“Graphalloy”的意思、由来-开放百科全书

词条

Graphalloy

释义

Construction
Types
Applications
References

Graphalloy is a group of metal impregnated graphite materials.^[1] The materials are commonly used for self-lubricating plain bearings or electrical contacts. They are proprietary materials owned by the Graphite Metallizing Corp.

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.^[2]

Types

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

Types of Graphalloy^[3]
Type	Impregnated material(s)	Comments
Graphalloy Babbitt	Bearing grade tin alloy and lead based Babbitt	5000\|psi\|MPa\|abbr=on}}. Crushing strength: {{convert\|19000\|psi\|MPa\|abbr=on}}. Applications: bearings, seal rings, and contact shoes.
Graphalloy bronze	Bronze	5500\|psi\|MPa\|abbr=on}}. Crushing strength: {{convert\|24000\|psi\|MPa\|abbr=on}}. Applications: bearings, seal rings, and contacts.
Graphalloy copper	Copper	6000\|psi\|MPa\|abbr=on}}. Crushing strength: {{convert\|25000\|psi\|MPa\|abbr=on}}. Applications: slip ring bushes, bearings, and contacts.
Graphalloy iron	Iron	6000\|psi\|MPa\|abbr=on}}. Crushing strength: {{convert\|25000\|psi\|MPa\|abbr=on}}. Application: submerged bearings.
Graphalloy silver 8	Silver	5500\|psi\|MPa\|abbr=on}}. Crushing strength: {{convert\|24000\|psi\|MPa\|abbr=on}}. 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 pumps, bleaching and washing tanks, ovens, industrial dryers, steam turbines, kilns, cryogenics.^[2]^[4]

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.^[4]

References

1. ^{{Citation |title = GRAPHALLOY FAQs|url = http://www.graphalloy.com/html/faq.html|accessdate = 2010-04-06|archiveurl = |archivedate = |postscript = .}}
2. ^¹{{Citation | last = Bloch | first = Heinz P. | last2 = Geitner | first2 = Fred K. | title = Major process equipment maintenance and repair | page = 110 | publisher = Gulf Professional Publishing | year = 1997 | edition = 2nd | url = https://books.google.com/books?id=IpBaybUJ5T8C&pg=PA110 | isbn = 978-0-88415-663-5 | postscript =.}}
3. ^{{Citation | last = Woldman | first = Norman Emme | last2 = Frick | first2 = John P. | title = Woldman's engineering alloys | publisher = ASM International | page = 501 | year = 2000 | edition = 9th | url = https://books.google.com/books?id=RzMOiOEQ-oMC | isbn = 978-0-87170-691-1 | postscript =.}}
4. ^¹{{Citation |title = Typical applications|url = http://www.tribomat.com/html/typicalapp.htm|accessdate = 2010-04-07|archiveurl = |archivedate = |postscript = .}}

2 : Composite materials|Bearings (mechanical)

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