Oxidation Behaviors of Si/Al Pack Cementation Coated Mo–3Si–1B Alloys at Various Temperatures

Yang, Wonchul; Choi, Kwang-Soo; Baik, Kyeong Ho; Kim, Youngmoo; Lee, Seong; Kim, Jeongmin; Lee, Jongwon; Park, Joon Sik

doi:10.1007/s12540-019-00471-4

Cited by 4 publications

(1 citation statement)

References 46 publications

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“…As aforementioned, two layers of mainly silicide and aluminide were considered as a coating layer. It has been documented that when Si and Al were coated on Mo-based alloys, silicide (MoSi 2 ) and aluminide (Mo 3 Al 8 ) are coated [24], i.e., when the two Si and Al were coated through pack cementation, it is observed that the outer layer is identified as a silicide and the inner layer is identified as aluminide layer, possibly due to faster diffusion of Al than Si in the pack powder. In this study, while all of alloy component were distributed through the coating layer, it appears that the outer layer was considered as a silicide and the next layer was considered as an aluminide layer.…”

Section: High-temperature Flame Testsmentioning

confidence: 99%

Degradation Properties of Refractory MoNbTaVW High-Entropy Alloys with Simultaneous Si/Al Pack Cementation Coatings Under High-Temperature Flame Tests

Yang

Choi

et al. 2021

Oxid Met

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This paper aims to improve the oxidation resistance of MoNbTaVW (at%) refractory high-entropy alloys after flame tests at 1350 ℃ with Si/Al pack cementation coatings. After the Si/Al pack cementation coatings were applied, a coating layer of about 80 μm with a sequence of Si-rich layer (silicide)/interdiffusion layer/Al-rich layer (aluminide)/Al diffusion layer was formed. After the flame tests at 1350 °C for 20 min, the uncoated specimens formed composite oxides of Nb 2 O 5 (s), Ta 2 O 5 (s), and V 2 O 5 (s) with porosity of MoO 3 (g) and WO 3 (g) with a weight gain. On the other hand, the Si/Al coated specimens were composed of Si-rich layer (silicide)/ interdiffusion layer/Al-rich layer (aluminide)/Al diffusion layer. After the flame tests, SiO 2 and Al 2 O 3 ceramic protective layers were formed on the surface and prevented additional oxidation. The oxidation behaviors of MoNbTaVW alloys and the Si/Al pack cementation coated alloys were discussed with microstructures and phase development.

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Section: High-temperature Flame Testsmentioning

confidence: 99%

Degradation Properties of Refractory MoNbTaVW High-Entropy Alloys with Simultaneous Si/Al Pack Cementation Coatings Under High-Temperature Flame Tests

Yang

Choi

et al. 2021

Oxid Met

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Effect of Microstructure on Oxidation and Micro-mechanical Behavior of Arc Consolidated Mo-Ti-Si-(B) Alloys

Paul,

Kumar,

Kishor

et al. 2024

J. of Materi Eng and Perform

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The present study deals with the development and characterization of Mo-35Ti-10Si and Mo-35Ti-10Si-2B (wt.%) alloy for ultra-high temperature applications beyond the temperature limit of existing super alloys. The microstructural characterization using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), electron back scattered diffraction (EBSD), x-ray diffraction (XRD) revealed that the Mo-35Ti-10Si-2B alloy was consisted of three phases, namely, (Mo, Ti)ss, (Mo, Ti)5SiB2 and (Ti, Mo)5Si3; whereas, Mo-35Ti-10Si alloy was found to be consisting of (Mo, Ti)ss, and (Mo,Ti)3Si phases. Since quantification of boron is difficult by EDS, Particle Induced Gamma-ray Emission (PIGE), a nuclear reaction analysis technique was used for chemical composition analysis of boron. The oxidation behavior of the Mo-35Ti-10Si-2B alloy in the temperature regime of 825-1250 °C was studied in detail and compared with boron-free Mo-35Ti-10Si alloy. Mo-35Ti-10Si-2B alloy exhibited superior oxidation behavior at intermediate temperatures of 825 °C, and excellent oxidation resistance at higher temperatures between 1000 and 1250 °C due to the formation of the protective borosilica and double oxide layers (TiO2 and duplex borosilica-TiO2), respectively. High-temperature oxidation mechanisms were discussed using detailed microstructural cross section analysis of the oxidized alloy samples. The micro-mechanical behavior of constitutive phases of the Mo-35Ti-10Si-2B alloy were studied by microhardness, nano-indentation and micropillar compression testing. The micropillar compression of (Mo, Ti)ss phase showed fairly ductile behavior with the evidence of activation of dislocation in the form of slip lines revealed through the post-deformation fractography. Deformation studies of (Mo, Ti)5SiB2 and (Ti, Mo)5Si3 phases were also carried out which showed large strain bursts indicating possibility of activation of dislocation activities even at room temperatures imparting low level of ductility.

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Microstructures and high temperature oxidation behaviors of AlMo0.5NbTa0.5TiZr high entropy alloys coated by silicon pack cementation

Hwang

Shinde

et al. 2023

Corrosion Science

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Oxidation Behaviors of Si/Al Pack Cementation Coated Mo–3Si–1B Alloys at Various Temperatures

Cited by 4 publications

References 46 publications

Degradation Properties of Refractory MoNbTaVW High-Entropy Alloys with Simultaneous Si/Al Pack Cementation Coatings Under High-Temperature Flame Tests

Degradation Properties of Refractory MoNbTaVW High-Entropy Alloys with Simultaneous Si/Al Pack Cementation Coatings Under High-Temperature Flame Tests

Effect of Microstructure on Oxidation and Micro-mechanical Behavior of Arc Consolidated Mo-Ti-Si-(B) Alloys

Microstructures and high temperature oxidation behaviors of AlMo0.5NbTa0.5TiZr high entropy alloys coated by silicon pack cementation

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