BRAZING BERYLLIUM BY CAPILLARY FLOW.
Abstract
Silver-base braze alloys were developed for beryllium to give maximum capillary flow with high tolerance for minor changes in braze conditions. Based on studies of binary systems, alloys containing copper were selected and optimized with up to six components. Argon brazing was found to be superior to vacuum and hydrogen brazing. Steps in evaluation procedures included: flow on flat beryllium sheet; capillary flow over a vertical distance of one inch during heating; vertical capillary flow at selected temperatures versus time; structure; strength and stability of brazed joint. Four silver-base alloys showing improved flow were developed for brazing at 1550 F to 1700 F. Three flow at 1550 F and one at 1650 F. The upper temperature alloy was included for high temperature applications of beryllium. Titanium and beryllium-base alloys were also investigated. It was shown that titanium-base braze alloys gave better wetting than any silver-base alloy with excellent tolerance for changes in braze conditions. Optimization of titanium-base braze alloys was not possible on this program. Beryllium-base braze alloys were not promising and were discontinued early in the program.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1967
- Accession Number
- AD0807626
Entities
People
- A. G. Metcalfe
- R. G. Bogowitz