Titan CF™ bimetallic flanges—the aluminum flange with a stainless steel knife-edge seal, makes UHV titanium vacuum systems a reality.

Titan CF™ Flange Features

  • Patented UHV aluminum to stainless explosion welding technology (EXW) that is only available from Atlas
  • UHV Rated to 1x10-13+ Torr
  • 1/2 the weight of stainless flanges
  • 90° included angle, long-life knife-edge design, developed at CERN
  • 100% Compatible with the industry standard ConFlat® interface. Reduced stainless steel, Cryogenic, non-magnetic, rectangular and other specialty flange solutions also available


Titan CF™ Flanges are fully compatible with the industry standard ConFlat®  flange. Atlas uses CERN’s 20° back-bevel knife-edge design with a long-life 90° encompassed angle geometry. Atlas flanges are quality controlled using material batch monitoring processes.


Body/Weld Interface: CP Grad ll

Knife-Edge: Stainless Steel 316L


Vacuum Leak Tested: < 1x10E-9 cc/sec of He


Peak Temperature: 450°C (during weld-up)

Operational Temperature: 400°C


Titanium CF™ Flange All-Metal Sealing for Titanium Vacuum

The titanium flange with the stainless steel knife-edge seal used for joining titanium chambers to conventional stainless steel flanges

back bevel on knife edge improves seal by making it more tolerant to thermal cycles as well as enhancing its durability

Figure 1: 20 degree back bevel on knife edge improves seal by making it more tolerant to thermal cycles as well as enhancing its durability.

The Titan CF™ Flange combines the time-tested reliability of the stainless steel ConFlat® (CF) knife edge, with a titanium flange body for weld up to an titanium chamber. 


The Titan CF Flange provides standard all-metal-sealing for titanium vacuum chambers. It enables vacuum engineers and designers to fully utilize the exceptional high and ultra high vacuum properties of titanium.

Using proprietary and state-of-the-art explosion welding technology, our stainless to titanium bimetallic flanges are fully compatible with the industry standard ConFlat® flange interface. Employing CERN’s innovative 20° back-bevel (90° included angle) knife-edge design, the Titan CF™ Flange provides a longer service life than conventional CF flanges.

Titan CF™ Flanges are suitable for service in vacuum levels to 1x10-13+ Torr and 450°C bakeout temperatures. Our bimetallic flanges can be easily welded to titanium vacuum vessels and are the key to successful integration of aluminum UHV technology in your application.

Our flanges are used in prominent high (HV), ultrahigh (UHV) and extreme high vacuum (XHV) applications around the world. They find extensive use with semiconductor fabrication OEMs where superior heat conduction, chemical resistance, manufacturing ease and the lower cost of aluminum vacuum systems translate into measurable productivity and cost of ownership advantages.


Application Specific Models:

Non-Magnetic Titan CF™ Flanges: Because titanium is essentially non magnetic Atlas manufactures a large number of vacuum chambers and flanges for low magnetic permeability applications. Atlas offers a line of Titan flanges made with a 316LN face instead of a 316L face. 316LN has a significantly lower magnetic permeability than standard stainless steel. For completely non-magnetic applications, all titanium flanges are also available.

Typical non magnetic uses are UHV synchrotron and particle physics and industrial applications, where high magnetic permeability is detrimental to beam quality or experimental results. Such applications include non-magnetic beam tubes, wigglers, undulators, free electron lasers, drift tubes, spectrometers...

Light/Low Weight Atlas CF Flanges: For weight sensitive applications such as Aeronautical, Space or portable systems Atlas offers either a reduced thickness of stainless or titanium faced or a line of Titan CF flanges. Using these models, engineers can significantly reduce overall weight. Depending on size, reduced stainless flanges are produced with a stainless interface that's about 20% to 40% thinner than standard flanges. Contact our sales department for more information on our custom bimetallic, high and ultrahigh vacuum solutions.

Explosion Welding/Explosion Bonding: Robust bimetallic joints for dissimilar metals

Atlas Technologies concentrates much effort in the development of methods and processes specifically intended for bonding dissimilar metals for use in ultrahigh vacuum (UHV) scientific and industrial applications. Atlas holds various patents in this technology, including those for the Titan CF™ flange.

Explosion welding or bonding (EXW) is a solid state process by which dissimilar metals can be joined together at an atomic level. The bonds are very strong, fully metallurgical and ductile. Preparation for bonding requires that plates lay flat to each other, a flyer plate on top of a base plate separated by a small gap. An explosive charge is placed on the flyer plate and detonated from a point at the edge of the plate. A controlled progressive ignition travels across the flyer plate like ripples in a pond. The explosion accelerates the plates together with impact velocities of 1800~2200 m/sec. A high energy surface plasma is formed between the plates, moving ahead of the collision point and stripping electrons from the two bonding surfaces. The electron-hungry metals are then thrust together at extreme pressures forming an electron-sharing bond. Metals like copper and stainless steel can be readily bonded through the EXW process. However titanium and stainless are metallurgically incompatible and not be directly bonded, because of the formation of brittle intermetallic compounds. Atlas has developed patented multi-layer composites technologies that provide the metallurgical compatibility required for joining titanium to stainless and other exotic metals.

ConFlat® is a trademark of the Varian Corporation.

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