Abstract
Discrete (discontinuous) mechanochemical synthesis of titanium nitride was experimentally investigated. The experimental results show that mechanical activation intensifies the chemical conversion in the Ti-N system, and the discrete synthesis of the final product is conducted under “soft” controlled conditions without high heat release. The new theory of mechanochemical synthesis and the mathematical model based on it were used for theoretical evaluation of the dynamics of titanium activation in the nitrogen medium. It was found that the discrete mode of synthesis includes two factors accelerating mechanochemical reactions in the Ti-N synthesis: structural (grinding of metallic reagent and formation of interfacial areas) and kinetic (accumulation of excess energy stored in the formed structural defects in metallic reagent). The kinetic constants of the process were found using experimental data and the inverse problem method. The diagrams defining the controlled modes of obtaining titanium nitride particles with the given characteristics were constructed. A mathematical model for theoretical estimation of the dynamics of activation of titanium powder in the nitrogen medium was developed using a new macrokinetic theory of mechanochemical synthesis.
Highlights
Mechanochemical synthesis of inorganic substances is widely used to stimulate various solid-phase reactions and is a promising method to obtain superfine powders containing significant amounts of gaseous components
Synthesis stimulated by mechanical action has been the subject of numerous studies [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
Mechanochemical synthesis can be classified as one-stage and two-stage e.g., [15,16,17,18,19,20,21,22,23]
Summary
Mechanochemical synthesis of inorganic substances is widely used to stimulate various solid-phase reactions and is a promising method to obtain superfine powders containing significant amounts of gaseous components. Mechanochemical synthesis can be classified as one-stage and two-stage e.g., [15,16,17,18,19,20,21,22,23]. One-stage mechanochemical synthesis is usually conducted in a high-energy mill in which reactive particles are milled and activated. In the case of two-stage mechanochemical synthesis, the first stage mainly involves the grinding and mechanical activation of powder mixtures, while the second stage (outside the mechanical activator) involves synthesis. The synthesis of a mechanically pre-activated mixture was characterized by the high rates of chemical reactions
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