Abstract
The major advantages of gas-thermal spraying techniques are: wide range of spraying materials and chemical compounds, high efficiency, scope for restoring outworn costly parts and units with simultaneous increase of their life, scope for use in any area of machine building regardless of the production series, etc. Spraying techniques involving use of energy of plasma jets (plasma spraying) and shock waves generated by explosive combustion of a mixture of oxygen and acetylene (detonation spraying) were developed for reducing coat porosity and increasing bonding strength. Use of sprayed coats is also promising in the manufacture of fittings for ordinary and corrosion-resistant valves. Spraying of packing surfaces of pipes in valve housings, disks, and spindles makes it possible to increase wear resistance of friction couplings, to reduce difficulty of valve making, and to increase their operational reliability.
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