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'''Graphalloy''' is the trademark for a group of [[metal]]-impregnated [[graphite]] materials.<ref>{{Citation |title = GRAPHALLOY FAQs|url = http://www.graphalloy.com/html/faq.html|access-date = 2010-04-06|postscript = .}}</ref> The materials are commonly used for self-lubricating [[plain bearing]]s or [[electrical contact]]s. 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 of materials|strength]], and [[heat sink|heat dissipation]] properties.<ref name="bloch">{{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 =.}}</ref>

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

{| class="wikitable"
|+ Types of Graphalloy<ref>{{Citation | last = Woldman | first = Norman Emme | last2 = Frick | first2 = John P. | title = Woldman's engineering alloys | publisher = [[ASM International (society)|ASM International]] | page = 501 | year = 2000 | edition = 9th | url = https://books.google.com/books?id=RzMOiOEQ-oMC | isbn = 978-0-87170-691-1 | postscript =.}}</ref>
|-
! Type !! Impregnated material(s) !! Comments
|-
| Graphalloy Babbitt || Bearing grade [[tin]] alloy and [[lead]] based [[Babbitt (metal)|Babbitt]] || Tensile strength: {{convert|5000|psi|MPa|abbr=on}}. Crushing strength: {{convert|19000|psi|MPa|abbr=on}}. Applications: bearings, seal rings, and contact shoes.
|-
| Graphalloy bronze || [[Bronze]] || Tensile strength: {{convert|5500|psi|MPa|abbr=on}}. Crushing strength: {{convert|24000|psi|MPa|abbr=on}}. Applications: bearings, seal rings, and contacts.
|-
| Graphalloy copper || [[Copper]] || Tensile strength: {{convert|6000|psi|MPa|abbr=on}}. Crushing strength: {{convert|25000|psi|MPa|abbr=on}}. Applications: slip ring bushes, bearings, and contacts.
|-
| Graphalloy iron || [[Iron]] || Tensile strength: {{convert|6000|psi|MPa|abbr=on}}. Crushing strength: {{convert|25000|psi|MPa|abbr=on}}. Application: submerged bearings.
|-
| Graphalloy silver 8 || [[Silver]] || Tensile strength: {{convert|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 (lubricant)|grease]] or [[oil]] is not feasible, expulsion of wear particles is prohibited, or in dusty, submerged, or [[corrosion|corrosive]] environments. It is non-corrosive in [[gasoline]], [[jet fuel]], [[solvent]]s, [[bleach]]es, [[Corrosive|caustics]], [[dye]]s, [[liquefied gas]]es, [[acid]]s, and many more chemicals. It is not used in highly [[abrasive]] applications. Common applications include [[pump]]s, bleaching and washing tanks, [[oven]]s, [[industrial dryer]]s, [[steam turbine]]s, [[kiln]]s, [[cryogenics]].<ref name="bloch"/><ref name="tribomat">{{Citation |title = Typical applications|url = http://www.tribomat.com/html/typicalapp.htm|access-date = 2010-04-07|postscript = .}}</ref>

It is also used as bearing in applications where [[electrical conduction]] is necessary. It is used in when high frequency current degrades [[ball bearing|ball]] or [[needle bearing]]s. Examples of applications include [[packaging and labeling|packaging machine]]s, [[radar]] joints, and [[welding]] equipment.<ref name="tribomat"/>

==References==
{{Reflist}}

==External links==
* {{official website|https://www.graphalloy.com/}}

[[Category:Composite materials]]
[[Category:Bearings (mechanical)]]

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