Accession Number : AD0274616

Title :   DEVELOPMENT OF LOW TEMPERATURE BRAZING OF TUNGSTEN FOR HIGH TEMPERATURE SERVICE

Corporate Author : SOLAR SAN DIEGO CALIF

Personal Author(s) : HAYNES,C.W.

Report Date : 26 MAR 1962

Pagination or Media Count : 1

Abstract : The Pt-B reactive braze system for the lowtemperature brazing of W for high-temperature service was investigated. Alloys ranging in composition from Pt-1.0B to Pt-4.5B were prepared and used for brazing lap shear specimens of tungsten sheet material. Specimens were tested by heating until separation occurred while loaded to a shear stress on the joint of 20 to 800 psi. The effects of B content of the alloy, amount of W powder addition to the joint, and diffusion treatments after brazing were determined. Optimum joint thickness was defined and limits for satisfactory joints established. The factor limiting the maximum temperature capability of the system was determined to be the tungsten boride formed in the reactive process. Various modifications of the basic Pt-B alloy were investigated; certain halide additions to the joint showed the most promise for raising the maximum temperature capability. (Author)

Descriptors :   *BRAZING, *TUNGSTEN, ADDITIVES, BORIDES, BORON ALLOYS, CHEMICAL REACTIONS, DIFFUSION, FOILS(MATERIALS), HALIDES, METAL JOINTS, PLATINUM ALLOYS, POWDER ALLOYS, POWDER METALS, REFRACTORY MATERIALS, SILVER SOLDERS, SOLDERING ALLOYS, THICKNESS, TITANIUM, TUNGSTEN COMPOUNDS, WELDS, ZIRCONIUM

Distribution Statement : APPROVED FOR PUBLIC RELEASE