HVAF: High Velocity Air-Fuel

Technology Resource

This guide is a collection of information and documents related to the HVAF thermal spray process.

HVAF vs HVOF Comparison

HVOF guns (JP5000, Diamond Jet) are compared to HVAF (M3 by Uniquecoat Technologies).

Cost Comparison: JP5000, Diamond Jet, M3

Gun	JP5000 (HVOF)	Diamond Jet (HVOF)	M3 (HVAF)
Particle velocity, m/sec	600-700		>1,000
Fuel	Kerosene	Hydrogen	Propane, propylene, or natural gas
Kerosene consumption, L/hr	30	-	-
Air Consumption, m3/hr	-	22.26	430
Oxygen consumption, m3/hr	60	13.85	-
Propane consumption, kg/hr	-		28.8
Hydrogen consumption, m3/hr	-	41.06	-
Type of cooling	water	air/water	air
Spray rate (hard facing alloys), kg/hr	7	5.4	23
Spray rate (WC-based), kg/hr	9	4.2	28
*Cost of spraying of 1 kg of WC-based powder (fuel and oxidizer only), USD**	$10.40 (liquefied) $15.56 (bottled)	$40.60 (liquefied) $43.10 (bottled)	$2.75
*Cost of spraying of 1 kg of metal powder (fuel and oxidizer only), USD**	$13.40 (liquefied) $20.00 (bottled)	$31.70 (liquefied) $33.70 (bottled)	$3.35

Kerosene price - $4/gallon, oxygen price - $1/m3 (liquefied), $1.76 (bottled). Delivery cost not included. Hydrogen price - $251.42/12 pack cradle

Relative Decarburization (WC-based Coatings): Diamond Jet, M3

Gun	M3 (HVAF)	DJ (HVOF)
Relative Decarburization	13%	54%

Abrasion Resistance: JP-5000 (HVOF), M2 (HVAF), M3 (HVAF)

* Tests performed by H.C.Starck

Corrision Resistance

HVAF coatings can be corrision resistant "as sprayed" with no additional sealant application.

Coating Morphology

Coating morphology.