-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
