Oxidation behavior of TiC-containing Ti<sub>3</sub>AlC<sub>2</sub>based material at 500–900 °C in air

Wang, Xiao Hui; Zhou, Yanchun

doi:10.1007/s10019-003-0278-7

Cited by 41 publications

(25 citation statements)

References 25 publications

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“…Black powders are found at the bottom of alumina crucible near the end of the cyclic oxidation experiment at 550 • C, which are thought to have spalled from the oxidized surfaces. Recault et al [21] and Zhou and co-workers [13] also found similar microcracks during the oxidation of Ti 3 SiC 2 at 650 • C and Ti 3 AlC 2 at 500 • C, respectively. According to them, the formation of microcracks was the result of growth stress caused by volume expansion associated with the oxidation of Ti 3 SiC 2 and Ti 3 AlC 2 into anatase TiO 2 .…”

Section: Surface Morphologymentioning

confidence: 64%

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Cyclic oxidation behavior of TiC/Ti3AlC2 composites at 550–950°C in air

Qian

Sun

et al. 2010

Journal of Alloys and Compounds

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Section: Surface Morphologymentioning

confidence: 64%

“…The isothermal oxidation properties of Ti 3 AlC 2 have been extensively investigated [10][11][12][13][14]. Barsoum developed the oxidation mode of Ti 3 AlC 2 and found layered scales after long time oxidation.…”

Section: Introductionmentioning

confidence: 99%

Cyclic oxidation behavior of TiC/Ti3AlC2 composites at 550–950°C in air

Qian

Sun

et al. 2010

Journal of Alloys and Compounds

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“…20 For the sample hot corroded at 800°C, the intensity of the diffractions from TiO 2 ͑rutile͒ was greater than that of Ti 3 AlC 2 . ␣-Al 2 O 3 was also detected.…”

mentioning

confidence: 88%

Hot Corrosion of Na[sub 2]SO[sub 4]-Coated Ti[sub 3]AlC[sub 2] in Air at 700-1000°C

Wang

Zhou

2004

J. Electrochem. Soc.

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Hot corrosion of layered machinable ceramic Ti 3 AlC 2 coated with 3.8 Ϯ 0.2 mg/cm 2 Na 2 SO 4 in air at 700-1000°C has been investigated by means of thermogravimetric analysis, X-ray diffraction, Raman spectroscopy, and scanning electron microscopy/ energy-dispersive spectroscopy. The hot corrosion of Ti 3 AlC 2 was slight at low temperatures of 700 and 800°C, while Ti 3 AlC 2 was severely attacked by fused sodium sulfate at 900 and 1000°C. No protective scales were observed on Ti 3 AlC 2 , and sulfur-rich layers were present at the Ti 3 AlC 2 substrate/scale interface. The linear hot corrosion kinetics at 800 and 900°C demonstrated that electrochemical reactions of Ti 3 AlC 2 with sodium sulfate at the substrate/scale interface dominated, while the parabolic kinetics at 1000°C implied that the rate-limiting step involved in the hot corrosion was the diffusion of hot corrosion medium through the scale formed. The hot corrosion behaviors were explained by a mechanism of electrochemistry coupled with basic dissolution-precipitation. Two-layered machinable ternary carbides, Ti 3 AlC 2 and Ti 2 AlC, in the Ti-Al-C system, are of interest as potential high-temperature structural materials due to their high specific strength and excellent high-temperature properties.1,2 Ti 3 AlC 2 and Ti 2 AlC exhibit good oxidation resistance due to the formation of a protective ␣-Al 2 O 3 layer at high temperatures in spite of the low aluminum content. 3,4 Moreover, in contrast to traditional carbide ceramics, they can be readily machined by both conventional tools originating from the relatively weak bonding between sheets of Ti 6 C octahedra and neighboring close-packed Al atoms, 5 and by electrodischarge machining because of its high electrical conductivity. 1,2As a potential high-temperature structural material, Ti 3 AlC 2 will always be exposed to the service circumstance in which hot corrosion occurs. Hot corrosion became a topic of popular interest in the late 1960s as gas turbine engines of military aircraft suffered severe corrosion during the Vietnam conflict when operating over seawater. 6 Metallographic inspection of failed parts often showed sulfides of nickel and chromium, so the mechanism was initially called sulfidation. However, studies by Goebel and Pettit 7 and by Bornstein and DeCrescente 8,9 showed that sulfide formation indeed resulted from the reaction of the metallic substrate with a thin film of fused salt of sodium sulfate base rather than with Na 2 SO 4 vapor. Because corrosion by a thin electrolyte film bears some common features with ''atomospheric corrosion'' by an aqueous film at room temperature, the phenomenon has been renamed ''hot corrosion''. While aqueous atomospheric corrosion is often controlled by the diffusion of dissolved oxygen in the water film, numerous measurements have shown that the soluble oxidant in hot corrosion is SO 3 (S 2 O 7 2Ϫ ) in the fused salt. [10][11][12][13] It is well acknowledged that the subject of hot corrosion can be divided into two subtypes, i.e., hightemperature ...

