Bimetallic – CF – Flanges

for UHV Aluminum vacuum systems

Princeton Scientific can provide Aluminum chambers with inhouse developed Bi-metal-flanges. Different material combinations are available.

Bi-Metal-flanges are also available as semi-finished products.

Specification

These flanges are fully compatible with industry standard CF – Flanges. The combination of these two materials allow for welding on Aluminum vacuum chambers and features stainless steel knife‐edge. Aluminum is becoming more popular in the vacuum branche: Very low outgassing rate, non magnetic and high material removing by machining. These material properties in combination with the stainless steel CF – contour creates a reliable solution for every vacuum requirement.

Material

The vacuum‐proof connection between Aluminum and stainless steel is realized by a special kind of pressure welding. Following alloy combinations are possible:

Aluminium:	EN AW 5754
Stainless Steel:	1.4301, 1.4404, 1.4429 ESU

 

Helium Leak Test

Q < 1 x 10−9 mbar l/s

 

Thermal

max. bakeout temperature:	+250 °C
min. operational temperature:	-196 °C

 

Mechanical

Bending‐Test butt joint	170° without cracks
Tensile‐Test butt joint	Material failure in aluminum

Physical

Permeability joint

1, 005