Method of investigation the chemical bonding in tungsten obtained by radiation technology
Article is devoted to producing refractory metals and new structural materials with improved physicochemical and mechanical properties. The studies of the changes in the thermodynamic functions in phase transformations in solids are held. An experimental setup on the basis of hydroimpulse press T-1220 was used. A regularity of formation a strong chemical bond in the liquid-crystalline state compared to the initial sample was determined. Using the method of electroexplosive destruction, provided a high rate of conversion of electrical energy into mechanical work, it was found that exposure to high-voltage pulse electric current density of about 107 A/ cm2 for about 3·10-5 s. and with an operating voltage of 10 kV on the tungsten wire length of 45 mm and a diameter of 14,5 microns, obtained by industrial technology, leads to its complete destruction by explosive boiling, and the liquid metal layer is formed a connection - weld samples. Due to the high rate of heating of the metal conductor (106... 107 K/s.), in a short time it is possible to eliminate the influence of phase transitions when spraying high-voltage electric discharge. It was proved spatial inhomogeneity of electrons in the metal and fixed a melt of tungsten wire, obtained by radiation technology, which was destroyed in some areas and did not provide a welded joint by the method of exploding wires. There was settled a phenomenon of energy conversion of the intracrystalline chemical bond between the material and the complex, which included a point defects and impurity atoms.