Effects of Al and Al4C3 contents on combustion synthesis of Cr2AlC from Cr2O3–Al–Al4C3 powder compacts

Yeh, C.L.; Kuo, C.W.

doi:10.1016/j.jallcom.2010.09.169

Cited by 18 publications

(7 citation statements)

References 37 publications

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“…Due to the addition of graphene with good conductivity, graphene promotes the crystal form of alumina coating to transform, and occurs a phase transition during PEO reaction process. When the temperature reaches to the phase transition temperature, γ‐Al 2 O 3 starts to change to α‐Al 2 O 3 phase 40 …”

Section: Resultsmentioning

confidence: 99%

“…Cross-sectional transmission electron microscope (TEM) images of G0 (A and B) and G2 (C-G): (A) bright field micrograph of G0, (B) magnified image of the local microstructure of G0 (the insert in the top right-hand is the diffraction pattern), (C) bright field micrograph of G2, (D-F) TEM diffraction pattern of the area A, B, C in (C), respectively, (G) mapping images of the white dotted line rectangle area temperature reaches to the phase transition temperature, γ-Al 2 O 3 starts to change to α-Al 2 O 3 phase 40. …”

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confidence: 99%

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Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Liu

Xie

et al. 2022

Int J Applied Ceramic Tech

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Incorporated graphene coating was successfully prepared on D16T aluminum alloy by plasma electrolytic oxidation (PEO) technology, and the effect of graphene on the microstructure, corrosion resistance, and wettability of the coating was investigated. Microstructure, composition, and morphology were studied by transmission electron microscope, confirming that graphene was successfully incorporated into the coating with pancake-like and embedded mode. The thickness and microhardness of the coating with graphene (G2) increased, whereas roughness and porosity reduced due to the incorporation of graphene, compared to the coating without graphene (G0). The resistive arc radius of G2 is obviously increased. The real impedance value of G2 is four times than that of G0. The resistance (R 1 ) of G0 and G2 are 3708 and 7533 Ω cm 2 , respectively. The resistance (R 2 ) of G0 and G2 are 2.508E5 and 7.752E5 Ω cm 2 , respectively. The contact angle of G2 under three liquid droplets was maximum, showing minimal surface-free energy (36.8 mJ/m 2 ). Formation water showed the most obvious effect on the wettability of the coating compared to the distilled water and sodium chloride solution. Results verified that graphene in PEO coating significantly improved the microstructure of the coating and enhanced the hydrophobic performance and corrosion resistance of the coating.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Liu

Xie

et al. 2022

Int J Applied Ceramic Tech

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“…Except conventional hot pressing, 4 newly developed self-propagating high temperature synthesis, 6 pulse discharge sintering (also known as spark plasma sintering) 7 and mechanical alloying 8 have also been used to synthesise bulk Cr 2 AlC. However, Tian et al found that as the phase formation sequence of the Cr 2 AlC was completed by liquid–solid reaction, the bulk density of the ceramics decreased because of the formation of pores caused by volatilisation of liquid phase during sintering.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of fine and high purity Cr₂AlC powders by novel method

Guan

2016

Advances in Applied Ceramics

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Cr 2 AlC powders using Cr/Al/C and Cr/Al/Cr 3 C 2 systems as raw materials were successfully synthesised by a microwave hybrid heating method for the first time. The mixtures of Cr, Al and graphite or Cr 3 C 2 with different molar ratios were used to investigate the formation of Cr 2 AlC phase. For Cr/Al/C with the molar ratios of 2:(1.0-1.2):1 system, Cr 2 AlC with a small amount of Cr 7 C 3 and Cr 2 Al was synthesised at 10008C for 3 min, and the average particle size was ,1 mm. For Cr/Al/Cr 3 C 2 with the molar ratio of 1:2:1 system, high purity Cr 2 AlC powders was synthesised at 10008C for 3 min, and the average particle size was ,1 mm. The synthesis of high purity Cr 2 AlC powders for short time was attributed to the combination of the hybrid heating effect and the introduction of Cr 3 C 2 as carbon source. Microwave hybrid heating is a promising method for the preparation of various other MAX phases.

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“…To improve the purity of MAX, Al 4 C 3 has been used to replace Al in starting mixtures because, at sintering temperatures, Al 4 C 3 can provide both Al and C atoms in the system of M–Al–C, and also Al 4 C 3 cannot be easily lost due to its higher melting point (2200°C) than Al. The Al containing MAX phases and their solid solutions such as (Ti 1−x Nb x ) 2 AlC, 13 Ti 3 Si 1−x Al x C 2 , 14 Cr 2 AlC, 15,16 Ti 2 AlC, 17,18 Ti 3 AlC 2 , 19 ZrAl 4 C 4 , 20 Zr 2 Al 4 C 5 and Zr 3 Al 4 C 6 , 21 Nb 2 AlC and (Ti,Nb) 2 AlC 22 have been consequently synthesised.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous pulverisation of Al₄C₃containing MAX bulk ceramics at room temperature

Chen

Zhou

2014

Advances in Applied Ceramics

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The deleterious effect of Al 4 C 3 on the performance of MAX ceramics has not attracted much attention. In the present study, Al 4 C 3 containing Cr 2 Al(Si)C and SiC/Cr 2 AlC ceramics have been prepared. It was found that spontaneous pulverisation of the as synthesised samples took place at room temperature after exposure in air and water for various durations. Volume expansion induced by the interaction of Al 4 C 3 with moisture is held responsible for the disintegration of Al 4 C 3 containing MAX ceramics. Preventive measures to avoid the formation of Al 4 C 3 upon preparing MAX ceramics were herein proposed.

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Effects of Al and Al4C3 contents on combustion synthesis of Cr2AlC from Cr2O3–Al–Al4C3 powder compacts

Cited by 18 publications

References 37 publications

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Synthesis of fine and high purity Cr₂AlC powders by novel method

Spontaneous pulverisation of Al₄C₃containing MAX bulk ceramics at room temperature

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Effects of Al and Al4C3 contents on combustion synthesis of Cr2AlC from Cr2O3–Al–Al4C3 powder compacts

Cited by 18 publications

References 37 publications

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Effect of graphene on the microstructure and corrosion resistance of PEO coating formed on D16T aluminum alloy

Synthesis of fine and high purity Cr2AlC powders by novel method

Spontaneous pulverisation of Al4C3containing MAX bulk ceramics at room temperature

Contact Info

Product

Resources

About

Synthesis of fine and high purity Cr₂AlC powders by novel method

Spontaneous pulverisation of Al₄C₃containing MAX bulk ceramics at room temperature