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EFFECT OF GRANULATION, MECHANICAL ACTIVATION, THERMOVACUUM TREATMENT AND AMBIENT GAS PRESSURE ON TI–0,5C SYSTEM SYNTHESIS REGULARITIES

https://doi.org/10.17073/1997-308X-2017-3-4-13

Abstract

This paper studies dependences of combustion velocities and changes in sample relative lengths from ambient pressure and thermovacuum degassing (TVD) time for the Ti + 0,5C mixture. It was shown that Ti + 0,5C mixture TVD significantly (doubly) increase combustion velocity as well as sample shrinkage. Sample shrinkage occurs under the influence of surface tension due the sufficient quantity of a liquid phase in combustion products that ensure their low viscosity. It was not possible before to obtain pressed samples from the mechanically activated (MA) Ti + C mixture because of their low strength, and therefore to investigate their combustion regularities. To solve this problem, the authors used preliminary granulation of the initial Ti + 0,5C mixture before MA. As a result, dependences of combustion velocity and post-combustion changes in sample lengths from MA time were obtained for the first time ever for the Ti + 0,5C preliminary granulated mixture. It was found that mechanical activation decreases mixture combustion velocity and significantly (triply) increases sample elongation after combustion. Combustion velocity after MA mixture TVD reaches combustion velocity of initial mixtures at the same TVD time. The samples of condensed reaction products from the MA mixture retained a slight elongation (within 8 %) after TVD. X-ray phase analysis revealed no reaction products formed during MA. Combustion products of all mixtures (initial, activated mixture and activated granules) contain the Ti2C phase and Ti traces. X-ray analysis of the initial and MA mixtures shows peaks intensity broadening and reduction of peak intensity to the background intensity ratio after MA thus indicating a higher defect rate in the crystal structure of the components of mixtures. This effect intensifies with an increase in activation time. The study results are interpreted based on the conduction – convection model of reaction wave propagation.

About the Authors

N. A. Kochetov
Institute of Structural Macrokinetics and Materials Science RAS
Russian Federation

Cand. Sci. (Phys.-Math.), Senior researcher, Laboratory of dynamics of microheterogeneous processes,

143432, Moscow reg., Chernogolovka, Academician Osipyan str., 8


B. S. Seplyarskii
Institute of Structural Macrokinetics and Materials Science RAS
Russian Federation

Cand. Sci. (Phys.-Math.), Head of the Laboratory of combustion of dispersed systems, 

143432, Moscow reg., Chernogolovka, Academician Osipyan str., 8


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Review

For citations:

Kochetov N.A., Seplyarskii B.S. EFFECT OF GRANULATION, MECHANICAL ACTIVATION, THERMOVACUUM TREATMENT AND AMBIENT GAS PRESSURE ON TI–0,5C SYSTEM SYNTHESIS REGULARITIES. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2017;(3):4-13. https://doi.org/10.17073/1997-308X-2017-3-4-13

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ISSN 1997-308X (Print)
ISSN 2412-8767 (Online)

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