ALLOY SYSTEM FOR BRAZING OF COLUMBIUM AND TUNGSTEN
Abstract
A study was made of the joining of W and Nb alloys be brazing. Nb aloys selected for study were F-48 alloy(Nb-15W-5Mo-1Zr) for service to 2500 F, and Nb-1Zr alloy for service in the 1800 to 2200 F temperature range. High purity, powder metallurgy sheet was used for the W brazing studies. Brazing alloys were designed on the basis of compatibility with Nb and W, and melting temperatures. All brazing alloys were then evaluated for hardness, melting range, wettability and flow, and diffusion reactions with the base metals. Brazed panels were examined both asbrazed and after suitable diffusion treatments. Based on results of this initial evaluation, 4 brazing alloys for use with Nb alloys were selected for further study. These alloys, AS-537(Zr-28V- 16Ti), AS-536(Ti-6Fe-4Cr), AS-501 (Ti-30V), and AS-514V-35Nb), exhibited useful brazed joint strength and had negligible effect on the ductile-to-brittle transition temperature of the base metals. Brazing alloys showing best characteristics for use with unalloyed W were AS-517 (Nb-2.2B) and AS-519 (Nb-20).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1962
- Accession Number
- AD0273693
Entities
People
- W. R. Young
Organizations
- General Electric