Material Coating By The Detonation Gun Process

Abstract

There are numerous methods available to repair compressor and turbine shafts when bearing journals, seal surfaces and other critical areas require resurfacing. One of these methods is by the use of detonating gun coatings. The detonation gun is a device that can deposit a variety of metallic and ceramic coating materials at supersonic velocities onto a work piece by controlled detonation of oxygen-acetylene gas mixtures. Coatings applied by this method are characterized by high bond strength, low porosity and high modulus of rupture. This paper describes the equipment used to apply D-Gun coatings and provides data on coating thicknesses used, surface finishes available and physical properties of some popular D-Gun coatings used in machinery repair. Examples are cited showing increasing in operating life that can be achieved on various pieces of equipment by properly selected and applied coatings.