Cyclic oxidation of Cr2AlC between 1000 and 1300°C in air

Lee, D.B.; Nguyen, Thuan Dinh

doi:10.1016/j.jallcom.2007.10.018

Cited by 82 publications

(63 citation statements)

References 13 publications

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“…Hoskins 875 and PM2000) 1,2 and some Al-containing MAX phases (e.g. Ti 2 AlC, [3][4][5][6] Cr 2 AlC, [7][8][9][10] and Ti 3 AlC 2 ) 11-13 that form well adhering, protective Al 2 O 3 scales and follow approximately cubic oxidation kinetics up to 1400…”

Section: Isothermal and Cyclic Oxidation Of Moalb In Air From 1100mentioning

confidence: 99%

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Isothermal and Cyclic Oxidation of MoAlB in Air from 1100°C to 1400°C

Kota

Zapata-Solvas

Chen

et al. 2017

J. Electrochem. Soc.

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Like many FeCrAl-based alloys, and some MAX phases, the atomically laminated boride, MoAlB, forms slow-growing, adherent Al 2 O 3 scales when heated in air to 1350 • C. Herein the oxidation of MoAlB ceramics in air was studied in the 1100-1400 • C temperature range for up to 200 h. At 1400 • C, the oxide scale was heavily cracked and spalled. At 1100 • C, and up to 20 h, mass loss was recorded. At 1300 • C and 1350 • C, subparabolic, approximately cubic kinetics were observed, as a result of growth and coarsening of the Al 2 O 3 grains in the oxide scale. At 1200 • C, the weight gain kinetics were nearly linear, while the oxide thickening kinetics were approximately cubic likely due to cubic growth of Al 2 O 3 and concurrent volatility of constituents in the oxide scale. The cyclic oxidation resistance was also good for up to 125, 1-hour, cycles at 1200 • C. Analysis of grain coarsening and scale thickening kinetics suggest that oxygen grain boundary diffusivity is the rate controlling mechanism for the growth of Al 2 O 3 scales at 1300 • C and 1350 • C. Dimensional changes at samples' corners after long oxidation at T > 1200 • C may limit the maximum operational temperature of MoAlB.

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Section: Isothermal and Cyclic Oxidation Of Moalb In Air From 1100mentioning

confidence: 99%

“…Using the scale thickening (Table II) and grain coarsening data (Fig. 6a) 3,[9][10][11]34,35 Thus, it is likely that oxygen grain boundary diffusivity is also the rate controlling mechanism for the formation of Al 2 O 3 scales on MoAlB.…”

Section: -33 B) Evidence For Bubble Formation And/or Oxide Bucklingmentioning

confidence: 99%

Isothermal and Cyclic Oxidation of MoAlB in Air from 1100°C to 1400°C

Kota

Zapata-Solvas

Chen

et al. 2017

J. Electrochem. Soc.

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“…Since then, more than 70 compounds have been fabricated through physical vapor deposition and other methods [22,24]. In recent years, ternary carbide Cr 2 AlC has attracted much attention because of its excellent high-temperature oxidation and hot corrosion resistance [14,[25][26][27], due to preferential formation of continuous protective Al 2 O 3 oxide at high temperatures [15]. Moreover, a small difference in thermal expansion coefficients between Cr 2 AlC and Ni-based alloys makes them along with Cr 2 (Al x ,Ge 1−x )C, potential protective film candidates at high temperature [28,29].…”

Section: Introductionmentioning

confidence: 99%

Sputtering Power Effects on Growth and Mechanical Properties of Cr2AlC MAX Phase Coatings

Naveed

Obrosov

Żak

et al. 2016

Metals

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Abstract:Coating growth and mechanical properties of nanolamellar Cr 2 AlC coatings at various sputtering power were investigated in the present study. Cr 2 AlC coating was deposited on the IN 718 superalloy and (100) Si wafers by DC magnetron sputtering at different sputtering powers. The structure and properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nanoindentation. It was found that coatings had columnar structure with nanocrystalline substructure. Deposition rate increased with the sputtering power. XRD results showed the presence of the Cr 2 AlC MAX phase, intermetallic AlCr 2 and Cr 7 C 3 carbide phases, along with the change in preferential coating growth orientation. TEM observations confirmed the occurrence of these phases, and the SAED patterns demonstrated significant texture of the coatings. Hardness values were measured in the range between 11-14 GPa, showing a slight increase with the sputtering power.

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“…Its lattice parameters and phase relationship in the Cr-Al-C system were identified by Schuster et al [8]. In recent years, Cr 2 AlC has received increasing attention because of its remarkable properties, including relatively low hardness, high elastic modulus, high flexural and compression strength, good electric and thermal conductivity, and excellent oxidation and corrosion resistance [9][10][11][12][13][14]. Fabrication routes like hot pressing [11][12][13][14][15][16] and pulse discharge sintering [17][18][19] have been frequently used to prepare bulk Cr 2 AlC.…”

Section: Introductionmentioning

confidence: 99%