NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Apparatus ad method for quiescent containerless processing of high temperature metals and alloys in low gravityThe electron bombardment furnace consists of two confinement grid sections which may be moved and separated from each other. Inside the bombardment furnace, a tungsten element is enclosed. The material specimen is located within the tungsten element and grounded by means of grounded support wires connected to the respective sections of the furnace. The material specimen is supported on the ground wires and heated by electron bombardment until melt occurs. The furnace sections are separated in opposite directions causing the ground wires to pull from the surfaces of the specimen, leaving the specimen freely suspended in the process chamber without the action of external forces. The specimen remains in its melt condition in the processing chamber where it can be undercooled without external forces acting on the specimen, which would cause dynamic nucleation.
Document ID
19870014511
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Robinson, Michael B. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Lacy, Lewis L. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 13, 2013
Publication Date
June 30, 1987
Subject Category
Instrumentation And Photography
Accession Number
87N23944
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-MFS-28087-1|US-PATENT-4,677,642
Patent Application
US-PATENT-APPL-SN-805010

Related Records

IDRelationTitleN86-23899Superseded By
No Preview Available