• Thermal Spray / HVOF Powders Synonyms:

HVOF thermal spray powder, HVOF coatings, plasma spray powder, thermal spray powder, flame spraying, high velocity oxygen fuel spraying, cold spraying, detonation spraying, thermal spray coatings, flame spray coatings, carbide coatings. ceramic coatings, tungsten carbide HVOF powders, chromium carbide HVOF powders, gas atomized stellite® cobalt based HVOF powders, gas atomized nickel based HVOF powders, atomized iron based HVOF powders, Pure Molybdenum powders, Pure Aluminum powders, Pure Copper powders, Pure Nickel powders, Pure Tungsten powders, Stainless steel powders, Aluminum Bronze powders, Tin Based Babbitt powders, Silicon Aluminum powders, Cobalt Chromium Moly powders, Low Carbon Steel powders, Chrome Carbide powders, Tungsten Carbide Fine powders, Tungsten Carbide Coarse powders, Tungsten Carbide High Hardness powders, Tungsten Carbide-Cr Carbide powders, Aluminum Oxide (alumina) powders, Aluminum Oxide-Titanium Dioxide powders, Titanium Dioxide powders, Chromium Oxide powders, Zirconium Oxide powders, Yttria-Zirconium Oxide powders, Magnesium Zirconate powders, Magnesia-Alumina Spinel powders, High Carbon Iron-Molybdenum Composite powders, Nickel-Chrome powders, Pre-Alloyed Nickel-Aluminum powders, Nickel-Aluminum-Molybdenum powders, Cobalt-Chromium-Molybdenum powders, Aluminum Silicon Polyester powders, Aluminum Bronze Polyester powders, Alumina Titania, Alumina Titania, Aluminum Oxide, Magnesium Aluminate (Spinel), Magnesium Aluminate (Spinel) Spherical, Aluminum Oxide, Ultra Pure Alumina Spherical, Low Silica ZrO2, Magnesium Zirconate, Zirconium Oxide (Calcia), Zirconium Oxide (Yttria), Alumina-Zirconia, Chromium Oxide, Chromium Oxide - Silica, Chromium Oxide - Titania, Chromium Oxide - Silica- Titania, Auminate titanate. Mullite, 

• Thermal Spray / HVOF Powders General Description:

1) Thermal spraying techniques are coating processes in which melted (or heated) materials are sprayed onto a surface. The "feedstock" (coating precursor) is heated by electrical (plasma or arc) or chemical means (combustion flame).

2) Thermal spraying can provide thick coatings (approx. thickness range is 20 micrometers to several mm, depending on the process and feedstock), over a large area at high deposition rate as compared to other coating processes such as electroplating, physical and chemical vapor deposition. Coating materials available for thermal spraying include metals, alloys, ceramics, plastics and composites. They are fed in powder or wire form, heated to a molten or semimolten state and accelerated towards substrates in the form of micrometer-size particles. Combustion or electrical arc discharge is usually used as the source of energy for thermal spraying. Resulting coatings are made by the accumulation of numerous sprayed particles. The surface may not heat up significantly, allowing the coating of flammable substances.

3) Coating quality is usually assessed by measuring its porosity, oxide content, macro and microhardness, bond strength and surface roughness. Generally, the coating quality increases with increasing particle velocities.

4) Several variations of thermal spraying are distinguished:

a) Cold spraying

b) Detonation spraying

c) Flame spraying

d) High-velocity oxy-fuel coating spraying (HVOF)

e) Plasma spraying

f) Warm spraying

g) Wire arc spraying

h) In classical (developed between 1910 and 1920) but still widely used processes such as flame spraying and wire arc spraying, the particle velocities are generally low (< 150 m/s), and raw materials must be molten to be deposited. Plasma spraying, developed in the 1970s, uses a high-temperature plasma jet generated by arc discharge with typical temperatures >15000 K, which makes it possible to spray refractory materials such as oxides, molybdenum, etc. 

