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Title

The synthesis of composite materials based on MAX-phase Ti₃SiC₂ containing borides

Authors

N.I. Afanasyev, O.K. Lepakova

Organization

Tomsk Scientific Centre SB RAS
Tomsk, Russian Federation

Abstract

The microstructure, phase composition, and heat resistance of MAX-the Ti₃SiC₂ phase and the composite nanolaminate compound Ti₃SiC₂-B obtained by the method of self-propagating hightemperature synthesis in layer-burning mode are investigated. The synthesis process was carried out in a constant pressure bomb in an argon atmosphere. A wave of gasless burning was initiated by a red-hot tungsten spiral. The maximum burning temperature was determined by tungstenrhenium thermocouple W + 5% Re-W + 20% Re. The phase composition and structural parameters of the obtained materials were determined on Shimadzu XRD-6000 diffractometers (CuKα radiation) and DRON-2 (CoKα radiation). Quantitative phase analysis was performed using the POWDER CELL 2,4 program. An optical microscope (Axiovert 200M, Karl Zeiss) was used to study the microstructure. It was established that boron is not included in the composition of the MAX solid solution at a concentration of less than 0,2 mol. %. Products with a boron content of more than 0,2 mol. % contain dispersed particles of titanium diboride located between the MAX-phase plates. The tests for heat resistance at a temperature of 1373 K showed that the composite materials based on the Ti₃SiC₂ compound studied in this work correspond to the heat resistance of the stoichiometric phase and surpass the Ni-Cr-Al-Y system alloys, which are widely used to protect parts of a gas turbine engine. The abrasive wear resistance of the composite material is 1,6 times higher than that of the MAX-phase and 2,8 times higher than the wear resistance of the Ni-Cr-Al-Y alloy. The resulting materials are promising for use as heat-resistant and wear-resistant coatings.

Keywords

MAX phase, self-propagating high-temperature synthesis, phase composition, heat resistance

References

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For citing this article

Afanasyev N.I., Lepakova O.K. The synthesis of composite materials based on MAX-phase Ti₃SiC₂ containing borides // Spacecrafts & Technologies, 2018, vol. 2, no. 4, pp. 225-228. doi: 10.26732/2618-7957-2018-4-225-228

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