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Advanced Surfacing Technology Glossary

Alumina:
A chemical compound (aluminum oxide); a ceramic used in powder or rod form in thermal spraying operations. May also be a blasting medium.

Abrasive Blasting:
Process using angular blast media to clean and profile the surface to an approximate surface Ra for preparation for most thermal spray and cold spray processing. Technique increases surface area and removes oxides at the interface.

Abrasion Resistant Coatings:
A property which allows a material to resist wear. Materials which are abrasion resistant are useful for situations in which mechanical wearing and damage can occur. This allows the material to retain its integrity and hold its form. This can be important when the form of a material is critical to its function, as seen when moving parts are carefully machined for maximum efficiency.

Bond Strength:
The force required to pull a coating free of a substrate, usually expressed in kPa (psi)

Ceramic Coating:
A nonmetallic, inorganic coating made of sprayed aluminum oxide or of zirconium oxide, or a cemented coating of an intermetallic compound, such as aluminum disilicide, applied as a protective film on metal to protect against temperatures above 1100°C.

Cold Spray:
is a spray processing based on a supersonic gas jet accelerating coating powder particles to Mach 2-3 (600-900 m/s).

Electric Arc Spraying:
A thermal spraying process using an arc between two consumable electrodes of surfacing materials as a heat source and a compressed gas to atomize and propel the surfacing material to the substrate.

Flame Spray Coating:
A thermal spraying process in which an oxygen/fuel gas flame is the source of heat for melting the surfacing material. Compressed gas may or may not be used for atomizing and propelling the surfacing material to the substrate.

Fretting:
Surface damage resulting from relative motion between surfaces in contact under pressure.

Hard Coating:
Usually a dielectric coating on glass or plastic optics; a coating that is comparable in hardness to glass itself.

High Pressure Cold Spray:
A System that produce dense, phase-pure metals, alloys and composite coatings. Coatings are applied on metals, alloys and some polymer substrates with bond strength similar to Thermal Spray processes.

HVOF Coatings:
A high velocity flame spray process. Acronym is High Velocity Oxygen Fuel.

Industrial Coatings:
An industrial coating defined by its protective, rather than its aesthetic properties, although it can provide both.

Metal Coating:
Surfacing techniques to a base material in order to add specific surface properties, such as corrosion or oxidation resistance, wear resistance, optical characteristics, etc.

Plasma Spray:
A thermal spraying process in which a non-transferred arc is utilized as the source of heat that ionizes a gas which melts and propels the coating material to the workpiece.

Shear Stress:
The stress on the slip plane produced by external loads tending to slide adjacent planes with respect to each other in the direction parallel to the planes.

Spray Angle:
The angle of particle impingement, measured from the surface of the substrate to the axis of the spraying nozzle

Super Finishing:
Honing of the surface using designated abrasive including industrial diamonds to remove chatter from roll surface and polish to >5Ra.

Thermal Spray:
A group of processes in which finely divided metallic or nonmetallic surfacing materials are deposited in a molten or semimolten condition on a substrate to form a spray deposit. The surfacing material may be in the form of powder, rod, cord, or wire.

Tungsten Carbide Coating:
An extremely hard, fine gray powder whose composition is WC, used in tools, dies, wear-resistant machine parts, and abrasives.

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