Ceramic vacuum tight bushings are generaly employed for the transmission of electric signals into vacuum sealed cavities.

They are applied in various instuments and devices for example in following fields:

Vacuum Technics and Electronics
vacuum pumps, power tubes, vacuum gauges

Electron Optics
mass spectrograf, electron microscope

X-ray and Nuclear Technics
X-ray convertors, spectrum analysers, epitax molecular beam sources, hydrogen ion sources, neutron beam sources, vacuum welding cameras

Measurement Technics
thermocell probes, Langmuir diodes, plasma diagnostics

The bushings are composed of low-loss corundum ceramics, metal flanges and pins. The ceramic is connected to a flange made exclusively of special metal alloys, whose thickness is 0,3 to 0,5 mm as a rule. The pins of different size or shape can be also made of thermocell materials.

The bushing is vacuum tight at inner pressure down to 10-8 - 10-9 Pa and temperature up to 600 °C (or 900 °C when copper brazed).

 

ENGINE Voltage   Current 5951 6270.1 4254 6871 5954 6270.2 6871 6 5,5 10   kV 200 50 400   mA 4254 6270 XV-046-014 18 10   V 30 50   A 4138 2880.0 5617 6280.1 4244 6070.2 4237 2870.11                 10 160 500     1000            V     5 1 20      100       A mA A     mA