Abstract
The features of SHS processes in the powder mixture Ti-Cr-Al-C are studied. It is shown that an increase in the chromium content in the mixture lowers the maximum temperature of the combustion wave front. When the chromium content in the mixture is above 20 wt. % process goes into non-stationary combustion mode. The nanolaminate phases Ti2AlC, Ti3AlC2, or their mixture are formed when the chromium content is up to 20 wt.%. Chromium is embedded in the crystal lattice of MAX phases, replacing titanium in the crystal lattice. The introduction of chromium increases the resistance of the material to oxidation. Samples of composition Ti1.1Cr0.9AlC are not inferior in oxidation resistance to materials based on Cr2AlC. However, their synthesis, in contrast to Cr2AlC, is possible in the autowave mode of SHS at room temperature. This allows them to be recommended for use in parts operating under extreme operating conditions, such as electrical contacts, bearings, heating elements, heat exchangers, as high-temperature ceramics.
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