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Graphalloy

Graphalloy is the trademark for a group of metal-impregnated graphite materials. The materials are commonly used for self-lubricating plain bearings or electrical contacts. They are proprietary materials owned by the Graphite Metallizing Corp. based in Yonkers, New York, USA.

Construction

When the metal is impregnated in the graphite it forms long continuous filaments. These are what gives the material its ductility, strength, and heat dissipation properties.

Types

There are many types of Graphalloy because the graphite can be impregnated with many different metals.

Type	Impregnated material(s)	Comments
Graphalloy Babbitt	Bearing grade tin alloy and lead based Babbitt	Tensile strength: 5000 psi. Crushing strength: 19000 psi. Applications: bearings, seal rings, and contact shoes.
Graphalloy bronze	Bronze	Tensile strength: 5500 psi. Crushing strength: 24000 psi. Applications: bearings, seal rings, and contacts.
Graphalloy copper	Copper	Tensile strength: 6000 psi. Crushing strength: 25000 psi. Applications: slip ring bushes, bearings, and contacts.
Graphalloy iron	Iron	Tensile strength: 6000 psi. Crushing strength: 25000 psi. Application: submerged bearings.
Graphalloy silver 8	Silver	Tensile strength: 5500 psi. Crushing strength: 24000 psi. Applications: bushes, bearings, and contacts.

Applications

Graphalloy is used in applications where high and low temperatures are encountered, grease or oil is not feasible, expulsion of wear particles is prohibited, or in dusty, submerged, or corrosive environments. It is non-corrosive in gasoline, jet fuel, solvents, bleaches, caustics, dyes, liquefied gases, acids, and many more chemicals. It is not used in highly abrasive applications. Common applications include bushings/bearings for pumps, bleaching and washing tanks, ovens, industrial dryers, steam turbines, kilns, cryogenics.

It is also used as bearing in applications where electrical conduction is necessary. It is used in when high frequency current degrades ball or needle bearings. Examples of applications include packaging machines, radar joints, and welding equipment.

References

"GRAPHALLOY FAQs".
Bloch, Heinz P.. (1997). "Major process equipment maintenance and repair". Gulf Professional Publishing.
Woldman, Norman Emme. (2000). "Woldman's engineering alloys". [[ASM International (society).
"Typical applications".
"High Temperature Graphalloy Bearings".
"Pump Bushings Graphalloy".

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

composite-materials bearings-(mechanical)

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