Metallizing Equipment Co. Pvt. Ltd.
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Terminology

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 nontransferred 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).

Carbide :
A chemical compound formed between carbon and a metal or metals; examples include tungsten carbide, tantalum carbide, titanium carbide, chromium carbide.

Ceramic :
Any of the various hard, heat-resistant, and corrosion resistant coatings made up of non-metallic materials.

Cermets :
A mixture of ceramics and metals used as a thermal spray material.

Alumina :
Aluminum oxide; a ceramic used in powder or rod form in thermal spray operations.

Mask:
A device for protecting a substrate surface from the effects of blasting or adherence of a spray deposit.

Chemical Vapour Deposition(CVD):
The deposition of a coating by means of a chemical reaction in gases in a chamber producing components which deposit on and adhere to the substrate.

Cladding :
The application of a thick (generally above 1mm) coating which melts or diffuses into the substrate. Processes include weld cladding and plasma transferred arc (PTA).

Degreasing :
The removal of grease and oil from a surface. Degreasing by immersion in liquid organic solvents or by solvent vapours condensing on the parts to be cleaned.

Removal of material from a surface due to mechanical interaction between that surface and a fluid, a multicomponent fluid, or impinging liquid or solid particles.

A test designed to assess the resistance to penetration from a load. The surface is indented under a defined load and the depth or area of penetration is measured.

The hardness of a coating as measured on a macroscopic scale, which shows the coatings bulk properties.

Produced by diffusion or chemical bonding between the coating and substrate.
Loss of electrons by a constituent of a chemical reaction. (Also refers to the corrosion of a metal that is exposed to an oxidizing gas at elevated temperatures.)
An environment or material which promotes oxidation.
Shot peening :
The bombardment of a component surface with steel or ceramic shot. Produces a residual compressive stress in the surface and improves fatigue and stress corrosion performance.
Porosity :
The presence of pores or voids in a coating, usually expressed as a percentage by volume.
A name given to thermal spray coatings that are capable of bonding to clean smooth surfaces. Bond and "one-step" coatings are normally in this group. These are particularly important where grit blasting or surface roughening processes must be omitted.
Shroud :
A gaseous and/or mechanical or physical barrier placed around the spraying process designed to reduce the ingress of air into the system and so reduce oxidation of the of the materials being sprayed.
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