NRL Engineering Materials and Chemistry Divisions Studies of the A2 Tube Failure.
NAVAL RESEARCH LAB WASHINGTON D C
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This report discusses the hypotehsis and supporting evidence concerning the probable major failure mode of A2 microwave tubes. Such failure occurrred due to loss of adequate vacuum. It was hypothesized that cracking due to tube wall Al2O3-metal electrode stresses could cause cracks to connect pores in the Al2O3 to the tube interior and thus vent gas in the pores left from processing into the tube. Calculations, microstructure, and fractographic evidence from this program are reported supporting this pore mechanism. Supporting pore-outgassing, stress cracking and acoustic emission evidence from other studies is also noted. Limited tensile test trials of the tubes are also reported. Author
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