Accession Number : ADD000378

Title :   Vacuum Brazing Tantalum Alloys.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Rupert,Edward J ; Meyer,Monroe W ; Uhland,Gerald E

Report Date : 12 Nov 1974

Pagination or Media Count : 9

Abstract : The patent describes a process for fabricating a structure by vacuum brazing tantalum alloy elements in which a columbium-vanadium brazing foil is placed between surfaces of the elements to be joined. A coating of yttria powder is applied to surfaces of elements that will be in contact with a tungsten hearth plate and tungsten pellets; the structure is positioned on the tungsten hearth plate in a vacuum heating zone with tungsten pellets disposed on top of the portion of the upper element to be joined so as to exert pressure thereon and control the gap between the surfaces to be joined; the elements are heated in the vacuum heating zone to a temperature sufficient to melt the brazing foil. The vacuuum brazing process is particularly suitable for use in fabricating honeycomb sandwich panels, using tantalum alloy structural elements.

Descriptors :   *Tantalum alloys, *Brazing, *Patents, Niobium alloys, Vanadium alloys, Yttrium oxides, Tungsten, Vacuum, Honeycomb structures, Sandwich panels

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE