2026-07-20 Original Article
The operation of etching equipment involves high-speed rotation and high vacuum retention. These conditions generate significant heat at the point where a rotating shaft enters the vacuum chamber. A magnetic fluid rotary feedthrough provides the necessary seal, but its performance can degrade if that heat is not controlled. This is where water cooling becomes a direct engineering consideration. According to one manufacturer's history, magnetic fluid seals were designed for use under demanding conditions including high-speed rotation, high vacuum retention and water cooling. The integration of cooling directly addresses thermal load, a persistent challenge in these systems.
The technology has a long history in precision manufacturing. The commercial origin of magnetic fluid feedthroughs dates back to 1952 with the development of a rotating anode X-ray generator. Production of dedicated magnetic fluid seals began later, in 1978, for use in X-ray diffractometers. The accumulated experience from these early applications laid the groundwork for their use in more modern industrial processes. Today, vacuum seals which use ferrofluid to enable transmission of rotational movement are used in the manufacturing process of semiconductors, flat panel displays, LED, and solar cells. They are employed mainly in the etching and deposition processes of semiconductor fabrication.