Synthesis of high-temperature Mo5SiB2 based ceramics in the combustion mode
https://doi.org/10.17073/1997-308X-2013-3-54-60
Abstract
The work is devoted to the synthesis and investigation of ceramic material on the basis of Mo5SiB2 chemical compound (T2-phase). The effect of initial temperature on key parameters of combustion process is shown. It is found that reaction mixture preheating allows initiating combustion in the self-oscillatory mode, thus initial temperature dependences of combustion temperature and rate have linear character. The effective SHS- process activation energy value is calculated. Some variants of chemical reactions between Mo, Si and B are proposed for explanation of the com- bustion mechanism in the examined ternary system. Compact samples are obtained using the power SHS-compaction. The phase composition, structure, and properties of synthesized ceramic materials, in which Mo5SiB2 grains are the basic component with average size of 10–20 μm, have been studied. The lines of Mo3Si and Mo intermediate phases, which total fraction does not exceed 4 %, are identified as well. The produced T2- phase based material possesses high specific density and hardness.
About the Authors
Yu. С. PogozhevRussian Federation
A. Yu. Potanin
Russian Federation
E. A. Levashov
Russian Federation
A. V. Novikov
Russian Federation
T. A. Sviridova
Russian Federation
N. A. Kochetov
Russian Federation
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Review
For citations:
Pogozhev Yu.С., Potanin A.Yu., Levashov E.A., Novikov A.V., Sviridova T.A., Kochetov N.A. Synthesis of high-temperature Mo5SiB2 based ceramics in the combustion mode. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2013;(3):54-60. (In Russ.) https://doi.org/10.17073/1997-308X-2013-3-54-60