Probing the oxidation behavior of Ti₂AlC MAX phase powders between 200 and 1000 °C

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• 作者：Zheng Zhang^a ; Suo Hon Lim^a ; Doreen Mei Ying Lai^a ; Sze Yu Tan^a ; Xue Qi Koh^a ; Jianwei Chai^a ; Shi Jie Wang^a ; Hongmei Jin^b ; Ji Sheng Pan^a ; ^{js-pan@imre.a-star.edu.sg" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ti2AlC ; MAX phase ; Oxidation ; Surface segregation ; Self-healing
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：37
• 期：1
• 页码：43-51
• 全文大小：4002 K

文摘

Oxidation of commercial Ti₂AlC MAX phase powders at 200–1000 °C has been investigated by XRD, XPS, SEM, STA and TGA coupled with FTIR. These powders are a mixture of Ti₂AlC, Ti₃AlC₂, TiC and Ti_1.2Al_0.8. Oxidation at 400 °C led to disappearance of carbide phases from Ti 2p, Al 2p and C 1s XPS spectra. At 600 °C, powders changed from dark grey to light grey with a significant volume increase due to crack formation. Powders were severely oxidized by detecting rutile with minor anatase TiO₂. At 800 °C, α-Al₂O₃ was detected while anatase transformed into rutile TiO₂. The cracks were healed and disappeared. At 1000 °C, the Ti₂AlC powders were fully oxidized into rutile TiO₂ and α-Al₂O₃ with a change of powder color from light grey to yellow. FTIR detected the release of C as CO₂ from 200 °C onwards but with additional CO above 800 °C.