SURFACE ENGINEERING
Surface engineering is a multidisciplinary activity intended to tailor the properties of the surface of engineering components so that their function and servicebility can be improved. The ASM handbook defines surface engineering as "treatment of the surface and near-surface regions of a material to allow the surface to perform functions that are distinct from those functions demanded from the bulk of the material"
(Joseph R. Davis ,Surface engineering for corrosion and wear resistance, 2001, p. 1)
DETONATION SPRAYING
In detonation spraying an explosive mixture of fuel, oxygen and powder is introduced into a long tube/barrel and ignited by a spark plug. The resulting detonation pressure wave heats and accelerates the entrained powder particles, which travel down the water cooled barrel toward the substrate. Nitrogen is used to purge the barrel, between detonations. The cycle of purging, injection and detonation is repeated at a frequency of 3 to 6 Hz. Detonation spray processes are hotter and yield longer particle dwell times than concentional flame spray.
(Joseph R. Davis, Handbook of thermal spray technology, 2004, p.56)
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