Plasma Spray Vs. HVOF: How To Decide

Two of the best insulating coatings to confirm the authenticity of parts are plasma spray or HVOF (high-velocity oxygen fuel). Consider when to apply plasma spray vs. HVOF to strengthen your parts.

Plasma Spray for Parts Under Extreme Heat Stress

One of the best examples of delivering plasma spray to fuel an essential part is the turbine engine installed inside airplanes. The aerospace/aviation industry applies plasma spray for treating turbine engines to allow turbines to resist the intense degree of force or heat required to fuel propel a massive aircraft off ground surfaces or within the air.

During the process, applied pressure in the engine grows swiftly. Applied for long periods under severe conditions, the combination of heat, force, or pressure may diminish the intactness of the component.

Still, plasma spray coating heightens the component’s durability or preserves longevity by coating each component within some hot temperatures — reaching 27,000 degrees Fahrenheit.

The component gets purified with fire to extend longevity and resistance. Once inserted back inside the machines, the coated sections are very durable towards temperatures, which could pare down each component lacking coating.

Similarly, in alternative intensive industries (including oil, energy, manufacturing, or gas), plasma spray coatings upon important components generate a heat shield or heighten corrosion resistance. It enables machinery to persist in reaching optimum productivity.

HVOF for Parts Susceptible to Wearing Down

HVOF works well for raising the material durability of components needed to support machinery or remain vulnerable to erosion, abrasion, or dents. For example, all shafts are employed for aircraft landing equipment.

The landing gear must work well when confronted with high pressure and force that help land a big plane. To stop breaking or wear, landing gear must get shielded using HVOF coating.

The delivery of these thermal spray coatings is uniformly spread over the substrate to derive some very tough surfaces that may resist strong conditions.

HVOF generates a very adhesive molecular bond, heightening the component’s wear resistance. This works well for the parking gear shafts to resist strong wear for an extended time.

– Also, for gas and oil, HVOF gets applied for treating crucial components carrying out essential tasks, including ball valves. The components get applied to assist with valves’ functions, which regulate these goods’ operations.

With coating, ball valves gain a greater capacity for resisting severe conditions for continually driving the essential functions of operations piloting.

HVOF Process

With the HVOF procedures, you may gradually apply carbide coatings with processed carbides (i.e., regular carbide size < 3 µm) or heavy carbide mass fractions slightly higher than 80%. These provide stronger wear resistance to tiny abrasive particles. Coating mass is restricted to around 0.5 mm, while the coatings do not cohere with uses where the coatings might prove very vulnerable to heavy thermal or mechanical stresses. HVOF coatings are usually utilized under illumination to control wear applications or corrosive fluid.

All alternative procedures may limit the carbide size or proportion due to the heavy processing temperature or intervals. Smaller carbide particles might decay within these intense processing temperatures, resulting in the growth of unwanted fragile and restricted phases within the binder alloy or a lowering in the carbide percentages. Thus, a PTA or laser carbide coating might contain a regular carbide size of around 200 µm (or 0.2 mm) or a carbide mass percentage falling beneath 60%.

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