Oxidation behavior of Cr2AlC ceramics at 1,100 and 1,250 °C

Tian, Wenbin; Wang, Pei-Ling; Kan, Yanmei; Zhang, Guojun

doi:10.1007/s10853-008-2516-2

Cited by 99 publications

(83 citation statements)

References 19 publications

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“…For example, the CTE of Rene′N5 is~16.0 (×10 −6 /°C) as compared 8.2 for Ti 2 AlC, 9.3 for Al 2 O 3 and 11.3 for YSZ [12,26,27]. The CTE measured for Ti 2 AlC in the present study was 10.2 × 10 − 6 /°C over the 700-1300°C range.…”

Section: Residual Stress and Strain Energy Factorsupporting

confidence: 43%

Oxidative durability of TBCs on Ti2AlC MAX phase substrates

Smialek

Harder

Garg

2016

Surface and Coatings Technology

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Air plasma spray (APS) and plasma-spray-physical vapor deposition (PS-PVD) yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBC),~80-100 μm thick, were produced on a commercial Ti 2 AlC MAX phase compound. They were oxidized in interrupted furnace tests for 500 h each, at five successive temperatures from 1100°-1300°C. The APS coating survived 2400 accumulated hours, failing catastrophically after 500 h at 1300°C. Porosity, large cracks, sintering, and high monoclinic YSZ phase contents were seen as primary degradation factors. The PS-PVD coating remained completely intact over 2500 total hours (65 cycles) including 500 h at 1300°C, exhibiting only fine porosity and microcracking, with less monoclinic. These Ti 2 AlC systems achieved a minimum α-Al 2 O 3 scale thickness of 29 and 35 μm, respectively, as compared to~6 ± 2 μm on average at failure for conventional bond coats on superalloys. Accordingly, times predicted from thermogravimetric analyses (TGA) of oxidation kinetics project an improvement factor of~25-50× for the time to achieve these scale thicknesses at a given temperature. Extreme oxidative TBC durability is achieved because the thermal expansion coefficient of Ti 2 AlC is only slightly different than those for α-Al 2 O 3 and YSZ. The strain energy term driving scale and TBC failure is therefore believed to be fundamentally diminished from the large compressive stress produced by higher expansion superalloys.Published by Elsevier B.V.

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Section: Residual Stress and Strain Energy Factorsupporting

confidence: 43%

Oxidative durability of TBCs on Ti2AlC MAX phase substrates

Smialek

Harder

Garg

2016

Surface and Coatings Technology

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“…They are nanolamellas with M n+1 AX n (n is 1, 2, or 3) chemical formula, where M is an early transition metal, A is an A-group element from the periodic table and X is either carbon or nitrogen [1]. These compounds are known for their low density [1], high stiffness [2,3], superior thermal shock resistance [1,4], damage tolerance [5,6], self-healing behavior [7,8], significant electrical conductivity [4,9], and erosion [10], oxidation [11][12][13][14][15][16] and hot corrosion resistance [6,17]. Moreover, M n+1 AX n phases have been identified as promising candidates for hydrogen storage applications [18] along with other materials [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…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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“…In recent decades, a significant number of literatures have reported the oxidation of MAX phases at high temperature [3][4][5][6][7][8][9][10][11][12]. For example, Ti 3 AlC 2 has excellent oxidation resistance, which is attributed to the formation of two-layer dense and adherent passivating films.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of Ti3AlC2 in molten KOH at 700 °C

Sun

Zhou

et al. 2013

J Adv Ceram

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This paper investigated the corrosion behaviors of Ti 3 AlC 2 at 700 ℃ in molten KOH with various mass ratios. If the mass ratio of KOH:Ti 3 AlC 2 ≤2, Ti 3 AlC 2 can resist KOH hot corrosion in 2 h. Ti 3 AlC 2 suffered serious corrosion attack if the mass ratio≥3. The main compositions of corroded samples were amorphous graphite and potassium titanates (K 2 O·nTiO 2 ). If the samples were washed by acid and dried, potassium titanates could decompose to K 2 O and amorphous rutile. Based on the experimental results, a corrosion mechanism of Ti 3 AlC 2 in molten KOH was proposed.

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Oxidation behavior of Cr2AlC ceramics at 1,100 and 1,250 °C

Cited by 99 publications

References 19 publications

Oxidative durability of TBCs on Ti2AlC MAX phase substrates

Oxidative durability of TBCs on Ti2AlC MAX phase substrates

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

Corrosion behavior of Ti3AlC2 in molten KOH at 700 °C

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