Abstract |
Composing of New Materials Using the
Method of Self-Propagating High-Temperature Synthesis in Presence of Ultrasonic
Vibrations
V.Klubovich, M.M.Kulak (Institute of
Technical Acoustics, Vitebsk, Belarus)
e-mail:
ita@vitebsk.by
One
of the promising techniques of the manufacture of new materials with a wide
complex of various properties is the method of self-propagating
high-temperature synthesis (SHS). The essence of the SHS method lies in
conducting the process in the regime of combustion due to exothermal reaction
of components without the use of considerable external heating. The distinctive
feature of this process is that the synthesis of final products occurs under
thermodynamically non-equilibrium conditions. The most important avenue of
successful evolution of the SHS method is the development of scientific
principles of controlling the SHS processes and the properties of synthesis
products, including the use of ultrasonic vibrations (USV). The subject of this
study is the influence of USV on the rate and maximum temperature of combustion
and the properties of synthesized titanium-silicon system. Main results: 1)
ultrasound results in an increase in the coefficient of heat transfer from the
surface of burning sample and a decrease in the rate and maximum temperature of
combustion; 2) the use of USV results in an increase in the completeness of
component reacting and a change in the phase composition of final products; 3)
the application of ultrasonic vibrations to the synthesis process increases the
uniformity of grain sizes.
Section
: 11