HVOF-3000 supersonic flame spray equipment;
In the High Velocity Oxy-Fuel (HVOF) process, powder is introduced
axially into a chamber in which a gas flame is constantly burning
under high pressure. The exhaust gas exits through an expansion
nozzle which produces a high velocity gas stream. The powder
particles are heated in this gas stream and transferred by it with
kinetic energy to the surface of the work piece, forming a dense
coating with excellent bonding properties.
Due to the moderate transfer of heat to the powder particles and to
the work piece, which remains relatively cool, there is little
metallurgical change to either the sprayed material or work piece.
Benefits of HVOF are:
Very Dense Coatings
Minimal Metallurgical Changes
Minimal Temperature Effects
HVOF-3000 consists of :
Spray gun, powder feeding machine, control system, heat-exchanger
system and pipeline system. Please refer to related photos as
It’s a compact equipment with the traits of easy-operating, stable
working performance, low fuel consumption and high-quality coating
Process combusts oxygen and propane gas(C3H8),, easy to operate
with high production, operate steady and safety , dense , low
porosity coatings…The mixture gas of oxygen and fuel gas is sent to
the burning area of spray gun exit under high pressure. Then the
burning gas is accelerated to form a supersonic flame with the help
of peripheral compressed air. The spray powder is sent into burning
flame and make a functional coating.
How to work:
The HVOF is fueled by propylene/ propane gas(C3H8)
&oxygen with compressed air softening the particles that
are carried by nitrogen onto the surface being sprayed. The gun
features a combustion chamber that actually expands the products
going through a small orifice in the gun at high velocities
producing "shock diamonds" exiting the nozzle. Gas velocities have
been reported exceeding Mach 1 using this process. HVOF coating are
very dense and produce an extremely high tensile bond strength.
uses this process on steel mill roll bodies, piston rods,
internal pump surfaces, and as a replacement to chrome plating
,steel structure , multi-functional coating ,even more can use for
MDPE/HDPE and various plastic coating .
Some parameters of HVOF -3000 spray gun:
Powder feeder's parameters of HVOF -3000 spray equipment
Spray gun with manual and machine fixed way of operation. Gas
needed: oxygen and propane (C3H8), weight: 2kg. velocity of spray
particles: ≥450m/s. It can work a long time stably.
Powder feeding machine :
Used to store spray powder and send them to burning flames
according to technological requirements. The feeding gas is
nitrogen, which pulverizes the powder and sends the pulverized
particles along with the gas to spray gun. Can regulate the feeding
velocity by the localizer on the regulating control panel.
Powder feeder's parameters of HVOF -3000 spray equipment
Here are several coatings offered and their general properties:
(WC) Tungsten Carbide- based coating: Excellent wear resistance
(abrasion, erosion, cavitation, friction, etc.) at low temperature
<500oC and very good resistance to corrosion/oxidation.
Grindable, not-machinable. Surface finish after grinding as high as
(CrC) Chromium Carbide-based coating: Excellent wear resistance
(abrasion, erosion, cavitation, friction, etc.) at high temperature
up to 870oC and excellent resistance to hot
corrosion/oxidation. Grindable, not machinable. Surface finish
after grinding as high as 4RMS.
(T800, Stellite) - Co based coating: Very good resistance to wear
and corrosion/oxidation. Produces a hard and dense coating, low
coefficient of friction. Operating temperature up to 800oC.
Machinable and grindable.
(SS/Fe) Iron-based coating: Good for rebuilding, good resistance to
wear and corrosion. Machinable and grindable.
(Ni-Al; Ni- Cr,Ni-Cu) Nickel-based coating: Good for rebuilding,
good resistance to wear and corrosion up to 900 C. Machinable and
PE plastic and ceramic based coating……
UNS N05500 /Other common names: Alloy K500
Monel K500 is a precipitation-hardenable nickel-copper alloy that
combines the excellent corrosion resistance characteristic of Monel
400 with the added advantage of greater strength and hardness.
These amplified properties, strength and hardness, are obtained by
adding aluminum and titanium to the nickel-copper base and by a
thermal processing used to effect precipitation, typically called
age hardening or aging. When in the age-hardened condition, Monel
K-500 has a greater tendency toward stress-corrosion cracking in
some environments than Monel 400. Alloy K-500 has approximately
three times the yield strength and double the tensile strength when
compared with alloy 400. Plus, it can be further strengthened by
cold working prior to precipitation hardening. The strength of this
nickel steel alloy is maintained to 1200° F but stays ductile and
tough down to temperatures of 400° F. Its melting range is
This nickel alloy is spark resistant and non-magnetic to -200° F.
However, it is possible to develop a magnetic layer on the surface
of the material during processing. Aluminum and copper may be
selectively oxidized during heating, leaving a magnetic nickel rich
film on the outside. Pickling or bright dipping in acid can remove
this magnetic film and restore the non-magnetic properties
nickel alloy K-500 has a greater tendency toward stress-corrosion
cracking in some environments. Monel K-500 has been found to be
resistant to a sour-gas environment. The combination of very low
corrosion rates in high-velocity sear water and high strength make
alloy K-500 particularly suitable for shafts of centrifugal pumps
in marine service. In stagnant or slow-moving sea water, fouling
may occur followed by pitting but this pitting slows down after a
fairly rapid initial attack.
What are the characteristics of Monel K500 coatings
Corrosion resistance in an extensive range of marine and chemical
environments. From pure water to non-oxidizing mineral acids, salts
Excellent resistance to high velocity sea water
Resistant to a sour-gas environment
Excellent mechanical properties from sub-zero temperatures up to
In what applications is Monel K-500 coatings used?
Sour-gas service applications
Oil and gas production safety lifts and valves
Oil-well tools and instruments like drill collars
Oil well industry
Doctor blades and scrapers
Chains, cables, springs, valve trim, fasteners for marine service
Pump shafts and impellers in marine service
Steel industry and steel alloy hardware……
Various derivatives are available. For more technical information,
you can communicate with us. Our team of engineers will be happy to
answer to your questions