Abstract
In this review, the beginnings and evolution of the cold gas spray (CGS)
technique are described, followed by the main fundamental aspects of the
technique together with a description of the several spraying systems up to
date. Sequentially, the main spray parameters and their influence on the
properties of the coatings are reported. Afterwards, the most important
methodologies for preparing the feedstock powders to be sprayed, the effect
of the powder composition, microstructure, particle size and shape on the
properties of the coatings are discussed. The nature of the spray gun and
nozzle, and the substrate pre-treatments were also discussed. With regard to
microstructure and properties, the chemical and physical characterization of
the coatings and the performance in protecting the substrates against
corrosion together with some mechanical properties are presented and
compared. The lacking systematic studies about the great part of
investigated systems is the main drawback to compare the published results.
Closing this review, the main applications, and the potentialities of the
CGS coatings are evidenced.
Cited by
27 articles.
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