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“…As a candidate of high-temperature structural material, Ti 3 AlC 2 was assumed to www.scichina.com www.springerlink.com be resistant to oxidation. Wang and Zhou et al [6][7][8] studied the oxidation of Ti 3 AlC 2 containing partial TiC in air at 500-1400℃. The results indicated that Ti 3 AlC 2 had excellent oxidation-resistance and the oxidation behavior generally obeyed parabolic law.…”

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confidence: 99%

Study on the isothermal oxidation behavior in air of Ti3AlC2 sintered by hot pressing

Mei

et al. 2006

SCI CHINA SER E

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The isothermal oxidation behavior at 900-1300℃ for 20 h in air of bulk Ti 3 AlC 2 with 2.8 wt% TiC sintered by means of hot pressing was investigated in the work. The isothermal oxidation behavior generally followed a parabolic rate law. The parabolic rate constants increased from 1.39×10 −10 kg 2 ·m −4 ·s −1 at 900℃ to 5.56×10 −9 kg 2 ·m −4 ·s −1 at 1300℃. The calculated activation energy was 136.45 kJ/mol. It was demonstrated that Ti 3 AlC 2 had excellent oxidation resistance due to the continuous, dense and adhesive protect scales consisted of a mass of α-Al 2 O 3 and a little of TiO 2 and/or Al 2 TiO 5 . In principle, the oxide scale was grown by the inward diffusion of O 2-and the outward diffusion of Ti 4+ and Al 3+ . The rapid outward diffusion of cations usually resulted in the formation of cracks, gaps, and holes.Recently, a series of researches with the beginning of investigation on Ti 3 SiC 2 attracted more and more attention of the material and physical scientists [1][2][3][4][5] . The special class of compounds introduced by the researches usually were classified as ternary laminated ceramics called M n+1 AX n , where M is a transition metal, A is a IIIA or IVA element and X is either carbon and/or nitrogen, n = 1, 2, 3. Ti 3 AlC 2 which is a typical ternary laminated ceramic has hexagonal crystal structure with space group of D 4 6h -P6 3 /mmc and the crystal lattices, a = 0.30753 nm and c = 1.8578 nm. The theoretical density is 4.25 g/cm 3 [5] .Similar to the other ternary compounds, Ti 3 AlC 2 combines the merits of metals and ceramics. As a candidate of high-temperature structural material, Ti 3 AlC 2 was assumed to

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Oxidation behavior of TiC-containing Ti₃AlC₂based material at 500–900 °C in air

Cited by 41 publications

References 25 publications

Cyclic oxidation behavior of TiC/Ti3AlC2 composites at 550–950°C in air

Cyclic oxidation behavior of TiC/Ti3AlC2 composites at 550–950°C in air

Hot Corrosion of Na[sub 2]SO[sub 4]-Coated Ti[sub 3]AlC[sub 2] in Air at 700-1000°C

Study on the isothermal oxidation behavior in air of Ti3AlC2 sintered by hot pressing

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Oxidation behavior of TiC-containing Ti3AlC2based material at 500–900 °C in air

Cited by 41 publications

References 25 publications

Cyclic oxidation behavior of TiC/Ti3AlC2 composites at 550–950°C in air

Cyclic oxidation behavior of TiC/Ti3AlC2 composites at 550–950°C in air

Hot Corrosion of Na[sub 2]SO[sub 4]-Coated Ti[sub 3]AlC[sub 2] in Air at 700-1000°C

Study on the isothermal oxidation behavior in air of Ti3AlC2 sintered by hot pressing

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Oxidation behavior of TiC-containing Ti₃AlC₂based material at 500–900 °C in air