Commercial coatings comprise epoxy, phenolic, silicone, and urethane, however increasing demands for overall performance have ushered in brand new materials and process developments in the industrial coatings market place.
Surfaces subject to abrasive or even erosive wear, extreme temperature, corrosion, or require dimensional restoration or electrical padding, as examples, can benefit significantly from high-velocity o2 fuel (HVOF) type films. Developed in the 1980s, this particular branch of thermal spray topcoats brings surface property improvements that can include: adhesive power, hardness, and resistance to scratching or permeation, using a broad variety of alloyed metals and hard powders transformed into a plasticized state while fed via a high-temperature gas stream.
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Also called "wire flame spray" as well as "combustion wire coating process", the process utilizes an oxygen-fuel gas flame for the warmth source. Both wire contact form and solid rod feed-stock are utilized.
The outermost suggestion of the wire or fishing rod is melted as it goes by through the flame and is "atomized" into very small particles with a surrounding jet of compacted air, propelled to the work-piece to form the coating at the surface.
Substrate temperatures stay comparatively low in the HVOF coating process, little high temperature is imparted to the work-piece, so risk of distortion through heat is minimal, a maximum of a few hundred degrees Farrenheit, typically, making most alloys compatible with the coating procedure, including iron, steel, austenite or martensite grades associated with stainless steel, alloys of copper mineral and aluminum. Builds (coating thickness) as high as 0.250 are attainable.
In addition, the RoHS compliance regarding HVOF coatings brings substantial advantage over metal completing processes such as hard stainless plating.
Markets for higher velocity oxygen fuel (HVOF) industrial coatings include auto, medical, defense and sub stratosphere, printing and paper, meals processing, industrial and production, military, aerospace and protection, and more.
Restoring surface sizes of worn components is a very common use of this coating method. However, uses involving collection or point contact, shear loads, higher stress, ought to be avoided, such as gear smile, splines or threads.
With regard to newly-engineered surfaces requiring efficiency solutions to abrasive wear, HVOF coatings based on tungsten carbide can be an excellent choice. Within applications of surface fatigue, movement between contacting areas, conquering friction relating to wear, molybdenum can serve well.
Energy spray coatings can resolve a variety of issues relating to mechanised, electrical, or corrosion. But keep in mind that no strength is actually added to the base material. Areas must be able to withstand the actual mechanical loads in service; nitride or heat treat because needed.
HVOF is a flexible coating process, offers a selection of materials as metal surface finishes. Extrusion dies, piston bands, bearing journals are common samples of use. What surface attributes will you bring to your item or process, using large velocity oxygen-fuel coatings?