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What are Self-Bonding Materials? |
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| A chemical compound (aluminum oxide);a ceramic used in powder or rod form in thermal spraying operations. May also be a blasting medium. |
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| *What is Arc Spraying (ASP)? |
| 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. |
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| *What is Atomization? |
(1) The division of molten material at the end of the wire or rod into fine particles.
(2) The process used in the manufacture of powder. |
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| Any material to which a thermal spraying deposit is applied. |
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| A method of cleaning or surface roughening by a forcibly projected stream of sharp angular abrasive. |
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| A preliminary (or prime coat) of material that improves adherence of the subsequent spray deposit. |
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| The force that holds two atoms together; it results from a decrease in energy as two atoms are brought closer to one another. |
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| The interface between a thermal spraying deposit and substrate, or between adhesive and adherent in an adhesive bonded joint. |
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| A surfacing variation in which surfacing metal is deposited to achieve the required dimensions. |
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A thermal spraying process variation in which the material to be sprayed is in ceramic rod form. See Flame Spraying (FLSP). |
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| A physical mixture of ceramics and metals; examples are alumina plus nickel and zirconia plus nickel. |
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| A surfacing variation that deposits or applies surfacing material, usually to improve corrosion or heat resistance. |
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*What is a Clad Metal? |
| A laminar composite consisting of a metal, with a metal of different chemical composition applied to one or two sides. |
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| (1) The act of building a deposit on a substrate, (2) the spray deposit. |
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| A nonstandard term for spray deposit density ratio. |
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| Adding a shoulder to a shaft or similar component as a protective confining wall for the thermal spray deposit. |
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| The ratio, usually expressed in percent, of the weight of spray deposit to the weight of the material sprayed. |
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| The weight of material deposited in a unit of time. |
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| A thermal spraying process variation in which the controlled explosion of a mixture of fuel gas and oxygen is utilized to melt and propel the material to the workpiece? |
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| A method of surface roughening involving angular undercutting to interlock the spray deposit. |
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| A thermal spraying process in which an oxyfuel 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. |
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| Gases such as acetylene, natural gas, hydrogen, propane, stabilized methylacetylene propadiene, and other fuels, and hydrocarbons, usually used with oxygen for heating. |
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| A self-fluxing spray deposit which is subsequently heated to coalescence within itself and with the substrate. |
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| The melting together of filler metal and metal (substrate), which results in coalescence. |
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*What is a Gradated Coating? |
| A thermal spraying deposit composed of mixed materials in successive layers which progressively change in composition from the constituent material lot the, substrate to the surface of the sprayed deposit. Also referred to as graduated or graded coating. |
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| A surfacing variation in which surfacing metal is deposited to reduce wear. |
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| High Velocity Oxygen Fuel/High Velocity Air Fuel. A high velocity flame spray process. |
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| A primary bond arising from the electrostatic attraction between two oppositely charged ions. |
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| The adherence of a thermal spraying deposit to a roughened surface by the mechanism of particle interlocking. |
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| The principal bond that holds metals together and is formed between base metals and filler metals in all processes. This is a primary bond arising from the increased spatial extension of the valence electron wave functions when an aggregate of metal atoms is brought close together. See also Bonding Force, and Ionic Bond. |
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| A thermal spraying process variation in which the metallic material to be sprayed is in the molten condition. See Flame Spraying (FLSP). |
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| An oxyfuel gas flame having an oxidizing effect (excess oxygen). |
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| 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. |
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| 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). |
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| A thermal spraying process variation in which the material to be sprayed is in powder form; all oxyfuel gas processes. See Flame Spraying (FLSP). |
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| A nonstandard term for powder flame spraying. |
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| 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. |
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| A method of surface roughening in which a revolving roughening tool is pressed against the surface being prepared, while either the work or the tool, or both, move. |
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| Surfacing materials that "wet" the substrate and coalesce when heated to their melting point, without the addition of an externally applied flux. These alloys contain boron or silicon, or both, as fluxing agents. |
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*What is Shielding Gas? |
| Protective gas used to prevent or minimize atmospheric contamination. See also Protective Atmosphere. |
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| A single thin flattened sprayed particle. |
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| Extremely rapid, high rate of cooling, the effects of which can be observed in thermal spraying deposits leading to the formation of metastable phases and an amorphous microstructure. |
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| The ratio of the density of the spray deposit to the theoretical density of the surfacing material. Usually expressed as percent of theoretical density. |
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| Any material to which a thermal spraying deposit is applied. |
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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.
See also Arc Spraying, Flame Spraying, and Plasma Spraying. |
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*What is Thermal Stress? |
| Stress resulting from nonuniform temperature distribution. |
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| A thermal spraying process variation in which the surfacing material is in wire form. See Flame Spraying (FLSP). |
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