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Casting copper to tungsten for high power arc lamp cathodesA method for making 400-kW arc lamp cathodes is described. The cathodes are made by casting a 1.75-in. diameter copper body onto a thoriated tungsten insert. The addition of 0.5-percent nickel to the copper prevents voids from forming at the copper-tungsten interface. Cathodes made by this process have withstood more than 110 hours of operation in a 400-kW arc lamp.
Document ID
19730018724
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Will, H. A. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
August 1, 1973
Subject Category
Materials, Metallic
Report/Patent Number
E-7456
NASA-TM-X-2865
Report Number: E-7456
Report Number: NASA-TM-X-2865
Accession Number
73N27451
Funding Number(s)
PROJECT: RTOP 502-25
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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