HVAF coating: thermal spray processes

What is HVAF coating?

HVAF stands for High-Velocity Air Fueling or High-Velocity Air-Fuel, and it generally refers to a thermal spray coating process. In this context, HVAF is a technology used for applying coatings to surfaces for various purposes, such as protection against wear, corrosion, or to enhance specific material properties.

In the HVAF process, a mixture of fuel and compressed air is ignited, creating a high-velocity flame. This flame is then directed at a substrate, and fine particles of coating material are injected into the flame. The high velocity of the flame accelerates these particles, causing them to impact and adhere to the substrate, forming a dense and well-bonded coating.

HVAF is known for producing coatings with excellent adhesion, low porosity, and high coating density. This method is used in various industries, including aerospace, automotive, and manufacturing, to enhance the performance and durability of components and equipment. The specific properties of the coatings can be tailored based on the material used and the application requirements.

Flame Spray uses the latest generation HVAF technology, ideal for applications on external and internal diameters (with a minimum diameter of 80 mm), where the best possible wear resistance is required.

 

HVAF Coating Features

• High density: The particles are sprayed at very high speeds, forming a coating with exceptional density.
• Low porosity: Significantly reduces the presence of pores, improving resistance to corrosion and wear.
• Excellent adhesion: The HVAF process ensures optimal adhesion of the coating to the substrate, increasing the life of the coated component.

Advantages of HVAF coating

Coatings applied via the HVAF process offer numerous advantages, making them an ideal choice for critical applications in various industries. Key benefits include:

• Wear resistance: HVAF coatings provide exceptional protection against mechanical wear, ensuring longer component life.
• Hot corrosion resistance: Excellent protection against corrosion caused by high temperatures.
• Oxidation resistance: Ideal for components exposed to oxidizing conditions in high-temperature environments.
• Erosion resistance: Advanced protection for surfaces subjected to abrasive or corrosive flows.
• Temperature resistance: Ideal for applications in contact with high temperatures.
• Thermal shock resistance: Protection against repeated heating and cooling cycles.
• Exceptional adhesion: Due to the velocity of the particles, HVAF coatings exhibit superior bond strength, reducing the risk of delamination.
• Material flexibility: HVAF can be used with a wide range of materials, including carbides, metals and ceramics.

HVAF Coating Applications

Due to its versatility and excellent physical properties, HVAF coating is used in a variety of industries to improve component performance and life. Some of the key industries include:

• Power Generation: Coatings for turbines and other components subject to erosion and corrosion.
• Renewable Energy: Protection of wind turbine blades and other structures exposed to adverse weather conditions.
• Transportation: Protection of wear parts such as pistons, shafts and bearings.
• Paper and Printing: Anti-wear coatings for rollers and other key components.
• Petrochemical: Resistance to high temperatures and corrosive environments in refining and chemical manufacturing processes.
• General Industrial Applications: Improved tribological properties and erosion resistance in various industrial plants.

Flame Spray HVAF Service

HVAF coating is a technologically advanced solution to protect and improve the performance of industrial components in critical sectors. Thanks to its extraordinary adhesion, density and resistance properties, it has become one of the most popular thermal spray methods to address the challenges of wear, corrosion and erosion.

Flame Spray is at your service to provide you with the most advanced solutions in the field of HVAF coatings, ensuring unmatched performance and reliability for all your industrial needs.