti [ 14 ], Zr [ 15 ], and Hf [ 13 ]) or/and oxides (e.g., Al 2 O 3 [ 16 , 17 , 18 , 19 , 20 ], ZrO 2 [ 18 , 21 ], HfO 2 [ 18 , 22 ]), carbides (e.g., ZrC [ 23 ]), and borides (e.g., ZrB 2 [ 24 , 25 ]), which have been confirmed to be effective in improving the performance and longevity of the MoSi 2 coating at elevated temperatures. The B-doped MoSi 2 coating has been proven to perform excellent oxidation resistance benefiting from the formation of a protective borosilicate scale on the coating [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Oxidation Resistance of a Novel MoSi2-ZrB2-Based Coating on Mo-Based Alloy

et al. 2023

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To enhance the oxidation resistance of Mo-based TZM alloy (Mo-0.5Ti-0.1Zr-0.02C, wt%), a novel MoSi2-ZrB2 composite coating was applied on the TZM substrate by a two-step process comprising the in situ reaction of Mo, Zr, and B4C to form a ZrB2-MoB pre-layer followed by pack siliconizing. The as-packed coating was composed of a multi-layer structure, consisting of a MoB diffusion layer, an MoSi2-ZrB2 inner layer, and an outer layer of mixture of MoSi2 and Al2O3. The composite coating could provide excellent oxidation-resistant protection for the TZM alloy at 1600 °C. The oxidation kinetic curve of the composite coating followed the parabolic rule, and the weight gain of the coated sample after 20 h of oxidation at 1600 °C was only 5.24 mg/cm2. During oxidation, a dense and continuous SiO2-baed oxide scale embedded with ZrO2 and ZrSiO4 particles showing high thermal stability and low oxygen permeability could be formed on the surface of the coating by oxidation of MoSi2 and ZrB2, which could hinder the inward diffusion of oxygen at high temperatures. Concurrently, the MoB inner diffusion layer played an important role in hindering the diffusion of Si inward with regard to the TZM alloy and could retard the degradation of MoSi2, which could also improve the long life of the coating.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication and Oxidation Resistance of a Novel MoSi2-ZrB2-Based Coating on Mo-Based Alloy

et al. 2023

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“…Due to the superior high temperature oxidation resistance, great thermal stability, and high melting point, transition metal disilicides (TMSi2) are the prospective high-temperature structural materials in aerospace and nuclear fields [1,2]. While these silicides show promise, their broader application faces challenges due to diminished ductility and inadequate fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

The mechanical properties of (NbMoTaW)Si₂ from a first-principles calculations

Jiang,

Shao,

et al. 2024

J. Phys.: Conf. Ser.

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The realm of ceramic materials has seen a surge in interest directed towards high entropy disilicides due to their exceptional properties. Using the methodologies of density functional theory (DFT) and the special quasi-random structure (SQS), we have delved into the examination of structural stability and the inherent elastic properties of (NbMoTaW)Si2. The available experimental data and the optimized lattice parameters coincide very well. The thermodynamic stability observed in all high entropy ceramics, specifically (NbMoTaW)Si2 disilicides, can be attributed to their negative formation enthalpies. The present results of elastic parameters show that the strength/hardness of (NbMoTaW)Si2 are larger due to the higher bulk and shear moduli. The Vickers hardness of (NbMoTaW)Si2 is higher than the average value of component binary metal silicide, indicating solid solution strengthening effect. The mechanical anisotropy of the (NbMoTaW)Si2 reveals the significant difference in various directions on different crystalline planes. Conducting theoretical research holds significance in facilitating the synthesis of enhanced high entropy disilicides ceramics. Furthermore, such studies are crucial in advancing the evolution and practical utilization of high entropy materials.

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“…To solve the problem of poor oxidation resistance of tantalum and its alloys in high-temperature environments, high-temperature oxidation-resistant coatings are often applied to extend the service life of the material [11][12][13]. Current antioxidant coatings for tantalum and its alloys include oxide coatings, noble metal coatings, aluminide coatings, and silicide coatings [14][15][16][17][18]. Among them, researchers at home and abroad have extensively studied silicide coatings due to their broad scope of use and easy modification and optimization properties [11,[19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Experimental Optimization of Preparation and Microstructural Properties of a Diffusion Barrier for Tantalum-Based Silicide Coatings

Xiao

Zhou

et al. 2023

Materials

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To solve the problem of silicide coatings on tantalum substrates failing due to elemental diffusion under high-temperature oxidation environments and to find diffusion barrier materials with excellent effects of impeding Si elemental spreading, TaB2 and TaC coatings were prepared on tantalum substrates by the encapsulation and infiltration methods, respectively. Through orthogonal experimental analysis of the raw material powder ratio and pack cementation temperature, the best experimental parameters for the preparation of TaB2 coatings were selected: powder ratio (NaF:B:Al2O3 = 2.5:1:96.5 (wt.%)) and pack cementation temperature (1050 °C). After diffusion treatment at 1200 °C for 2 h, the thickness change rate of the Si diffusion layer prepared using this process was 30.48%, which is lower than that of non-diffusion coating (36.39%). In addition, the physical and tissue morphological changes of TaC and TaB2 coatings after siliconizing treatment and thermal diffusion treatment were compared. The results prove that TaB2 is a more suitable candidate material for the diffusion barrier layer of silicide coatings on tantalum substrates.

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High temperature oxidation behavior of MoSi2–Al2O3 composite coating on TZM alloy

Cited by 18 publications

References 41 publications

Fabrication and Oxidation Resistance of a Novel MoSi2-ZrB2-Based Coating on Mo-Based Alloy

Fabrication and Oxidation Resistance of a Novel MoSi2-ZrB2-Based Coating on Mo-Based Alloy

The mechanical properties of (NbMoTaW)Si₂ from a first-principles calculations

Orthogonal Experimental Optimization of Preparation and Microstructural Properties of a Diffusion Barrier for Tantalum-Based Silicide Coatings

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High temperature oxidation behavior of MoSi2–Al2O3 composite coating on TZM alloy

Cited by 18 publications

References 41 publications

Fabrication and Oxidation Resistance of a Novel MoSi2-ZrB2-Based Coating on Mo-Based Alloy

Fabrication and Oxidation Resistance of a Novel MoSi2-ZrB2-Based Coating on Mo-Based Alloy

The mechanical properties of (NbMoTaW)Si2 from a first-principles calculations

Orthogonal Experimental Optimization of Preparation and Microstructural Properties of a Diffusion Barrier for Tantalum-Based Silicide Coatings

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The mechanical properties of (NbMoTaW)Si₂ from a first-principles calculations