Microstructural evolution and high-temperature oxidation mechanisms of a Ti-Mo-Si composite

Lü, Qianqian; Hao, Yanan; Wang, Yuan‐Yuan; Feng, Peizhong; Fan, Jing

doi:10.1016/j.corsci.2019.108180

Cited by 24 publications

(5 citation statements)

References 38 publications

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“…The weight gain was hastily enhanced with increasing oxidation time, which obeyed a classical parabolic law, as shown in Figure 4A. This behavior has been reported in previous studies and could be described in terms of the following equation 19 :

\begin{equation}{W^2} = kt\end{equation}

where k is the parabolic rate constant and t is the oxidation time.…”

Section: Resultssupporting

confidence: 77%

Section: Analysis Of the Oxidation Mechanism Of Si 3 N 4 /O′-sialon C...supporting

confidence: 81%

“…Conversely, active oxidation leads to mass loss. Their difference is mainly influenced by the partial pressure of oxygen and temperature 18,19 . As mentioned by Sheehan, 20 Si 3 N 4 underwent active oxidation at a higher partial pressures of oxygen and passive oxidation at lower partial pressures of oxygen.…”

Section: Resultsmentioning

confidence: 90%

“…Their difference is mainly influenced by the partial pressure of oxygen and temperature. 18,19 As mentioned by Sheehan, 20 Si 3 N 4 underwent active oxidation at a higher partial pressures of oxygen and passive oxidation at lower partial pressures of oxygen. Therefore, the active oxidation and passive oxidation largely affected the Si 3 N 4 oxidation kinetic profiles.…”

Section: Analysis Of the Oxidation Mechanism Of Si 3 N 4 /O′-sialon C...mentioning

confidence: 84%

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Improved oxidation resistance properties of Si ₃ N ₄ /O′–SiAlON composite ceramics by a repeated sintering method

Bao

2022

Int J Applied Ceramic Tech

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Si 3 N 4 /O′-SiAlON composite ceramics with superior oxidation resistance properties were fabricated by a repeated sintering method. The effects of sintering time on the phase evolution, microstructure, and oxidation resistance properties of the Si 3 N 4 /O′-SiAlON composite ceramics were investigated. The results indicated that the content of the O′-SiAlON phase and the densification of Si 3 N 4 /O′-SiAlON composite ceramics increased after two-time sintering. Furthermore, the thickness of the oxide layer of the Si 3 N 4 /O′-SiAlON composite ceramics after oxidation at 1100-1500 • C for 30 h was not significant. Compared to the oxidation weight gain after the one-time sintering process, the oxidation weight gain of Si 3 N 4 /O′-SiAlON composite ceramics was 0.432 mg/cm 2 after two-time sintering when oxidized at 1500 C for 30 h, which was reduced by 43.3%. The mechanism of the improved oxidation resistance properties was ascribed to the formation of more O′-SiAlON and the enhancement of the densification.

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\begin{equation}{W^2} = kt\end{equation}

where k is the parabolic rate constant and t is the oxidation time.…”

Section: Resultssupporting

confidence: 77%

Section: Analysis Of the Oxidation Mechanism Of Si 3 N 4 /O′-sialon C...supporting

confidence: 81%

Section: Resultsmentioning

confidence: 90%

Section: Analysis Of the Oxidation Mechanism Of Si 3 N 4 /O′-sialon C...mentioning

confidence: 84%

See 2 more Smart Citations

Improved oxidation resistance properties of Si ₃ N ₄ /O′–SiAlON composite ceramics by a repeated sintering method

Bao

2022

Int J Applied Ceramic Tech

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“…Then, they proved that the Ti content was one of the most significant influencing factors contributing to the intermediate-temperature oxidation resistance [47]. Moreover, Lu et al [67] pointed out that the D8 8 -containing alloys could achieve good oxidation resistance at up to 900 • C benefiting from the self-healing ability where the amorphous SiO 2 seals the clearances between the TiO 2 grains.…”

