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BEARINGS FOR ULTRA-HIGH VACUUM (UHV) APPLICATIONS: MEETING EXTREME DEMANDS

BEARINGS FOR ULTRA-HIGH VACUUM (UHV) APPLICATIONS: MEETING EXTREME DEMANDS

Date Published: Nov 07, 2024

Ultra-High Vacuum (UHV) environments, essential in particle accelerators, semiconductor manufacturing, and cutting-edge scientific research, require highly specialized components, including bearings that can handle pressures below 1 x 10¯6 torr. These extreme conditions present unique challenges, such as material outgassing, lubrication limitations, and the need for exceptional thermal stability and material compatibility. Bearings used in these settings must meet rigorous standards to ensure reliable performance without contaminating the vacuum environment.

 

Key Challenges in UHV Bearings

 

  1. Material Outgassing: Outgassing—the release of trapped gases from materials—can compromise UHV environments by introducing unwanted particles. Bearings used in UHV systems must minimize outgassing, making material selection critical.
     
  2. Thermal Stability and Compatibility: With high-temperature bake-out processes, often between 200-450ºC, needed to eliminate contaminants, UHV bearings must maintain dimensional stability and withstand intense heat.
     
  3. Lubrication Restrictions: Conventional lubricants evaporate in vacuum conditions, introducing contaminants. UHV bearings often operate with solid lubricants, like molybdenum disulphide (MoS2) or tungsten disulphide (WS2), or without lubrication, relying on ceramic bearings for their low friction, non-magnetic properties, and self-lubricating capability.
     

Precision Materials for UHV Performance

Carter Manufacturing provides specialized UHV bearings from brands like UNASIS, Silverthin, and KMS, often utilizing ceramics or hybrid materials such as stainless steel combined with ceramic balls. Materials like silicon nitride, zirconia, and stainless steel (grades 304 or 316) offer low outgassing rates, high durability, and compatibility with high-temperature environments. Additionally, coatings such as titanium nitride (TiN) or diamond-like carbon (DLC) are sometimes applied to reduce outgassing even further, enhancing material stability.

 

Ensuring Precision and Cleanliness

UHV environments require meticulous cleanliness and precise motion control. Organizations such as CERN, the Max Planck Institutes, and Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) rely on UHV-compatible bearings in particle accelerators, synchrotrons, and other high-tech equipment where even minimal contamination could disrupt results. Similarly, semiconductor manufacturing and surface science applications require precision UHV bearings for success in sensitive processes.

 

Supporting UK’s Research Hub

Located in Oxfordshire, near leading scientific institutions like the UK Atomic Energy Authority and the Rutherford Appleton Laboratory, Carter Manufacturing collaborates closely with scientists and engineers to deliver bearings that exceed UHV performance standards. Through partnerships with top research facilities, Carter supports advancements in spectroscopy, particle physics, materials science, and other pioneering fields.

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