Nabertherm High-Temperature Vacuum Furnaces in Furnaces, Ovens

Nabertherm High-Temperature Vacuum Furnaces
Cold-Wall Retort Furnaces up to 2200 °C

The compact retort furnaces of the VHT product line are available as electrically heated chamber furnaces with graphite, molybdenum, tungsten or MoSi₂ heating. A wide variety of heating designs as well as a complete range of accessories provide for optimal retort furnace configurations even for sophisticated applications.

The vacuum-tight retort allows heat treatment processes either in protective and reaction gas atmospheres or in a vacuum, subject to the individual furnace specs to 10^-5 mbar. The basic furnace is suited for operation with non-flammable protective or reactive gases or under vacuum.


Alternative Heating Specifications
In general the following variants are available wit respect to the process requirements:

VHT ../..-GR with Graphite Insulation and Heating

• Suitable for processes under protective and reaction gases or under vacuum
• Tmax 1800 °C or 2200 °C (2400 °C as additional equipment)
• Max. vacuum up to 10^-4 mbar depending on pump type used
• Graphite felt insulation

VHT ../..-MO or VHT ../..-W with Molybdenum or Tungsten Heating

• Suitable for high-purity processes under protective and reaction gases or under high vacuum
• Tmax 1200 °C, 1600 °C or 1800 °C
• Max. vacuum up to 10^-5 mbar depending on pump type used
• Insulation made of molybdenum rsp. tungsten radiation sheets

VHT ../..-KE with Fiber Insulation and Heating through Molybdenum Disilicide Heating Elements

• Suitable for processes under protective and reaction gases, in air or under vacuum
• Tmax 1800 °C
• Max. vacuum up to 10^-2 mbar (up to 1300 °C) depending on pump type
• Insulation made of high purity aluminum oxide fiber

Basic version

• Standard furnace sizes 8 - 500 liters
• A water-cooled stainless steel process reactor sealed with temperature-resistant o-rings
• Frame made of stable steel profiles, easy to service due to easily removable stainless steel panels
• Housing of the VHT 8 model on castors for easy repositioning of furnace
• Cooling water manifold with manual stopcocks in supply and return lines, automatic flowmeter monitoring, openloop cooling water system
• Adjustable cooling water circuits with flowmeter and temperature indicator and overtemperature fuses
• Switchgear and controller integrated in furnace housing
• H 700 process control with clearly laid out 7'' touchpanel control for program entry and display, 10 programs each with 20 segments
• Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2
• Manual operation of the process gas and vacuum functions
• Manual gas supply for one process gas (N₂ , Ar or non-flammable forming gas) with adjustable flow
• Bypass with manual valve for rapid filling or flooding of furnace chamber
• Manual gas outlet with overflow valve (20 mbar relative) for over-pressure operation
• Single-stage rotary vane pump with ball valve for pre-evacuating and heat treatment in a rough vacuum to 5 mbar
• Pressure gauge for visual pressure monitoring
• Defined application within the constraints of the operating instructions
• NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Controller: H 700

Information: Additional equipment on request please