Glossary

A measurable factor relating to several variables; loosely used to mean a spraying variable, spraying condition, spray rate, spray distance, angle, gas pressure, gas flow, etc.

A nonstandard term for substrate. Metal. A nonstandard term for substrate. rent Metal. A nonstandard term for substrate.

The average diameter of a given powder or grit granule.

Classification of powdered materials as determined by various testing methods defining the particle sizes and quantities in a given sample.

See preferred term Particle Size Distribution.

A single progression of the thermal spray device across the surface of the substrate.

See preferred term Thermal Spraying Gun.

See Arc Plasma.

See preferred term Arc Gas. Plasma Metallizing. A nonstandard term for plasma spraying.

A thermal spraying process in which a nontransferred arc is utilized as the source of heat that ionizes a gas which melts and propels the coating material to the workpiece.

The space between the inside wall of constricting nozzle and the electrode.

Cavity type discontinuities within a sprayed coating (voids).

The time interval between plasma arc shutdown and electrode cooling, to inhibit oxidation of electrodes.

The application of heat to an assembly after a thermal spraying operation.

Material manufactured into finely divided particles. When explicitly blended for thermal spraying, powder falls within a specific mesh range, usually finer than 120 mesh (125 microns). Fine powder is usually defined as having particles smaller than 325 mesh (44 microns).

Powder prepared from a homogeneous molten mixture of elements, and sometimes entrapped carbides or metal oxides. All of the particles have approximately the same composition.

A heterogeneous mixture of two or more alloy powders.

Powder or wire wherein one alloy is encapsulated in another; a composite.

Two or more independent materials, combined to form a single integrated unit. May be either chemically clad or mechanically agglomerated.

A device for conveying powdered materials to thermal spraying equipment.

See preferred term Carrier Gas.

The quantity of powder introduced into the hot, gaseous stream per unit of time.

A thermal spraying process variation in which the material to be sprayed is in powder form; all oxyfuel gas processes. See Flame Spraying (FLSP).

A nonstandard term for powder flame spraying.

Internal or external orifice through which powder is injected into flame or plasma.

The time interval between start of shielding gas flow and arc or gas ignition.

The heat applied to the base metal or substrate immediately before spraying.

A specified temperature that the substrate is required to attain immediately before material deposition.

The major constituent of the arc gas fed to the gun to produce the plasma; usually argon or nitrogen.

The detailed elements of a process or method used to produce a specific result.

A gas envelope or vacuum surrounding the part to be thermally sprayed, with the gas composition controlled with respect to chemical composition; dewpoint, pressure, flow rate, etc. Examples are inert gases, combusted fuel gases, hydrogen and vacuum

Curtains or portable fireproof canvas shields, sometimes required to enclose work areas, when there is a possibility of the spray stream being misdirected, or where the glare of the arc or flame could injure unprotected eyes.

Leather or metal coated articles designed to prevent burns from ultraviolet radiation or misdirected particles.