Synthesis of Ti3SiC2 MAX phase powder by a molten salt shielded synthesis (MS3) method in air

Dash, Apurv; Sohn, Yoo Jung; Vaßen, Robert; Guillon, Olivier; González‐Julián, Jesús

doi:10.1016/j.jeurceramsoc.2019.05.011

Cited by 55 publications

(33 citation statements)

References 30 publications

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“…The synthesis process of Ti 3 SiC 2 was molten salt based with Ti/Si/Al/C in the ratio of 3/1/0.2/2 and is described in detail elsewhere. 12,13 Al was used to enhance the purity of Ti 3 SiC 2 phase during the molten salt shielded synthesis (MS 3 ). Since the sizing of SiC f was polyvinyl alcohol, the de-sizing was performed by continuous stirring of chopped fibers in hot water (80°C) for 1 hour followed by filtration.…”

Section: Methodsmentioning

confidence: 99%

Short SiC fiber/Ti₃SiC₂ MAX phase composites: Fabrication and creep evaluation

et al. 2020

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The compressive creep of silicon carbide fiber reinforced Ti 3 SiC 2 MAX phase with both fine and coarse microstructure was investigated in the temperature range of 1000-1300°C. Comparison of only steady-state creep was done to understand the response of fabricated composite materials toward creep deformation. It was demonstrated that the fibers are more effective in reducing the creep rates for the coarse microstructure by an increase in activation energy compared to the variant with a finer microstructure, being partly a result of the enhanced creep rates for the microstructure with larger grain size. Grain boundary sliding along with fiber fracture appears to be the main creep mechanism for most of the tested temperature range. However, there are indications for a changed creep mechanism for the fine microstructure for the lowest testing temperature. Local pores are formed to accommodate differences in strain related to creeping matrix and predominantly elastically deformed fibers during creep. Microstructural analysis was done on the material before and after creep to understand the deformation mechanics. K E Y W O R D S ceramic matrix composites, creep resistance, SiC fibers, Ti 3 SiC 2 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Methodsmentioning

confidence: 99%

Short SiC fiber/Ti₃SiC₂ MAX phase composites: Fabrication and creep evaluation

et al. 2020

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“…The addition of 0.1% Al to the reaction mixture results in the increase of MAX phase purity by formation of TiAl 3 as the intermediate, thus reducing TiO 2 probably formed due to oxidation at low temperatures. The formation of Al 2 O 3 in the interface of the MAX phase and KBr block the out‐diffusion of Si into the KBr slat, thus maintaining the stoichiometric ratios of the MAX phase …”

Section: Resultsmentioning

confidence: 99%

“…Recent publications refer to this protocol as molten salt shielded synthesis (MS 3 ) . Based on an initial report, MAX phase is prepared by mixing stoichiometric quantities of powders of Ti, Si, Al, and C (Figure 4f).…”

Section: Phasesmentioning

confidence: 99%

Synthesis Protocols of the Most Common Layered Carbide and Nitride MAX Phases

2020

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MAX phases represent a large group of carbide‐ and nitride‐layered ternary compounds. Their general formula is Mn+1AXn, where n = 1–3, M is an early transition metal, A is an A‐group element, and X is either carbon or nitrogen. The MAX phases combine properties of metals (good electrical and thermal conductivity, machinability, low hardness, thermal shock resistance, and damage tolerance) with those of ceramics (high elastic moduli, temperature strength, and oxidation and corrosion resistance). Publications on MAX phases have increased considerably in recent years. A late development causing heightened interest in MAX phases is the possibility by which these can be selectively etched to MXenes by removal of the A‐group element. In view of optimizing properties for prospective applications, the synthesis protocols of some of the most common carbide and nitride MAX phases are reviewed. Characterization of their physical, mechanical, and corrosion/oxidation properties is also discussed. Recent developments have revealed the potential for further practical application and have led to accessible strategies to synthesize new MAX phases using the pressure‐less sintering, spark plasma sintering, or molten salt routes.

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“…The higher content of TiC might have resulted from the thermal decomposition of Ti 3 SiC 2 during sintering, whereas the increase in the Al 2 O 3 content from 1 to 4.6 wt% after sintering can be related to the crystallization of amorphous aluminum hydroxide which could not be detected by XRD in the powder stage. The referred aluminum hydroxide might have formed due to the reaction of unreacted Al with water during the washing step after the molten salt‐based synthesis process 28,30 . The proposed mechanism of decomposition is by deintercalation of Si‐from Ti 3 SiC 2 and subsequent formation of TiC x 31,32 .…”

Section: Resultsmentioning

confidence: 99%