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Single-phase bulk Cr 2 AlC, a non-Ti-containing carbide with superior expected properties, was successfully fabricated by in-situ hot pressing/solid-liquid reaction process. The reaction process was investigated using differential scanning calorimetry. The products were characterized using X-ray diffraction and scanning electron microscopy. Four distinguished stages of the reactions from Cr, Al, and C elemental powders were discussed. The obtained X-ray diffraction data are in good agreement with calculated ones and those from JCPDS card No. 29-0017. A new set of X-ray diffraction data comprising reflections, 2 θ , and intensities of Cr 2 AlC is presented. Lattice parameters obtained by Rietveld XRD refinement of Cr 2 AlC are  a  = 2.858 Å and  c  = 12.818 Å, respectively. The measured Vickers hardness of the as-synthesized Cr 2 AlC is 5.5 ± 0.4 GPa, which is twice that of Ti 2 AlC. Cr 2 AlC displays excellent oxidation resistance. The parabolic rate constant of Cr 2 AlC was decreased by 3 –4 orders of magnitude compared with those of Ti 3 SiC 2  at 1200 °C.

In-situ hot pressing/solid-liquid reaction synthesis of bulk Cr 2 AlC