Overview 

Cold Spray is a material-deposition process whereby particles of diameters between 1 and 40 microns in diameter are impacted at high velocity onto a substrate. The particles are placed in a gas stream of nitrogen, helium or air. The stream is then heated and accelerated through a de Laval supersonic nozzle at speeds ranging from 1000 to 2500 meters per second. The particle stream is directed towards a substrate, where the particles are consolidated in the solid state.

 

Cold Spray Advantages

 

Cold Spray offers several advantages over other coating systems and deposition processes. Being a low-temperature process, Cold Spray operates below the melting point of metals, requires no combustible fuels or gases, and results in very low porosity deposits. Its solid-state bonding feature, similar to explosive bonding, allows mechanical mixing of particles and substrate. High velocity impact results in plastic deformation of particles to disrupt oxide films, and provides compressive residual stresses. Cold Spray can also be used to form high-density deposits, producing thick coatings of low oxide and porosity content and/or free-standing structures.

 

Low Temperature Process

  • Below melting point of metals

  • No combustion fuels, gas

 

Solid State Bonding

  • Mechanical mixing of particles and substrate

  • Similar to explosive bonding

  • Plastic deformation of particles disrupt oxide films

High Density Deposits

Form thick coatings at high deposition rates
Low oxide and porosity content (<1%)
Form free-standing structures
Compressice residual stresses

 

Cold Spray Applications

Gearbox CS Repaired