CERAMIC-METAL SEALS FOR HIGH-POWER TUBES
Abstract
IT WAS ILLUSTRATED THAT A STATISTICAL APPROACH, BASED ON AN ANALYSIS OF VARIANCE OF BASIC FACTORIAL DESIGN, CAN BE APPLIED TO A SYSTEMATIC STUDY OF THE PARAMETERS EFFECTING THE RELIABILITY OF CERAMIC-TO-METAL SEALS. An experiment has shown that 2 types of nickel plating used on 2 types of ceramic, at 2 different thicknesses, will yield no significant difference in seal strength. It was concluded that economy considerations should govern the type and thickness of plating used on metallized ceramics. Axial alignment of the ceramic test specimen was shown to be of major importance in obtaining reproducible tensile test data on ceramic-to-metal seal strength. Two methods were found useful in the detection of leak paths in ceramic-metal assemblies. The first is the deposition of carbonaceous material by the decomposition of a hydrocarbon impregnated in the leak. The second is the deposition of metal in the leak path from a gaseous phase. It is concluded that both methods can be applied to a metallographic examination technique which will allow a categorizing of leak paths. A non-pumping, cold cathode ionization gage for use as a life test vehicle is described and is being fabricated for testing. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1961
- Accession Number
- AD0275082
Entities
People
- A. S. Ferello
- K. H. Styhr
Organizations
- Rome Laboratory