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)
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