Meeting the demands of vacuum coating systems
Vacuum coating equipment requires reliable rotary motion feedthroughs that operate under extreme conditions. The media feed-through of a vacuum lacks the cooling effect that other media provide, which normally protects sealing elements from overheating and wear. This makes sealing preload and pressure ratios a particular design challenge. Hollow axle magnetic fluid feedthroughs provide a practical solution, offering hermetic sealing often to 10⁻⁸ Torr or better. This protects sensitive thin-film processes from atmospheric contamination.
Key performance parameters for industrial use
Field data from product specifications defines the operational envelope. Models are available with hollow shaft diameters from 10 to 75 millimeters. Rotational speeds can reach 5,800 RPM for some configurations, while others rated for higher temperatures operate at around 3,000 RPM. Temperature specifications typically range from 80 to 100 degrees Celsius for standard high-vacuum models, with high-temperature variants handling up to 200 degrees Celsius. These feedthroughs must maintain a high vacuum, with specifications listing compatibility down to 10⁻⁶ Torr or 10⁻⁶ Pa.
Application-specific design requirements
In semiconductor fabrication, these components support rotary motion for wafer stages and beam steering without introducing particles or vapors. Optical coating lines use large-diameter hollow shafts for handling substrates like fiber optic filters. For flat panel display production, the feedthroughs are integral to web coater rollers and transport systems. The hollow shaft design allows for cable routing and integration with vacuum robotics, adding functional flexibility. Dimensional inspection occurs after each individual manufacturing step during production, with components that do not meet drawing specifications immediately rejected or reworked.
Avoiding failure in critical processes
The non-contaminating, zero-leakage operation is mandatory for coating quality. A failure can introduce hydrocarbons or particles, ruining a deposition run. Selecting the correct model involves balancing shaft diameter, required RPM, and process temperature. The magnetic fluid itself must remain stable under the system's vacuum level and thermal load. Final product inspection includes checking for surface defects and proper assembly to prevent these failures. We provide these specialized feedthroughs and related sealing solutions for advanced manufacturing.