NDLI: Railgun Tribology—Chemical Reactions Between Contacts

Content Provider	IEEE Xplore Digital Library
Author	Persad, C.
Copyright Year	1965
Abstract	Many electromagnetic launcher experiments have been conducted with armature-rail pairs made of dissimilar alloys. When the armature is made of an aluminum alloy, the eventual formation of aluminide intermetallics is likely at the sliding contact interfaces with nonaluminum rails. Because most launcher bores are freely accessed by laboratory air, other reactions-oxidation, nitridation, and water vapor-may also occur during the reactive phase of the transfer of aluminum from the armature to the rail surface. The structure and composition of the thin layer that adheres to the rail contact surfaces is important, because it separates the new armature contact in a subsequent launch from the original rail contact surfaces and, thus, affects current transfer and the contact lubrication process. The chemistry and the morphology of the reaction layer on the rails will vary along the length of the launcher. In the armature start-up and low-velocity regions of the rails, the adhering rail deposit shows evidence of liquid-metal-enhanced, high-temperature reactions. Experimental data confirming the presence of these reaction products are presented for the case of the very low-speed and highly energetic propulsion of a copper armature between aluminum alloy rails. A copper aluminide intermetallic-CuAl₂-is formed, as predicted from the binary phase diagram. Intermetallics have properties that will degrade the multishot load-carrying capability of rail conductors
Sponsorship	IEEE Magnetics Society
Starting Page	391
Ending Page	396
Page Count	6
File Size	381085
File Format	PDF
ISSN	00189464
Volume Number	43
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Railguns Rails Surface morphology Aluminum alloys Intermetallic Armature Copper Electromagnetic launching Boring Laboratories tribophysics railgun tribology
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Analysis of rail surfaces from a multishot railgun

Investigation of Damage to Solid-Armature Railguns at Startup

Plated armature contacts for solid armature electromagnetic railgun launchers

Current and heat transport in the solid-armature railgun

A comparison of the wear behaviors of six elemental wire conductors

Electrodynamic transition in solid armature railguns

Rail damage and armature parameters for different railgun rail materials

Railgun Tribology: Characterization and Control of Multishot Wear Debris

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Railgun Tribology—Chemical Reactions Between Contacts

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