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Crystal- and Zone Pulling

Optimum structures with long-time stable generators

The artificial creation of crystals is vital to many industries. They are created by using of one these three processes: zone floating or zone melting, vertical pulling (Bridgman Stockbarger Procedure) or crucible pulling (Czochralski Process). Zone floating permits the creation of ultra-pure single crystals. For this reason, this process has prevailed over the Czochralski pulling process, particularly in semiconductor production.

Zone Floating Process

Zone Floating Process

During the zone floating process, a vertical polycrystalline bar is melted on one end. The small, melted area is permitted to move slowly from one end of the bar to the other end. Monocrystalline silicon is created during solidification. The major advantage of this process: Impurities accumulate in the melted area and can be flushed out of the crystal.

Vertical Pulling Process (Bridgman Stockbarger Process)

During the vertical pulling process (Bridgman Stockbarger Process), the polycrystalline base material is heated in a closed crucible and then cooled slowly in small amounts. A graphite susceptor is used to transfer the heat. The crystal cools and hardens when the crucible is removed out of the high frequency field. As an alternative, this can be achieved by reducing the generator's power. The Bridgman-Stockbarger-method was developed mainly to produce semiconductors, but it is also used to produce alkaline halide and fluoride crystals. 

Kristall gezüchtet nach dem Czochralski -Verfahren

Crucible Pulling Process (Czochralski Process)

In the case of the crucible pulling process (Czochralski process), the material to be processed is first melted in a crucible. A single crystalline seed crystal is brought close to the surface of the bath and then into contact with it. As a result of capillary action, the liquid rises up along the seed crystal, forms a meniscus and creates a triple liquid - solid - gas boundary layer.
The seed crystal is then pulled up slowly to the top to form a single crystal. Its growth is achieved by keeping the crystal rotating, so that the bath is homogenized and the shape of the boundary layer of solid material and liquid is kept under control.

Products

HF-Generator zur Induktionserwärmung
TruHeat HF Series 1000 / 3000 / 5000

High power, compact format

HF-Generator TruHeat HF 7010
TruHeat HF Series 7000

High performance generator with proven tube technology

Leistungsstarker Induktionsgenerator: TruHeat MF 5040
TruHeat MF Series 3000 / 5000 / 7000

Precise power for unbeatable heating efficiency

Mittelfrequenzgenerator der TruHeat MF Serie 7000 (G2) für induktive Erwärmung
TruHeat MF Series 7000 (G2)

The combination makes it unique

Contact

Nikolas Hunzinger
Induction Sales
E-mail
Service & contact