Influence of inert particles on the dynamics of controlled synthesis of a composite in cylindrical reactor with thick walls

Natalia Bukrina, Anna Knyazeva

Research output: Contribution to journalReview articlepeer-review

4 Citations (Scopus)

Abstract

The paper proposes the model of high-temperature synthesis of a composite from pure elements with the addition of inert particles. The model accounts for the heating of the reactor walls by thermal radiation from a device which temperature can vary with different rate. The chemical reactions are summarized by a scheme that corresponds to the synthesis of Ni3Al intermetallic from the stoichiometric mixture of 3Ni+Al powder. The kinetic law accounts for the reaction retardation by the layer of the synthesized product. The effective thermophysical properties of the mixture in the reactor depend on the properties of components, the volumetric fraction of inert particles and the conversion degree. Besides, the model accounts for the melting of fusible component (via the change in heat capacity) and dependence of the properties of the powder compact on the porosity. The work demonstrates examples of the numerical study of the model for two variants of particle distribution in the compact. It elucidates that the inhomogeneous distribution of inert particles has only slight effect on the heat-up dynamics; however, their presence in the powder mixture appreciably influences the synthesis dynamics. The implementation of particles of various-types shows close regularities. High temperatures enable the fusible reagent melting, so the synthesis primarily occurs with participation of the liquid phase and with the formation of a refractory product. The impact of the heating rate is ambiguous. On the one hand, it accelerates the reactions. On the other hand, it promotes nonuniform heating leading to a nonuniform composition.

Original languageEnglish
Article number119553
JournalInternational Journal of Heat and Mass Transfer
Volume152
DOIs
Publication statusPublished - May 2020
Externally publishedYes

Keywords

  • Effective thermophysical properties
  • High-temperature synthesis
  • Inert particles
  • Intermetallic
  • Mathematical modeling

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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