Abradable....

Abradable

Abradable: A Thermal Spray Coating that can either be applied by Plasma Spraying or Combustion Powder spraying that is used as a clearance control coating in Compressors and Turbines.

Abrasive Wear

Abrasive Wear: Wear due to hard particles or protuberances forced against & moving along a solid surface.

Acoustic Room

Acoustic Room: A soundproof enclosure, containing Thermal Spray Equipment eg Plasma or HVOF. It is designed to contain the high noise levels associated with the Thermal Spray Process from escaping to the local environment

Adhesion

Adhesion: A binding force that holds together molecules of substances whose surfaces are in contact or near proximity

Adhesive Strength

Adhesive Strength: The size of attractive forces generally physical in nature, between a Thermal Spray Coating and the substrate.

Adhesive wear

Adhesive wear: Wear due to localized bonding between contacting solid surfaces leading to material transfer between the two surfaces or the loss from either surface.

Agglomerate

Agglomerate: Several particles adhering together as in: Agglomerated Powder used in Thermal Spraying.

Air classification

Air classification: The separation of powder into particle size fractions by means of an air stream of controlled velocity.

Aluminising (Thermal spray method)

Aluminising (Thermal spray method): Thermally sprayed coatings of aluminium usually on substrates of steel or nickel chromium alloys which are subsequently heat treated to aluminise the surface. See “TSA”.

Anode

Anode: The electrode maintained at a positive electrical potential. In typical Plasma Spraying gun designs this is typically called the nozzle.

Arc

Arc: A luminous discharge of electrical current crossing the gap between two electrodes

Arc Gas

Arc Gas: The gas introduced in to the arc chamber and ionized by the arc to form a plasma

Arc Plasma

Arc Plasma: A gas that has been heated by an electric arc to at least a partially ionized condition enabling it to conduct an electric current.

Arc Spraying

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

Atomization

Atomization:
1. The division of molten material at the end of the wire into fine particles
2. The process used in the manufacture of powder

Atomized powder

Atomized powder: A powder produced by the dispersion of molten material into particles by a rapidly moving gas or liquid stream or by mechanical dispersion.

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