A COLD HIGH-VACUUM SEAL WITHOUT GASKETS

Technical Report · Sat Sep 01 04:00:00 EDT 1962

OSTI ID:4783235

Mancebo, L

A technique was developed by which the final seal in the vacuum envelope of a device can be made without the use of heat or gaskets, This technique prevents the contamination of sensitive cathode surfaces, oxidation of metal parts near the seal area, and damage to temperature sensitive solid state components. The seal is made between two glass flanges which have been ground optically flat. To effect a seal, the ground flanges are cleaned, placed together, and a vacuum pulled on the envelope. A seal with flanges 4 in. in dia. was made that is still vacuum tight after 11/2 yr. The seal can be baked at any temperature that the components can withstand. The joint is rugged; several test seals were separated only after material was ripped from the mating flanges. The mechanical design is discussed as well as techniques for inspecting for flatness and quality prior to sealing. A method of re-using the same flanges is also presented. (auth)

• Research Organization: California. Univ., Livermore. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-17-000254
• OSTI ID: 4783235
• Report Number(s): UCRL-6978
• Country of Publication: United States
• Language: English

Related Subjects

CATHODES
EFFICIENCY
ENGINEERING AND EQUIPMENT
MECHANICAL STRUCTURES
OXIDATION
SEALS
SEMICONDUCTORS
SENSITIVITY
SURFACES
TEMPERATURE
VACUUM