Mechanical reliability of current alumina and beryllia ceramics used in microwave windows for gyrotrons

Technical Report · Tue Feb 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/6521358· OSTI ID:6521358

Becher, P. F.; Ferber, M. K.

The mechanical reliability was evaluated for the alumina and beryllia ceramics now used as microwave windows in the high-power (greater than or equal to 200 kW) high-frequency (greater than or equal to 60 GHz) gyrotron tubes being developed for plasma heating in fusion systems. Analysis of the stresses generated in the various window configurations and tube operating conditions indicated that significant tensile stresses are generated in the ceramic window by dielectric heating. As a result, we characterized the static and dynamic fatigue behavior and the inert strength distributions for these two ceramics (i.e., fatigue studies included the behavior in the fluorocarbon fluid used for window cooling at 22 and 48/sup 0/C and in both air (65% relative humidity) and distilled water at 22/sup 0/C. These data were then analyzed in order to construct reliability diagrams for these materials.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6521358
• Report Number(s): ORNL/TM-8555; ON: DE83006360
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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Heating
& Injection Systems
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMPLIFIERS
BERYLLIUM COMPOUNDS
BERYLLIUM OXIDES
CERAMICS
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
MICROWAVE RADIATION
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
RADIATIONS
STRESSES
TESTING
WINDOWS