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Thermal Spray is an industrial coating process consisting of:

  • heat source – oxyfuel gas flame, electric arc, plasma, laser beam
  • material feedstock – in powder or wire form
  • propellant – compressed air, inert gases, chemical combustion

All thermal spray processes need two types of energy to produce a spray deposit

  • thermal energy – process dependent, used to heat the spray material to its plastic or molten state
  • kinetic energy – to accelerate the particle to the substrate, mainly responsible for the coating deposit density, the cohesion and adhesion between the coating and the substrate