Industrial Coatings Are Not Just About Corrosion Protection

Industrial coatings include epoxy, phenolic, silicone, and urethane, but increasing performance demands have introduced new materials and process advancements to the industrial coatings market.

Surfaces subject to abrasive or erosive wear, extreme heat, corrosion, or requiring dimensional restoration or electrical insulation, for example, can greatly benefit from high velocity oxygen type (HVOF) coatings. Developed in the 1980s, this branch of thermal spray coatings provides surface property improvements which may include: adhesion strength, hardness and resistance to abrasion or permeation, using a wide range of alloy metals and ceramic powders transformed into a plasticized state while passing through a high temperature gas stream. You can know more here BGA underfill epoxy.

Also called "wire flame spraying" or "combustion wire coating process", the process uses an oxygen-fuel gas flame for the heat source. Wire form and solid rod feedstock are used.

The outermost tip of the wire or rod is melted as it passes through the flame and is "atomized" into very small particles by a surrounding jet of compressed air, propelled towards the work piece to form the coating to the surface.

Substrate temperatures are kept relatively low in the HVOF coating process, little heat is transmitted to the part, so the risk of heat distortion is minimal, no more than a few hundred degrees F, typically, making the most metals compatible with the coating process, including: iron, steel, austenitic or martensitic stainless steel grades, copper and aluminum alloys. Constructions (coating thickness) as high as 0.250 inch are achievable.

Additionally, the RoHS compliance of HVOF coatings provides a significant advantage over metal finishing processes such as hard chrome plating.

Markets for High Velocity Oxygen (HVOF) Industrial Coatings include: Automotive, Medical, Defense & Aerospace, Printing & Paper, Food Processing, Industrial & Manufacturing, military, aerospace and defense, etc.

Restoring the surface dimensions of worn components is a common use of this coating process. However, uses involving line or point contact, shear loads, higher stresses, should be avoided, such as gear teeth, splines or threads.

For newly engineered surfaces requiring performance solutions to abrasive wear, HVOF coatings based on tungsten carbide can be an excellent choice. In applications of surface fatigue, movement between contact areas, overcoming wear-related friction, molybdenum can serve well.

Thermal spray coatings can solve a variety of mechanical, electrical or corrosion related problems. However, keep in mind that no resistance is added to the base material. The surfaces must be able to withstand the mechanical stresses in service; nitride or heat treatment as required.

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