silicon crystal grower sealing, ferrofluid feed through

Hollow Spindle Sealing Feed-throughs

Model No.      Bearing         Hollow Spindle Diameter

HTZ010NG      6003            10mm

HTZ020NG      6906            20mm

HTZ025NG      6907            25mm

HTZ030NG      6908            30mm

HTZ040NG      6810            40mm

HTZ050NG      6912            50mm

HTZ075NG      6918            75mm

Intorudction of magnetic fluid/ferrofluid                                                                            

Magnetic fluid is an unusual fluid in that it is attracted to a magnet. In the 1960s, NASA developed the magnetic fluid as part of its space programs. Magnetic fluid has three ingredients: ferromagnetic particles such as magnetite and composite ferrite, surfactant, and a base liquid such as water or oil.
The surfactant coats the 10 nm-dia ferromagnetic particles to avoid coagulation and keep them stably dispersed in the base liquid, forming a ferromagnetic fluid. Its dispersibility also remains stable in high magnetic fields.

This photo shows a phenomenon called 'spiking' that occurs when magnetic fluid is placed in a container and a magnet is brought under the container. Magnetic force acting on the surface of the magnetic fluid produces 'spikes', that look like large nails sticking out of the surface.

     Vapor pressure - temperature characteristics                             Vi scosity - temperature characteristics

Magnetic fluid/ferrofluid feedthrougs                                                                                

Fluid Sealing feed-throughs have been widely used in sealing various vacuum equipments, like, vacuum furnace, sinter furnace, brazier, hardening furnace, heat-treating furnace, monocrystalline silicon furnace, vacuum pump, film-coating machine, chemical gas deposit equipment, ion beam etching machine, molecular pump, ultrahigh-speed centrifugal machine and so on.

Some feedthroughs produced:                                                                                            

Applications                                                                                                                         

Silicon grower:

An example of an ultra-high vacuum system with the magnetic rotary seal

We can design special magntice fluid sealing feedthroughs as per customers' equipment requirements.