Descripción del producto
HVOF****0 supersonic flame spray equipment;
Working principal
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
Excellent Bonding
Minimal Metallurgical Changes
Minimal Temperature Effects
Additional Information:
HVOF****0 consists of :
Spray gun, powder feeding machine, control system, heat-exchanger
system and pipeline system. Please refer to related photos as
attached .
Feature :
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 ****0 spray gun:
Powder feeder's parameters of HVOF ****0 spray equipment
Spray gun with manual and machine fixed way of operation. Gas
needed: oxygen and propane (C3H8), weight: 2kg. velocity of spray
particles: ≥**0m/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 ****0 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 <**0oC and very good resistance to
corrosion/oxidation. Grindable, not-machinable. Surface finish
after grinding as high as 4RMS
(CrC) Chromium Carbide-based coating: Excellent wear resistance
(abrasion, erosion, cavitation, friction, etc.) at high
temperature up to **0oC and excellent resistance to hot
corrosion/oxidation. Grindable, not machinable. Surface finish
after grinding as high as 4RMS.
(T**0, 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 **0oC.
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 **0 C. Machinable and
grindable.
PE plastic and ceramic based coating……
MonelK****-based coating:
UNS N****0 /Other common names: Alloy K**0
Monel K**0 is a precipitation-hardenable nickel-copper alloy that
combines the excellent corrosion resistance characteristic of
Monel **0 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***0 has a greater tendency toward
stress-corrosion cracking in some environments than Monel **0.
Alloy K***0 has approximately three times the yield strength and
double the tensile strength when compared with alloy **0. Plus,
it can be further strengthened by cold working prior to
precipitation hardening. The strength of this nickel steel alloy
is maintained to ***0° F but stays ductile and tough down to
temperatures of **0° F. Its melting range is ********0° F.
This nickel alloy is spark resistant and non-magnetic to ***0° 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***0 has a greater tendency toward stress-corrosion
cracking in some environments. Monel K***0 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***0 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 K**0 coatings
Corrosion resistance in an extensive range of marine and chemical
environments. From pure water to non-oxidizing mineral acids,
salts and alkalis.
Excellent resistance to high velocity sea water
Resistant to a sour-gas environment
Excellent mechanical properties from sub-zero temperatures up to
about **0C
Non-magnetic alloy
In what applications is Monel K***0 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
País: |
China |
N º de Modelo: |
High Velocity Oxy-Fuel (HVOF) 3000
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