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Porosity formation phenomena in glass particles atomised by oxyacetylene flame-spraying: Effect of feedstock powders and atomisation conditions by O. Rojas; R. Muñoz; J.D. Holguín; M.E. López; H. Ageorges; F. Vargas is a Materials Science article available to read on EtoBox.

What is Porosity formation phenomena in glass particles atomised by oxyacetylene flame-spraying: Effect of feedstock powders and atomisation conditions about?

Flame spraying is an interesting technique, with a high yield, for porous particle manufacturing. However, a better understanding of porosity formation phenomena in atomised particles is required to improve porosity control. Hence, five chemical systems of synthesised feedstocks were atomised in an oxyacetylene flame to evaluate the effects of chemical composition, glassy phase, and particle size of the feedstock powder, as well as flame enthalpy and atomisation distance, on porosity formation. The findings showed that the amount of volatilisable chemical species during the atomisation process is essential in gas bubble formation, whose kinetics of nucleation, growth, and migration phenomena are affected by the glassy phase and the Na2O/CaO mass ratio in the feedstock powder. The thermal energy input per in-flight particle mass unit also impacts on the kinetics of these phenomena and thus on the retained porosity. Particle size, oxyfuel flame enthalpy, and atomisation distance must be matched to improve porosity retention.

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Author

O. Rojas; R. Muñoz; J.D. Holguín; M.E. López; H. Ageorges; F. Vargas

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)