Oxidation behaviour of Ti3SiC2-based ceramic at 900–1300°C in air

Sun, Zhimei; Zhou, Yanchun; Li, Meishuan

doi:10.1016/s0010-938x(00)00142-6

Cited by 173 publications

(116 citation statements)

References 12 publications

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“…Effect of TiC on the oxidation resistance of bulk Ti 3 AlC 2 based materials Previous works on the oxidation of Ti 3 SiC 2 with isotypic structure to Ti 3 AlC 2 has shown that TiC has deleterious effect on the oxidation kinetics [23,24]. In addition, Barsoum claims that protective -Al 2 O 3 layer is not formed on Ti 3 AlC 2 material [25] while our earlier work reveals that protective -Al 2 O 3 layer is formed on monolithic Ti 3 AlC 2 [6].…”

Section: Cross-section Morphologymentioning

confidence: 99%

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

Wang

Zhou

2003

Materials Research Innovations

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The isothermal oxidation behavior of Ti 3 AlC 2 based material containing 5 vol% TiC inclusion in air had been investigated at 500-900 C by means of TGA, XRD, Raman spectroscopy and SEM/EDS. It was demonstrated that, although Ti 3 AlC 2 based material exhibited good oxidation resistance at temperatures above 700 C, anomalous oxidation with higher oxidation rate occurred at lower temperatures of 500 and 600 C. This interesting phenomenon was due to the formation of microcracks associated with the stress developed within the scales, mainly consisting of anatase, and the volume expansion as Ti 3 AlC 2 based material was directly exposed to air at those temperatures. Its oxidation, at temperatures investigated with the exception of 600 C, generally obeyed a parabolic rate law. The weight gain data for the remaining temperatures were analyzed with an instantaneous parabolic rate constant method by assuming a parabolic rate law. The variations of instantaneous parabolic rate constant with time reflected the complexity of the oxidation behavior of Ti 3 AlC 2 based material. These variations were discussed from the viewpoint of the formation of microcracks at 500 C, and preferred oxidation of TiC inclusion in the initial oxidation and its subsequent depletion at 800 and 900 C on the basis of X-ray diffraction, Raman spectroscopy, SEM scale morphology observation and composition analysis using EDS. In addition, the deleterious effect of TiC inclusion on the oxidation resistance of Ti 3 AlC 2 based material was also investigated and discussed with comparison to monolithic Ti 3 AlC 2 , which was helpful to understand the discrepancies in reports on the oxidation of Ti 3 AlC 2 .

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Section: Cross-section Morphologymentioning

confidence: 99%

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

Wang

Zhou

2003

Materials Research Innovations

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“…They are thermally and electrically conductive, thermal shock resistant, machinable and damage tolerant like metals; also they have low density, high elastic stiffness and exhibit oxidation resistance like ceramics. For instance Ti3SiC2 and Ti3AlC2 show a substantial resistance to creep, fatigue and oxidation [46][47][48][49].…”

Section: Properties Of Max Phasesmentioning

confidence: 99%

Synthesis and Characterization of 2D Nanocrystals and Thin Films of Transition Metal Carbides (MXenes)

Halim¹

2014

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Two dimensional (2D) materials have received growing interest because of their unique properties compared to their bulk counterparts. Graphene is the archetype 2D solid, but other materials beyond graphene, such as MoS2 and BN have become potential candidates for several applications. Recently, a new family of 2D materials of early transition metal carbides and carbonitrides (Ti2CTx, Ti3C2Tx, Ti3CNTx, Ta4C3Tx, and more), labelled MXenes, has been discovered, where T stands for the surface-terminating groups. Before the present work, MXenes had only been synthesized in the form of exfoliated and delaminated powders, which is not suitable for electronic applications. In this thesis, I demonstrate the synthesis of MXenes as epitaxial thin films, a more suitable form for electronic and photonic applications. Results show that 2D epitaxial Ti3C2Tx films - produced by HF and NH4HF2 etching of magnetron sputter-grown Ti3AlC2 - exhibit metallic conductive behaviour down to 100 K and are 90% transparent to light in the visible-infrared range. The results from this work may open the door for MXenes as potential candidates for transparent conductive electrodes as well as in electronic, photonic and sensing applications. MXenes have been shown to intercalate cations and molecules between their layers that in turn can alter the surface termination groups. There is therefore a need to study the surface chemistries of synthetized MXenes to be able to study the effect of intercalation as well as altering the surface termination groups on the electronic structure and chemical states of the elements present in MXene layers. X-ray Photoelectron Spectroscopy (XPS) in-depth characterization was used to investigate surface chemistries of Ti3C2Tx and Ti2CTx. This thesis includes the discussion of the effect of Ar+ sputtering and the number of layers on the surface chemistry of MXenes. This study serves as a baseline for chemical modification and tailoring of the surface chemistry groups to potential uses and applications. New MXene phases, Nb2CTx and V2CTx, are shown in this thesis to be produced from HF chemical etching of Nb2AlC and V2AlC powders. Characterization of the produced MXenes was carried out using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Transmission Electron Microscope (TEM) and XPS. Nb2CTx and V2CTx showed promising performance as electrodes for Li-ion batteries. In this thesis, electrochemical etching was used in an attempt to produce 2D metal carbides (MXene) from their ternary metal carbides, Ti3SiC2, Ti3AlC2 and Ti2AlC MAX phases. MAX phases in the form of highly dense bulk produced by Hot Isostatic Press. Several etching solutions were used such as HF, NaCl and HCl. Unlike the HF chemical etching of MAX phases, which results in MXenes, the electrochemical etching resulted in Carbide Derived Carbon (CDC). Here, I show the characterization of the produced CDC using several techniques such as XRD, TEM, Raman spectroscopy, and XPS. Electrochemical characterization was performed in the form of cyclic ...

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“…The MAX phases are typical representatives of nanolaminated phases, and according to M. W. Barsoum et al [2,3], these phase characterized by high elastic moduli, are machinable [4], exhibit good damage tolerance [5], excellent thermal shock resistance [6], and good corrosion resistance [7], and they are good thermal and electrical conductors [4]. This unique combination of properties serves as motivation for fundamental as well as applied research.…”

Section: Introductionmentioning

confidence: 99%