DEVELOPMENT OF LOW TEMPERATURE BRAZING OF TUNGSTEN FOR HIGH TEMPERATURE SERVICE
Abstract
The platinum-alloy reactive braze s stem (PtB-W) is being investigated to: (1) studythe effect of B content, (2) study the effect of mode of W addition, (3) develop diffusion treatment, (4) determine optimum joint thickness, an (5 0 develop alloys based on information derived from preceding studies. Preliminary tests on Pt-2 to 6 5b indicate that the maximum usable B content is about 4.5%. The Pt-3.6B alloy was used in studying the effect of the mode of W addition. The particle size of the W powder is not critical for sizes below 74 microns for heating rates in the 25 to 200 F/min range; the amount of W powder reactant added is critical. Study on diffusion treatments is dependent on the B and W studies, however, preliminary work on recrystallization cycles was begun with 0.020in.-gage W sheet samples heated at various temperatures and times in an inert atmosphere. Four cycles were completed: (1) 2300 F, 10 min, (2) 2400 F, ! MIN, (3) 2400 F, 10 min, an (4) 2500 F, 1 min. None of these cycles resulted in serious recrystallization although the latter 2 appeared to be in the beginning stages.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 23, 1961
- Accession Number
- AD0260580
Entities
People
- A.g. Metcalfe
- C.w. Haynes