• Plasma Spray General Description:

1) In plasma spraying process, the material to be deposited (feedstock) — typically as a powder, sometimes as a liquid, suspension or wire — is introduced into the plasma jet, emanating from a plasma torch. In the jet, where the temperature is on the order of 10,000 K, the material is melted and propelled towards a substrate. There, the molten droplets flatten, rapidly solidify and form a deposit. Commonly, the deposits remain adherent to the substrate as coatings; free-standing parts can also be produced by removing the substrate.

2) There are a large number of technological parameters that influence the interaction of the particles with the plasma jet and the substrate and therefore the deposit properties. These parameters include feedstock type, plasma gas composition and flow rate, energy input, torch offset distance, substrate cooling, etc. 

• Thermal Spray / HVOF Powder Chemical Compounds Available From READE:

1) Aluminum and aluminum base alloys
2) Cobalt and cobalt base alloys
3) Copper and copper base alloys
4) Iron and iron base alloys
5) Molybdenum and molybdenum base alloys
6) Nickel and nickel base alloys
7) Tungsten metal
8) Iron based superalloys
9) Nickel based superalloys
10) Co-Cr-Al-Y alloys
11) Fe-Cr-Al-Y alloys
12) Ni-Cr-Al-Y alloys
13) Exothermic, self-bonding: Composite powders
14) Abradable-clearance control: Composite powders
15) Abradable-clearance control: Aluminum polyester blend
16) Aluminum oxides
17) Chromium oxides
18) Zirconium oxides, stabilized
19) Chromium carbides
20) Tungsten carbide plus cobalt- 93WC/ 7Co
21) Tungsten carbide plus cobalt- 88WC/ 12Co
22) Tungsten carbide cobalt- 83WC/ 17Co
23) Tungsten carbide plus cobalt- 80WC/ 20Co
24) Tungsten carbide plus nickel- WC/ Ni
25) Tungsten carbide/ cobalt/ chromium-WC10Co4Cr
26) Tungsten carbide/ nickel aluminum blend
27) Tungsten carbide/ chromium/ carbon/ nickel-WC/ Cr/ C/ Ni
28) HVOF carbide powders
29) HVOF M-Cr-Al-Y powders
30) HVOF metal alloy powders
31) Laser cladding powders
32) Self-fluxing powders
33) Self-fluxing/Carbide blend powders
 

• Thermal Spray / HVOF Powders Typical Granulations Available From READE:

100/ 325 mesh, 120/ 325 mesh, 140/ 325 mesh, 170/ 325 mesh, 200 mesh/ 30 microns, 200/ 325 mesh, 270 mesh/ 5 microns, 325 mesh / 5 microns, and 325 mesh/ 10 microns  

• Thermal Spray / HVOF Powders Typical General Applications:

Thermal barriers, wear resistance, corrosion resistance, high dielectric strength, hard dense coating, low wettability, decorative arts, nonskid surfacing, and shock resistance  

• Thermal Spray / HVOF Powders Packaging Options:

Jars, drums and to customer specification  

• Thermal Spray / HVOF Powders TSCA (SARA Title III) Status:

Varies. For further information please call the U.S. Environmental Protection Agency at +1.202.554.1404  

• Dust And Fumes Safety Notice:

1) The atomization of molten materials produces a certain amount of dust and fumes. Proper extraction facilities are vital, not only for personal safety, but to minimize entrapment of re-frozen particles in the sprayed coatings. The use of breathing masks, fitted with suitable filters, is strongly recommended, where equipment cannot be isolated. Certain materials offer specific known hazards:

2) Finely divided metal particles are potentially pyrophoric and none should be allowed to accumulate.

3) Certain materials e.g. aluminum, zinc and other base metals may react with water to evolve hydrogen. This is potentially explosive and special precautions are necessary in fume extraction equipment.

4) Fumes of certain materials, notably zinc and copper alloys are unpleasant to smell, and, in certain individuals, may cause a fever-type reaction. This may occur some time after spraying and usually subsides rapidly. If it does not, medical advice must be sought. Source: Wikipedia