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The most popular family of gas fueled HVOF spray guns worldwide, coatings applied using a DiamondJet™ spray gun are of very high quality and suitable for some of the toughest coating applications. Moreover, DiamondJet offers a lot of flexibility – customers can choose from a wide range of fuel gases, a choice of water or air cooled air caps and a choice of machine-mounted and hand-held gun versions.

DiamondJet™ Series

The DiamondJet family of spray guns for HVOF has been developed to produce high integrity coatings of metals, alloys, superalloys and carbides. Coatings sprayed with a DiamondJet gun exhibit high density, low oxide ­content, superior microhardness and high adhesion with ­excellent machinability.

DiamondJet guns can be supplied with a water-cooled front section, which allow the gun to produce higher particle velocities, maximizing coating substrate and interparticle bonding. In general, water-cooled DiamondJet guns also have higher coating densities, higher hardness and lower ­oxide content. For mission critical applications and applications where service life must be maximized, the use of the water-cooled DiamondJet gun is strongly recommended.

General Description

The DiamondJet process uses oxygen, fuel gas and air to produce a high pressure annular flame, which provides uniform heating of the axially introduced powder spray material. The gas stream is accelerated through a converging/diverging nozzle to supersonic speeds. The gas stream propels the powder particles towards the substrate. Individual particles deform plastically upon impact, tenaciously bonding the coating to the substrate. These coatings are very dense, with low porosity, predictable chemistries and fine, homogeneous microstructures. The axial powder injection focuses the coating material within the center of the flame, eliminating coating material buildup on the walls of the extended air cap and minimizing wear.

DiamondJet guns offer efficient operation, using less process gas compared to other HVOF spray guns. The standard, water-cooled guns consume minimal quantities of water, with only potable (drinking water) quality required at line ­pressures as low as 2.76 bar (40 psi). Material spray rates, depending on gun configuration and material applied, can be as high as 150 g/min (20 lb/h), thus reducing spray times.

The DiamondJet series supports a wide range of fuel gasses and water or air cooling options.

The coatings produced feature:

  • High density
  • Low oxide content
  • High adhesion to substrate
  • Excellent machinability
Key characteristics
  • Choice of configuration
  • Modular hardware that is simple to remove and replace
  • Low process gas consumption
  • Choice of machine-mount and handheld models
Process media Hydrogen, Methane, Ethylene, Propylene, Propane, Oxygen, Nitrogen (Carrier Gas)
Weight From 1.7 kg (3.7 lb) up to 4.1 kg (9 lb) depending on gun model
Controller compatibility Machine-mount: MultiCoat™, UniCoat™-GF, UniCoat™-GLF, DJC, DJCEH
Handheld: DJF with DJFEW
Extension DJT


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