INSULATION STUDIES FOR HIGH POWER TUBES.
Abstract
A feasibility study of insulation materials for application in high power electron tubes was made. Pertinent properties included: low dielectric constant (< 3.0), low dielectric loss (L0.0001), high thermal conductivity (0.5 cal/cm, sec, C). After an extensive literature search, a theoretical study was carried out on the fundamental factors affecting a material's property values. This was extended to include those materials, currently available, which most closely approximate the target values. The approaches to determine the feasibility of developing the desired new material centered around three areas: (1) observation of property value ranges for material classes, (2) analysis of property value trends for families of compounds based on the position of their elements in the Periodic Table, (3) a similar analysis based on the more promising crystal structures as predicted by radius ratios. No new material was found which better approximated the ideal than do BeO and BN. The trends in the data do not give much hope of finding a more ideal new compound. This study concludes that the most feasible approach to a closer approximation of the target values would be the growth and utilization of BN in whisker form. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1970
- Accession Number
- AD0707946
Entities
People
- D. L. Frey
- E. J. Smoke
- H. C. Mcgowan