Heat-release kinetics in high-temperature nitriding of zirconium wires

Kinetics of Heterogeneous Self-Propagating High-Temperature Reactions

“…Such parameters are essentially impossible to achieve using conventional approaches for measurement of kinetics parameters. While standard nonisothermal TGA/DTA-based approaches [6] are still used to evaluate the kinetics of SHS reactions, several unique methods such as electrothermal explosion (ETE) [7] and electrothermography (ET) [8] were specifically developed to fit the experimental conditions of SHS reactions. Moreover, recently a variety of advanced in situ diagnostics, including time-resolved X-ray diffraction (TRXRD) [9], high-speed X-ray phasecontrast imaging [10], and high speed transmission electron microscopy (HSTEM) [11] were modified to obtain the kinetics of phase transformations during SHS reactions.…”

“…Electrothermography is a technique that utilizes metal wires in either a gaseous or clad environment [8]. The wire is resistively heated rapidly to the desired temperature, with the electric power being adjusted to compensate for the heat release due to the chemical reaction.…”

“…Because of this, a number of experiments were conducted in nitrogen environments. In specific, the Ta/N [94], Ti/N [95][96][97][98], Nb/N [98,99], and Zr/N [8] systems have been studies. However, the technique has also be used to study carbides, including the Ti/C [100], Zr/C [100], W/C [101], Nb/C [102], along with other systems, including Mo/ Si [103][104][105][106], W/Si [107,108], Ni/Al [109], and Ni/Ti [109].…”

Combustion and explosion processes in physical chemistry and technology of inorganic materials

“…The method in question represents electrothermography for kinetic studies. 79,80 The principle of the method is simple and well-known. A system of two reactants, viz., a thin filament made of the tested metal and a gas, is considered.…”

“…The metal filament is heated by electric current and thus plays the role of a reactant and a high temperature source. The advantage of this method 79,80 is that it employs an optical or electrical monitoring system and heat evolution compensation for maintaining the constant temperature of the filament by attenuation of the electrical power. This procedure allows recording time dependences of heat evolution rates at different constant temperatures.…”