Long-time Oxidation of Ti3AlC2 between 400 and 800℃ in Air
- Long-time Oxidation of Ti3AlC2 between 400 and 800℃ in Air
- 김민정; 박상환; 이동복
- Titanium aluminum carbide; Oxidation; TiO2
- Issue Date
- Journal of ceramic processing research
- VOL 12, NO s3, s198-s204
- The air-oxidation behavior of bulk samples of Ti3AlC2 was investigated between 400 and 800 ℃ for 10 h~12 months, with an
emphasis being placed on elucidating the anomalous oxidation characteristics of Ti3AlC2 at 600 ℃. Ti3AlC2 oxidized faster than
TiAl, due to the abundance of Ti and carbon. At 800 oC, Ti3AlC2 oxidized to rutile-TiO2 and α-Al2O3. At 800 ℃, anatase-TiO2
transformed rapidly into the more stable rutile-TiO2, and Al2O3 also formed internally along the boundaries of lamellar matrix
grains underneath the oxide scale. At 600 ℃, Ti3AlC2 oxidized to TiO2 in the form of rutile, anatase, or amorphous, plus Al2O3
in the form of crystalline, or amorphous, depending on the oxidation time. The origin of anomalous oxidation is proposed as
the oxidation of Ti to TiO2, and the slow growth rate of alumina at intermediate temperatures. The formation of TiO2 resulted
in a volume expansion, cracking Ti3AlC2 seriously at 600 ℃.
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