MAX phase materials have attracted increased attention due to their unique combination of ceramic and metallic properties. In this study, the properties of vacancies in Ti3AlC2 and Ti3SiC2, which are two of the most widely studied MAX phases, were investigated using first-principles calculations. Our calculations indicate that the stabilities of vacancies in Ti3SiC2 and Ti3AlC2 differ greatly f...

Porous Ti3SiC2 was fabricated with high purity, 99.4 vol %, through reactive sintering of titanium hydride (TiH2), silicon (Si) and graphite (C) elemental powders. The reaction procedures and the pore structure evolution during the sintering process were systematically studied by X-ray diffraction (XRD) and scanning electron microscope (SEM). Our results show that the formation of Ti3SiC2 from ...

II The cover image shows partial intercalation of gold (in yellow) into Ti3SiC2 observed by scanning transmission electron microscopy; a result from my research. During the course of research underlying this thesis, I was enrolled in Agora Materiae, a multidisciplinary doctoral program at Linköping University, Sweden. Abstract Chemical gas sensors are widely-used electronic devices for detectin...

Ternary compound Ti3SiC2 was successfully synthesized by pulse discharge sintering (PDS) for Ti/Si/TiC powder mixtures with different molar ratios, where coarse Ti powder ( 0:15mm) was used. When the molar ratio of Ti:Si:TiC was selected to be 2:2:3, the content of Ti3SiC2 reached 97.8% and density reached 99.0% after sintering at 1450 C for 20min under 50MPa load. The Ti-Si liquid reaction occ...

The synthesis, characterization, and first-principles calculations of Ti3SiC2/Al2O3 ceramics were reported. X-ray diffraction measurements showed that the composite highly pure. Scanning electron microscopy transmission used to characterize interface information for Ti3SiC2 Al2O3 crystals. Surface energies properties calculated using method. results suggested with Ti terminations O are more sta...

This paper examines the idea that reversible hysteresis in MAX phases is caused by the formation, growth and collapse of unstable, or incipient, kink bands. In situ X-ray diffraction of polycrystalline Ti3SiC2 in compression showed that residual elastic lattice strains developed during the first loading cycle and remained approximately constant afterwards. These residual strains were compressiv...

Barsoum and El-Raghy [1] have recently developed reactive hot-pressing techniques to form bulk, polycrystalline Ti3SiC2 from powders of Ti, SiC, and graphite. This ternary carbide, first synthesized by Jeitschko and Nowotny [2] in the late 1960s, exhibits a rather surprising combination of properties. Not only is the ratio of hardness (;4 GPa) to elastic modulus (;320 GPa) more typical of ducti...

We employ monochromatized electron energy loss spectroscopy to study Ti3SiC2 and Ti3AlC2. By probing individual grains aligned along different axes in bulk polycrystalline Ti3SiC2 and Ti3AlC2, this approach enables determination of the anisotropy of the dielectric functions and an estimate of the free-electron lifetime in different orientations. The dielectric functions are characterized by str...

The paper describes micro structural observation (LM and SEM), which has been made on quick-stop sectioned samples of the chip formation, either on metals (high-speed steels) and Ti3SiC2 ceramic. All milling tests were carried out using a “quick-stop” method developed by the authors. For micro structural analysis samples were prepared by standard metallographic technique and examined with a lig...