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Thursday, July 23, 2009 - 13:56

WS2 low friction coatings (known as tungsten disulfide, also spelled disulphide) are also widely accepted forms of solid film lubrication today. Their uniqueness comes from their atomic structure, weak interaction (Van der Waals) of the sulfide anions, while covalent bonds within tungsten remain strong.

Thus, its lubrication relies on slippage along the sulfur atoms. No moisture is needed for lubrication, which makes them ideal under hard vacuum.

Thursday, July 23, 2009 - 13:56

MoS2 low friction coatings (also known as molybdenum disulfide, also spelled, disulphide) is regarded the most widely used form of solid film lubrication today. What makes it unique (with the other dichalcogenides) is the weak atomic interaction (Van der Waals) of the sulfide anions, while covalent bonds within molybdenum are strong.

Thursday, July 23, 2009 - 13:56

Dry film lubricants low friction coatings can be excellent means to achieving low friction.

Unlike greases, oils, or ‘wet’ lubricants, dry film lubricants low friction coatings can be utilized in extreme environments, such as very high temperature or pressure, even under vacuum, where other, organic-based compounds like PTFE (polytetrafluoroethylene) will ‘cold flow’, never survive.

Thursday, July 23, 2009 - 13:56

Teflon low friction coatings can be an excellent means to create low friction surfaces. Compounds that incorporate PTFE (polytetrafluoroethylene) are widely recognized for their performance.

PTFE, formed by free radical vinyl polymerization of tetrafluoroethylene (TFE), is known for its high heat stability. Service temperatures from cryogenic to to 550 F are attainable.

This provides a large ‘window’ of applications requiring low friction.

Thursday, July 23, 2009 - 13:56

Dry film lubricants are defined as one or more solids used between two surfaces in relative motion for the purpose of lowering friction or reducing wear.

Unlike greases (solid or semi-fluid based dispersions of a thickening agent in a lubricant) or the use of oils.

Also known as solid films, these are best utilized in extreme environments, such as very high temperature or pressure, where organic-based compounds could never survive.

Thursday, July 23, 2009 - 13:56

Dupont Teflon, a trademarked name, is also available in polytetrafluoroethylene (PTFE).

This fluoropolymer, also manufactured by others, is one of the most widely recognized compounds used throughout the world. Its applications are near endless.

Dupont PTFE is a product formed by free radical vinyl polymerization of tetrafluoroethylene (TFE) and is known to have a continuous service temperature of 500 F. Much higher temperatures can be satisfactorily sustained for shorter exposures.

Thursday, July 23, 2009 - 13:56

Thermal spraying is a process by which metals, alloys, or ceramic coatings are applied to a surface in their molten or semi-molten state. Hot thermal spray particles are atomized, accelerated toward the work by a stream of jet air.

Thursday, July 23, 2009 - 13:56

Chemical Vapor Deposition (CVD) is a coating process involving gaseous chemical compounds transported to a reaction chamber, activated thermally close to the prepared substrate, and made to react to form a solid deposit on the surface.

Carbides, nitrides, borides, and oxide coatings are just some of the desired products, formed by a metal halide vapor accompanied by a reactive gas species.

Thursday, July 23, 2009 - 13:56

Anodizing is a common process in the finishing industry for electrolytic treatment of metals to form stable films or coatings on the metalTeflon nickel acetate, wear, tribology surface. Anodized aluminum or magnesium, for example, are typically associated with functional coatings like hard anodize, also known as ‘hardcoat’.

In this process, unlike electroplating, the work is made the anode, and its surface is converted to a form of its oxide that is integral with the metal substrate.

Generally, it’s agreed that the ceramic oxide coating consists of two layers:

Thursday, July 23, 2009 - 13:56

Hardening to promote wear resistance is accomplished by a variety of means. Here, we will discuss aspects of heat treating, nitriding, and carburizing. All are recognized for their comparatively thin films.

Heat treatment comprises myriad processes, each with a specific task. They include: relief of residual stresses, creating ease in machining, altering microstructure for improved properties, and to raise hardness.

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