ABSTRACT
This paper is devoted to recent accomplishments in basic and applied research on
gaseous detonation guns for thermal spraying. The conditions of processing powder
materials are governed by the thermal, velocity, and chemical relaxation of particles in a
high-temperature two-phase pulsed stream generated at every working cycle of the
gaseous detonation guns (GDG). The relaxation of particles is conditioned by the
parameters of the entire system under consideration and depends not only on the
energy of a single pulse and the parameters of the high-temperature gaseous medium,
but also on the spatial arrangement of a fresh gas charge and a single dose (metered
amount) of powder. The classification and design concepts of detonation guns are
discussed. The possible versions of D-guns operation cycle are described. The better
understandings of knowledge of the involved phenomena are necessary for
improvement of the design of gaseous detonations guns.