Accession Number : AD0630700

Title :   INVESTIGATION OF BRAZING TECHNIQUES FOR FERRIMAGNETIC MATERIALS.

Descriptive Note : Final rept. 15 Jun-15 Dec 65,

Corporate Author : SPERRY ELECTRONIC TUBE DIV SPERRY RAND CORP GAINESVILLE FLA

Personal Author(s) : Buck,Robert W. ; White,John M. ; Tentarelli,Louis A.

Report Date : JAN 1966

Pagination or Media Count : 77

Abstract : The following two vapor deposition metalizing techniques were developed for metalizing ferrimagnetic materials: (1) Evaporating approximately 6000 Angstrom units of iron, (2) Sputtering approximately 5000 Angstrom units of nickel. It was advantageous to electrodeposit about 0.0001 inch nickel on the vapor deposited films. Nickel ferrite and yttrium iron garnet toroids were fabricated and brazed to Kovar, copper and titanium mating members using a vacuum brazing furnace equipped with an induction coil. The parts to be brazed were placed inside a box-like nickel container which, in turn, was placed in the induction coil. Incusil 15 and copper-silver eutectic braze alloys were used. Relatively strain-free brazes were made between ferrimagnetic materials and both copper and titanium. Strain could not be eliminated when brazing to Kovar. No significant changes in either saturation magnetism or linewidth as a result of the brazing operation were observed. An increase in dielectric loss tangent was observed when nickel ferrite was metalized with evaporated iron. No changes in dielectric loss tangent were observed when sputtered nickel films were used as metalizing. (Author)

Descriptors :   (*VAPOR PLATING, SOLID STATE PHYSICS), (*BRAZING, *SOLID STATE PHYSICS), EVAPORATION, SPUTTERING, IRON, NICKEL, FERRITES, YTTRIUM, GARNET, MAGNETIC PROPERTIES, DIELECTRIC PROPERTIES, ELECTRODEPOSITION

Subject Categories : Fabrication Metallurgy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE