Aluminum to Stainless Steel Transitions

Aluminum to Stainless Steel Transitions

EBARA's new Aluminum to Stainless Steel Transitions provide a reliable UHV seal for aluminum vacuum systems. An explosion bonded composite of aluminum, stainless steel and two other UHV materials make these transitions leak tight at UHV pressures. Transitions are welded to a stainless steel CF flange as a complete unit ready to weld to your aluminum chamber or beamline, or the transition can be purchased separately for welding to your own CF flange.

The explosion bonds have been tested for tensile, shear and thermal stress. Testing included thermal quenching from 773÷K to 77°K. This process has shown vacuum integrity to better than 5 x 10-10 standard cc per second with wall thickness as thin as 0.025". Each unit is thermally cycled to 300°C. Helium leak testing is done before and after thermal cycling.

Specifications

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CF Aluminum to Stainless Steel Transitions

SPECIFICATIONS
General: Rotatable or nonrotatable flanges with tapped or clearance bolt holes
Nominal OD sizes: 1-1/3 to 16-1/2 inches
Tube sizes: 1/4 to 14 inches
Materials
   Flange: 304 stainless steel (316L available on request)
   Gaskets: Viton, copper or silver plated
   Bolts: 18-8 stainless steel or silver plated
Vacuum range: 
   Metal seal: >= 1 x 10-13 Torr - UHV
   Elastomer seal: >= 1 x 10-8 Torr - High vacuum
Temperature range: 
   Metal seal: -200°C to 450°C 
   Elastomer seal: -20°C to 150°C 

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Additional Information

MODEL NUMBER DESCRIPTION A B C D E
ALST-075-CF Nonrotatable CF 1.33 0.50 0.750 2.20 1.00
ALST-075 Transition only - 0.50 0.750 - 1.00
ALST-150-CF Nonrotatable CF 2.73 1.25 1.500 1.91 1.75
ALST-150 Transition only - 1.25 1.500 - 1.75
ALST-250-CF Nonrotatable CF 4.47 2.25 2.500 2.08 2.75
ALST-250 Transition only - 2.25 2.500 - 2.75
ALST-400-CF Nonrotatable CF 5.97 3.75 4.000 2.14 4.25
ALST-400 Transition only - 3.75 4.000 - 4.25
ALST-600-CF Nonrotatable CF 7.97 5.75 6.000 2.20 6.25
ALST-600 Transition only - 5.75 6.000 - 6.25
ALST-800-CF Nonrotatable CF 9.97 7.75 8.000 2.20 8.25
ALST-800 Transition only - 7.75 8.000 - 8.25