-X-ray equipment
Typical Construction of QHXN Vacuum
Ceramic Feedthrough Insert
(1) Conductor,
(2) Washer,
(3) Cap,
(4) Insulator,
(5) Sleeve,
(6) Weld Adapter
QHXN ceramic-to-metal feedthroughs use only inorganic
materials. The insulators are made from high-purity,
high-strength, low-loss alumina ceramics. Metals include
stainless steel, nickel, copper, nickel-iron alloys,
cupro-nickel alloys, molybdenum. In designs, standard
design practices consider electrical characteristics such
as flashover, corona breakdown, creep, dielectric strength
and puncture resistance.
Braze materials used are silver, copper, silver-copper or
gold-copper alloys. Metalization processes include both
refractory-metal and active-metal metalizations, depending
on the size, geometry and performance requirements for the
feedthrough. QHXN uses advanced techniques and methods to
control and monitor critical processes, including 100
percent helium leak testing and x-ray measurements for
metalization control.
Standard installation mountings for QHXN ceramic-to-metal
feedthroughs include:
-Brazing
-Welding (pulse-TIG, TIG, laser, E-beam welding)
-ISO KF flange
-ConFlat flange
-NPT fitting
-1" baseplate
1) ceramic tube 97% to 99% high purity alumina and two
ends metalizion thin layer of a molybdenum
2) two end SS307L metal caps
3) OHFC copper rod dia 2 mm
Final feed through will be achieved- Test for final
dielectic strength :2.5K V.
Insulation resistance test will be achieved (1000 V
DC,1 Gigaohm)
leak test - Vacuum leak acceptance range better
than 1X10 -9 mbar-lit/sec of helium MSLD
Required property of ceramic tubes: The ceramic tube
shall conform to the electrical,mechanical,thermal and
general property requirements specified as follows.
Non-Standard
Vacuum Ceramic Feedthrough Insert
