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HVOF Thermal Spray

HVOF stands for High-Velocity Oxygen Fuel, and from its name, it is easy to infer that this thermal spray process has to do with using molten materials at a high speed on substrates. HVOF thermal spray can supply many unique coating properties for applications across different industries, and that reason the HVOF thermal spray process has become one of the most widely utilized methods to create dense coatings on various types of surfaces.



However, like all things in the world, there are always pros and cons to consider. In this post, you will learn about all the merits of using this process as well as the demerits that it can bring.

The high-velocity oxy-fuel process was invented only 20 years ago, yet has thrust the thermal spray application range into areas that were once unobtainable. In HVOF spraying, a combination of process gases, such as hydrogen, oxygen, and air, is injected into the combustion chamber of the torch at high pressure and ignited. The resulting gas velocities achieve supersonic speeds. The powder is injected into the flame and also accelerated to supersonic speed. 



The HVOF process is the preferred technique for spraying wear and corrosion-resistant carbides as well as Hastelloy, Triaballoy and Inconel alloys. The coatings have high bond strengths, fine as-sprayed surface finishes, and level of oxide is low.

Worn Conveyor Screws. Conveyor screws are used in power plants to transport limestone into the boilers. The customer used a screw manufactured from carbon steel, and it needed to be replaced/repaired yearly due to the abrasion of the limestone. The thermal spray was to apply a thin layer of wear-resistant tungsten carbide on the shaft of the flights using the HVOF system. This repair procedure has increased the life of the screw.

Steel Blowers. The same customer as in the previous description used steel blowers that were three inches in diameter to move the corrosive gases through the ducts. However, the sulfuric acid in the gases caused the steel to corrode and unbalance the blower. The blower needed repair every six months.  Now the blower is repaired every 24 months, a 300% increase in life.
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Comments

  1. Rohan Bhansali13 January 2020 at 21:08

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  4. Rahul Sharma1 December 2020 at 02:42

    Great Post,

    Thanks a lot for sharing the great piece of the content with us. The point you mention in your post HVOF Thermal Spray that are very useful for me.

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    Regards,
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    ReplyDelete
  5. Manish Jangid1 December 2020 at 22:19

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  7. Digvijay singh11 December 2020 at 02:00

    Great work!!!
    Awesome post! This is helpful post. This article is clear and with lots of useful information. Thanks!!
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