الوصف
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
بلد: |
China |
نموذج رقم: |
High Velocity Oxy-Fuel (HVOF) 3000
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سعر فوب: |
(قابل للتفاوض)
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