High-Temperature Synthesis of Cr-Mo-Al-C Materials

We report high-temperature synthesis of cast composite materials in the Cr-Mo-Al-C system. (Cr1-xMox)(2)AlC -based materials have been prepared for the first time from a Cr2O3 + MoO3 + Al + C powder mixture by self-propagating high-temperature synthesis in the combustion regime. The synthesis was carried out in a 3-L reactor at an argon pressure of 5 MPa. The composition of the starting mixture has been shown to influence the phase composition and structure of the synthesis products. The synthesized materials contain (Cr1-xMox)(2)AlC and (MoxCr1-x)(3)Al2C phases of variable composition and secondary chromium and molybdenum carbides and intermetallic phases. The materials have been characterized by X-ray diffraction and electron microscopy.