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Thermal Spray Technology

  • Tribology: The science and technology concerned with interacting surfaces in relative motion
  • Coating: The act of building a deposit on a substrate
  • The spray deposit
  • Thermal Spraying: A group of processes in which finely divided metallic or nonmetallic surfacing materials are deposited in a molten or semi-molten state onto a substrate to form a deposit
  • Thermal Barrier Coatings: A group of ceramic coatings, including Yttria Stabilized Zirconia (YSZ) and Magnesium/Zirconate, used to protect the substrate in extreme heat environments. The heat rejection properties of TBCs excel in applications to an excess of 3000 °F. TBCs have been used successfully on piston tops, valves, exhaust systems, etc.
  • Splat: A single sprayed particle that resembles a thin, flattened drop of liquid, under magnification.
  • Metallic bond: The principal bond that holds metals together and is formed between base metals and filler metals in all processes
  • Mechanical bond: The adherence of a thermal spray deposit to a roughened surface by the mechanism of interlocking particles
  • Gradated coating: A thermal spray deposit composed of mixed materials in successive layers that progressively change in composition from the constituent material lot to the surface of the sprayed deposit
  • Composite coating: A coating consisting of two or more dissimilar spray materials which may or may not be layered
  • Plasma spraying: A thermal spray process in which a non transferred arc is used as the source of heat that ionizes a gas which, in turn, melts and propels the coating material to the work piece
  • Abrasion: To wear away by friction.
  • Wear: To damage, erode or consume by long, hard use
  • Spalling: The flaking or separation of a sprayed coating
  • Abradable seals: A seal made from mating two soft metal, or metal containing soft graphite, surfaces together using friction and pressure
  • Grit blasting: The preparation of a substrate for the thermal spray process by blasting with sharp irregular shaped grains to produce a pitted surface
  • Bond strength: The force required to pull a coating free of a substrate, usually expressed in kPa (psi)
  • Anode: The electrode maintained at a positive electrical potential
  • Cathode: The electrode maintained at a negative electric potential
  • Arc: A luminous discharge of electrical current crossing the gap between two electrodes
  • Plasma: An electrically neutral, highly ionized gas composed of electrons, ions, and neutral particles
  • Deposition rate: The weight of material deposited in a unit of time
  • Feed rate: A nonstandard term for spray rate
  • Powder: Material manufactured into finely divided particles. When blended for thermal spraying, powder falls within a specific mesh range, usually finer than 120 mesh (125 microns)
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Girish Mathur (Marketing Head)
E-101, M. I. A., 2nd Phase, Basni
Jodhpur- 342001, Rajasthan, India



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