Section: Oxidation Behaviormentioning

confidence: 99%

From Mo–Si–B to Mo–Ti–Si–B Alloys: A Short Review

Zhao

Zhu

et al. 2022

Materials

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Mo–Si–B alloys have attracted considerable research interest during the last several decades due to their high melting points, excellent high-temperature strength and relatively good oxidation resistance. However, insufficient room-temperature fracture toughness and high-temperature oxidation resistance restrain their further application. Generally, a sufficient volume fraction of BCC-Mo solid-solution phase, providing the ductility, and a high Si content, responsible for the formation of passive oxide scales, is difficult to achieve simultaneously in this ternary system. Recently, macroalloying of Ti has been proposed to establish a novel phase equilibrium with a combination of enough BCC phase and intermetallic compounds that contain a large amount of Si. In this article, the development history from the ternary Mo–Si–B to the quaternary Mo–Ti–Si–B system was reviewed. It was found that the constitution phases could be easily tailored by changing the Ti content. In this regard, better performance of mechanical properties and oxidation resistance can be obtained through proper alloy design. In-depth understanding of the advantages of the quaternary alloys over their ternary ancestors may contribute to bringing about a new concept in designing novel ultra-high-temperature structural materials.

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Unveiling the Intricacies of a Ductile‐Phase Toughened Intermetallic: An In‐Depth Exploration of a Eutectic Mo–Si–Ti Alloy and its Mechanical Behavior

Vikram,

Aramanda,

Schliephake

et al. 2024

Adv Eng Mater

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In this work, we present the development of directional solidification for a novel high‐temperature Mo‐20Si‐52.8Ti (at. %) ternary alloy using a modified Bridgeman type apparatus. The resulting alloy exhibits a microstructure consisting of a body‐centered cubic solid solution BCCss and a hexagonal silicide (Ti,Mo)5Si3 with approximate volume fractions of 50% for each phase. The phases exhibit a crystallographic orientation relationship with and . Different solidification velocities were imposed which revealed an inverse relationship to the lamellar spacing according to a Jackson‐Hunt type scaling. Mechanical characterization using Vickers indentation demonstrated that the BCCss accommodates plasticity through dislocation mediation, while the silicide phase exhibits high hardness and brittleness, serving as a crack initiation site. Crack propagation was arrested and deflected at the interface to the BCCss. Fracture toughness measurements via indentation yield a fracture toughness of 3.7 MPa√m for the silicide, somewhat higher than previously reported values for Si‐ and Cr‐based intermetallics. The directionally solidified (DS) specimens showed an enhanced fracture toughness attributed to a greater BCCss length scale; thus, combining the ductile and hard phases resulted in a ductile‐phase toughened intermetallic composite. The findings open up new possibilities for the design of advanced intermetallic composites with improved toughness performance.This article is protected by copyright. All rights reserved.

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Microstructural evolution and high-temperature oxidation mechanisms of a Ti-Mo-Si composite

Cited by 24 publications

References 38 publications

Improved oxidation resistance properties of Si ₃ N ₄ /O′–SiAlON composite ceramics by a repeated sintering method

Improved oxidation resistance properties of Si ₃ N ₄ /O′–SiAlON composite ceramics by a repeated sintering method

From Mo–Si–B to Mo–Ti–Si–B Alloys: A Short Review

Unveiling the Intricacies of a Ductile‐Phase Toughened Intermetallic: An In‐Depth Exploration of a Eutectic Mo–Si–Ti Alloy and its Mechanical Behavior

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Microstructural evolution and high-temperature oxidation mechanisms of a Ti-Mo-Si composite

Cited by 24 publications

References 38 publications

Improved oxidation resistance properties of Si 3 N 4 /O′–SiAlON composite ceramics by a repeated sintering method

Improved oxidation resistance properties of Si 3 N 4 /O′–SiAlON composite ceramics by a repeated sintering method

From Mo–Si–B to Mo–Ti–Si–B Alloys: A Short Review

Unveiling the Intricacies of a Ductile‐Phase Toughened Intermetallic: An In‐Depth Exploration of a Eutectic Mo–Si–Ti Alloy and its Mechanical Behavior

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Product

Resources

About

Improved oxidation resistance properties of Si ₃ N ₄ /O′–SiAlON composite ceramics by a repeated sintering method

Improved oxidation resistance properties of Si ₃ N ₄ /O′–SiAlON composite ceramics by a repeated sintering method