Open AccessSHS-synthesis of nanolaminate materials of the system Ti-Cr-Al-C and their term-oxidative stability
Author(s) -
А. М. Шульпеков,
O. K. Лепакова,
N. I. Afanasyev
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1709/1/012021
Subject(s) - chromium , materials science , combustion , titanium , ceramic , metallurgy , chemical engineering , crystal structure , chemistry , crystallography , engineering
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 Ti 2 AlC, Ti 3 AlC 2 , 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 Ti 1.1 Cr 0.9 AlC are not inferior in oxidation resistance to materials based on Cr 2 AlC. However, their synthesis, in contrast to Cr 2 AlC, 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.