VGF 732 Si HC

 

VGF 732 Si HC is a vacuum furnace designed for the directional solidification (based on the Vertical-Gradient-Freeze method) of multi-crystalline solar silicon ingots for photovoltaic wafer production. The new HC–version has an increased capacity of silicon load up to the maximum of 560 kg poly-silicon due to the possibility to use higher crucibles (up to 520 mm). The furnace with its unique temperature control and best temperature homogeneity provides perfect conditions for the optimized crystallization process of these higher ingots to achieve the same quality like the standard size of 420 kg.

  Main Features
  1. Vessel design: stainless steel, bottom loader by electro-mechanical lowering and lifting device
  2. Heating system: three independent adjustable heating zones
  3. Crucible dimensions: max. 883 mm x 883 mm x 520 mm
  4. Ingot dimensions: approx. 834 mm x 834 mm x 340 mm*
  5. Ingot weight: approx. 420-560kg*
  *depending on density of feedstock material and used crucible height
  Other Features
  1. Three independent adjustable heating zones which can shorten the cycle time
  2. Easy maintenance due to vessel lid and access to all parts
  3. Independent controllable heaters for stable crystallization front and low mechanical stress
  4. Unique venting design for reduced carbon incorporation