GENERATOR DEVELOPMENT, SPUR PROGRAM. PART II. GENERATOR STATOR BORE-SEAL.
Abstract
The tubular ceramic-metal 'bore-seal' for protection of electrical windings in the stator of the hermetically sealed alkali-metal Rankine cycle SNAP-50/SPUR electric turbogenerator must have a life of more than 10,000-hours in potassium vapor at a temperature of 900 F. A preceding report, ASD-TDR-63-677, Part I, gave the results of early developments and short-time testing of materials. This Part II of the report describes the effect of long-time potassium exposure and the initial trials in brazing 11.5-inch diameter tubular specimens. Testing demonstrated that several brazement combinations with 99-percent alumina and 99Cb/1Zr alloy members can resist potassium vapor attack for the required 10,000-hour service time at 900 F. However, the 75Zr/19Cb/6Be brazing alloy produced strong potassium resistant joints and also gave the best results in producing vacuum-tight ceramic-metal joints with the slow brazing cycles needed for fabrication of large assemblies.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1967
- Accession Number
- AD0810272
Entities
People
- John G. Hoop
Organizations
- Westinghouse Electric Corporation