TAFA Model 5220 HP/HVOF Gun
The TAFA Model 5220 is a kerosene-fueled HP/HVOF gun that is used to achieve extremely high coating densities. The unique design of this gun allows it to produce particle velocities of 3,300 to 3,900 fps, which is significantly higher than any other gaseous-fueled HVOF device on the market today.
Model 5220 features:
- Efficient combustion and particle heating
- Converging/diverging nozzle at combustion chamber exit produces supersonic gas velocity
- Efficient gun cooling
- Multiple gun configurations with multiple barrel lengths
- Radial, low-pressure powder injection after combustion chamber
- Superior coating integrity and uniformity
- Thick coating capability
- Less sensitive to powder particle size than other HVOF systems
- Longer, less-sensitive thermal spray distance
TAFA Model 8200 HP/HVOF Gun
The TAFA Model 8200 is a kerosene-fueled HP/HVOF gun that is used to achieve extremely high coating densities. More efficient than the Model 5220 Standard Gun, it offers the same outstanding coating characteristics but at dramatic operating cost savings—increasing powder deposit efficiency and feed rate while reducing fuel and oxygen consumption. The 8200 gun’s advanced design adds the ability to spray fine carbide particle sized powders that produce enhanced denser and harder coatings with smoother as-sprayed surface finishes requiring less finishing. These coatings have improved wear resistance, improved impermeability for better corrosion protection, and can be applied as thinner “flash” coatings in some applications to reduce powder consumption. TAFA Model 825 JPid HP/HVOF Inside Diameter (ID) Gun
The TAFA Model 825 JPid is a kerosene-fueled HP/HVOF gun that achieves quality carbide coatings on inside diameters as small as 8” /203 mm. The model is ideal for spraying HP/HVOF-quality coatings on cylinder bores, pump housings, tight confines of Francise turbine vanes and more.TAFA Model 7700GF Gaseous-Fueled HVOF System
The Model 7700GF system is a cost-effective, efficient and safe way to produce high-quality gaseous-fueled HVOF coatings. The system uses closed-loop adjustment and control of spray parameters to reduce operating costs. It features a user-friendly operator interface and recipe storage to keep operation simple and repeatable. And its intelligent design separates the flammable fuel gas circuit and includes a powder feed circuit that inhibits combustion gas back flow up the powder feed line, making this system one of the safest gaseous-fuel HVOF controllers on the market.TAFA Model 7780 Universal Process Control Center (UPCC)
The Model 7780 UPCC is a multi-process control system that can monitor and control multiple spray processes such as single-cathode air plasma spray (APS), HE plasma, PlazJet II, GF-HVOF, LF-HVOF and combustion powder. It uses a modular software and hardware design for flexible configurations and easy upgrades. And the integrated programs include real-time feedback of key process variables, system diagnostics, process data acquisition and statistical analysis.TAFA Model JP-8000 HP/HVOF® System
With the Model JP-8000™ system, you’ll get advanced features including PLC-based closed-loop mass flow controls, an intuitive touchscreen and constant process monitoring. The system is designed for maximum safety and easy maintenance with a modular drawer configuration and separated gas and electrical circuits. It can use the proven Model 5220, 8200 and 825 JPid liquid-fueled guns.TAFA Model JP-5000® HP/HVOF® System
Our original liquid-fueled HP/HVOF system, the Model JP-5000 system remains unparalleled in coating consistency and reproducibility. It features a semi-automatic rotometer-controlled console that controls all operating parameters including cooling water, powder, carrier gas, oxygen and fuel flows. What is the Thermal Spray HVOF process?
High Velocity Oxygen Fuel (HVOF) coating is a thermal spray process in which a fuel and oxygen are mixed, fed into a combustion chamber, and ignited. The gas produced in the combustion chamber has an extremely high temperature and pressure and is ejected through a nozzle at supersonic speeds. Powder is injected into the high velocity gas stream and propelled at the substrate to be coated. The result is a coating that has a low porosity and a high bond strength to the substrate material, which provides it with wear and / or corrosion resistance.
In the HVOF spraying process, the high velocity of the particles produces kinetic energy, which is more important than the temperature. One of the benefits of the HVOF spraying process is that extremely dense and hard coatings can be produced at relatively low temperatures.
HVOF Spraying Materials
In order to achieve optimal coating and an extension of equipment life, a variety of materials can be used for the spraying process. Some commonly used materials include:
- Tungsten Carbide: HVOF Tungsten Carbide coatings are extremely dense, well bonded and can be applied to a high thickness. HVOF Tungsten Carbide materials are recommended for applications that are subject to wear.
- Tungsten Carbide-Cobalt-Chrome: HVOF Tungsten Carbide-Cobalt-Chrome coatings are more wear resistant in most applications than Tungsten Carbide coatings and are more corrosion resistant because of the Chromium content. HVOF Tungsten Carbide-Cobalt-Chrome is recommended for applications with abrasive or sliding wear and are exposed to some corrosion. HVOF Tungsten Carbide-Cobalt-Chrome coatings are an excellent alternative to hard chromium plating.
- Tungsten Carbide-Nickel Superalloy: Spraying a material with HVOF Tungsten Carbide-Nickel Superalloy produces a well bonded coating with a high level of wear resistance to abrasive grains, hard surfaces, and fretting. These coatings are ideal for hydraulic rods, ball valves, drilling, and saltwater applications.
- Chromium Carbide: HVOF Chromium Carbide coatings have high microhardness and are well bonded. These coatings are ideal for providing resistance to solid particle erosion, abrasion, and tribocorrosion at elevated temperatures.
- Stainless Steel: Spraying a material with HVOF Stainless Steel produces a dense and well bonded lower cost coating. These coatings are used for protection against corrosion, cavitation, and low temperature particle erosion in salvage and repair applications.
Benefits of the HVOF process
HVOF coatings are perfect for protecting parts that are susceptible to damage from wear and corrosion. Spraying aircraft landing gear with HVOF coatings is a prime example of how this process can be used. The landing gear hydraulic cylinder is subjected to a high amount of tensile stress from flexing and sliding wear as the hydraulic cylinder retracts to absorb shock when an aircraft lands. Spraying parts with an HVOF coating protects them and offers wear and corrosion resistance superior to chromium plating. This is just one of the many benefits of the HVOF process when compared to other thermal spray processes. Others include:
- High density
- High bond strength
- Improved hardness and toughness
- Higher coating thickness capability than other thermal spraying processes
- Increased corrosion resistance
- Smoother as-sprayed and ground surface finishes when compared to other thermal spraying processes