Thermodynamic Assessments and mechanically activated synthesis of ultrafine Cr 2 AlC MAX phase powders

Yembadi, Rajkumar; Panigrahi, Bharat B.

doi:10.1016/j.apt.2016.11.020

Cited by 25 publications

(3 citation statements)

References 30 publications

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“…The Cr (>99% pure, ~325 mesh, Alfa Aesar, Ward Hill, MA), Carbon (>99% pure, ~325 mesh, Loba Chemicals), and Aluminum powders (99.5%pure, ~325 mesh ‐ Alfa Aesar) were used as the precursor for the synthesis of Cr 2 AlC MAX phase powder. The Cr 2 AlC powder was prepared by using the in‐house facility, based on the method reported earlier . The sieved Ni–Mo–Al (~325 sieves) mixture was mixed with 20 wt% of Cr 2 AlC MAX phase material by turbo mixture for 2 hours.…”

Section: Methodssupporting

confidence: 80%

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr₇C₃–Al₂O₃ composite coating

Davis

Anandhan²,

Singh

2019

Int J Applied Ceramic Tech

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The present investigation focuses on the effect of Cr2AlC MAX phase addition on erosion and oxidation‐induced crack healing behavior of Ni–Mo–Al alloy. For this, Ni–Mo–Al and 20 wt% Cr2AlC‐blended Ni–Mo–Al powders were coated by Air Plasma Spray (APS). For oxidation‐induced crack healing studies, the samples were heat treated at 500, 800, and 1100°C in the air for 5 hours. The heat‐treated samples were analyzed by X‐Ray Diffraction (XRD) analysis, Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS) for the phases, morphology, and composition. Erosion behavior studies were carried out at 30, 250, 500, 800, and 1000°C temperatures. The average hardness was obtained to be 400 ± 10 HV for Ni–Mo–Al coating and 580 ± 10 HV for 20 wt% Cr2AlC‐blended Ni–Mo–Al coating. The addition of Cr2AlC MAX into Ni–Mo–Al matrix reduces the overall erosion rate and improved the crack healing ability. This was attributed to the presence of in‐situ‐formed Cr7C3 and Al2O3 phases.

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Section: Methodssupporting

confidence: 80%

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr₇C₃–Al₂O₃ composite coating

Davis

Anandhan²,

Singh

2019

Int J Applied Ceramic Tech

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“…The preparation of nanofluids is mainly fallen into the two‐steps. In the first step, the Cr 2 AlC powder was prepared (65 μm, high purity) by using the in‐house facility, based on the method reported earlier . h‐Boron nitride, molybdenum disulfide, and alumina powders of about −325 mesh size with about 99.2% purity were obtained from Loba Chemie, Mumbai, India.…”

Section: Methodsmentioning

confidence: 99%

Development of ethylene glycol‐Cr₂AlC nanofluid for thermal management in the automotive sector

Davis

Saleem

Shah

et al. 2019

Int J Applied Ceramic Tech

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The current study is focused on the development of a novel nanofluid for efficient thermal management in the automotive sector. For this, novel Cr 2 AlC-based nanofluids were prepared and its properties were compared with conventional nanofluids prepared under similar condition. h-BN, MoS 2 , Al 2 O 3 , and Cr 2 AlC powders of <60 nm were prepared by high energy ball mill and were added into the EG fluid in 0.25 and 0.50 wt%. The nanofluids were investigated for viscosity, flash point, fire point, thermal conductivity, stability, and freezing temperature. The flash and fire points of EG increase with the addition of nanocrystalline powders. The viscosity of nanofluids decreases and thermal conductivity increases with increase in temperature. Among all addition, nanofluid containing 0.50 wt% of Cr 2 AlC shows maximum enhancement in the thermal conductivity and freezing temperature by 57.91% and 42.15%, respectively. It also shows a good stability up to 20 days. K E Y W O R D S cooling agent, Cr 2 AlC MAX Phase, ethylene glycol, nanofluids, thermal conductivity 1072 | DAVIS et Al.

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“…In addition Cr 2 AlC has been successfully synthesized and the main radiation induced defects have been determined 15, 16 . Depending on the processing conditions, small amounts of Cr 3 C 2 , Cr 7 C 3 and Cr 5 Al 8 can be present in the material 17 although generally speaking Cr 2 AlC has been synthesized (at the moment) with higher purity than Zr 2 AlC.…”

Section: Introductionmentioning

confidence: 99%

Point defect formation in M2AlC (M = Zr,Cr) MAX phases and their tendency to disorder and amorphize

Shah

Bristowe

2017

Sci Rep

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First principles calculations are performed on Zr2AlC and Cr2AlC MAX phases to compare their ability to accommodate point defects under irradiation. Interatomic bonding is stronger in Cr2AlC than Zr2AlC but contrary to expectation Zr2AlC exhibits higher vacancy and antisite pair formation energies. However, interstitials and Frenkel defects are generally more difficult to form in Cr2AlC. The results are attributed to the mixed covalent/ionic/metallic nature of the bonding. Detailed comparison of all the energies suggests that the preferred defects in Zr2AlC and Cr2AlC are the VAl+Ali Frenkel and CrAl+AlCr antisite respectively. Thus the potential response of the two phases to irradiation is different and taking account of other competing defects it is suggested that Zr2AlC is less susceptible to amorphization.

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Thermodynamic Assessments and mechanically activated synthesis of ultrafine Cr 2 AlC MAX phase powders

Cited by 25 publications

References 30 publications

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr₇C₃–Al₂O₃ composite coating

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr₇C₃–Al₂O₃ composite coating

Development of ethylene glycol‐Cr₂AlC nanofluid for thermal management in the automotive sector

Point defect formation in M2AlC (M = Zr,Cr) MAX phases and their tendency to disorder and amorphize

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Thermodynamic Assessments and mechanically activated synthesis of ultrafine Cr 2 AlC MAX phase powders

Cited by 25 publications

References 30 publications

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr7C3–Al2O3 composite coating

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr7C3–Al2O3 composite coating

Development of ethylene glycol‐Cr2AlC nanofluid for thermal management in the automotive sector

Point defect formation in M2AlC (M = Zr,Cr) MAX phases and their tendency to disorder and amorphize

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About

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr₇C₃–Al₂O₃ composite coating

Oxidation‐induced crack healing and erosion life assessment of Ni–Mo–Al–Cr₇C₃–Al₂O₃ composite coating

Development of ethylene glycol‐Cr₂AlC nanofluid for thermal management in the automotive sector