Vacuum furnaces

PVA-LWT uses modern, high-performance vacuum furnaces of different size and arrangement. Principally two different types of vacuum heat-treatment furnaces can be distinguished:

• MOV-furnaces:
  MOV-furnaces are fully metal heated furnaces. This means that the heating insert is made of metals, normally tungsten or molybdenum. Main characteristic for this furnace type is a very pure high-vacuum atmosphere, which is nearly free of any carbon-hydrogens. This enables heat-treatment of very sensitive materials, such as refractory metals. MOV-furnaces are typically used for brazing and heat-treatment of tantalum, titanium, niobium and ceramic materials.
  
  
• COV-furnaces:
  The heating insert of a COV-furnace, consisting of the insulation and the heating elements, is made of graphite. These furnaces are generally equipped with a high-vacuum diffusion pumping unit. In contrast to MOV-furnaces the COV-furnaces are more robust but do not dispose of carbon-hydrogen free vacuum atmosphere. Therefore COV furnaces are generally used for hardening processes and brazing of copper alloys and stainless steels.
  

All furnaces at PVA-LWT are numerically controlled and fulfil highest requirements with regard to reproducibility of brazing processes and documentation of process data. As PVA-LWT is fully embedded in the PVA TePla group, we have short time access to spare parts and service technicians and thus can assure a maximum availability of our production furnaces.


Our furnace equipment:

• MOV 923 T
  Capacity: 800x700x1100 mm³ (WxHxL)
  Max. operating temperature: 1250°C
  Vacuum: max. 1*10-⁵ mbar

• MOV 353 T
  Capacity: 250x250x620 mm³ (WxHxL)
  Max. operating temperature: 1550°C
  Vacuum: max. 1*10-⁶ mbar

• COV 633 Dif
  Capacity: 350x600x600 mm³ (WxHxL)
  Max. operating temperature: 1100°C
  Vacuum: max. 1*10-⁵ mbar

• COV 823 Dif
  Capacity: 800x800x1800 mm³ (WxHxL)
  Max. operating temperature: 1350°C
  Vacuum: max. 1*10-⁵ mbar

• MOV 843 CL
  Capacity: 700x700x1500 mm³ (WxHxL)
  Max. operating temperature: 1350°C
  Vacuum: max. 1*10-⁶ mbar

• COV 923 Dif
  Capacity: 800x1000x1900 mm³ (WxHxL)
  Max. operating temperature: 1350 °C
  Vacuum: max. 5*10-⁶ mbar

• COV 843 Dif
  Capacity: 800x800x1800 mm³ (WxHxL)
  Max. operating temperature: 1350 °C
  Vacuum: max. 1*10-⁵ mbar

• COD 264
  Capacity: 240x265 mm³ (DxH)
  Max. operating temperature: 1700 °C
  Vacuum: max. 1*10-² mbar

  Max. Pressure: 100 bar
  

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