High temperature vacuum furnace LHTM/W

Vacuum Laboratory Furnaces

APPLICATION EXAMPLES

Quenching, annealing, brazing, carbonisation, ceramic injection moulding (CIM), debinding, degassing, drying, hardening, metal injection moulding (MIM), pyrolysis, rapid prototyping, siliconization, sintering, soldering, sublimation, synthesis, tempering

STANDARD FEATURES

Compact design suited for laboratories
Best possible vacuum
Vacuum level < 5 x 10-6 mbar
Partial pressure 10 – 1000 mbar

Overpressure operation up to 100 bar possible
Hydrogen partial pressure operation on demand
Precisely controlled vacuum pumping speeds appropriate for use with powders
Data recording for quality management

LABORATORY FURNACE, METAL INSULATION (LHTM/W)

TECHNICAL DETAILS

View inside of the LHT laboratory furnace:

Water cooled vessel
Heating elements
Top cover, manually operated
Thermocouple
Radiation shields at the top
Radiation shields at the mantle
Short circuit ring

LHT models are heated by a single mantle heater because of their small volume. The temperature profile inside is better than ± 10 K. This uniformity is achieved through careful engineering and positioning of the heating element.

The LHTM and LHTW are both constructed of metallic materials and 9 radiation shields. It has a single heating zone that covers the mantle of the cylindrical vessel. The mantle heater is designed for the highest stability. Two different heating elements are available. The standard heating elements consists of several molybdenum sheets, and upon request, a mesh heater is also available. The sample can be protected by a retort that further improves temperature uniformity. With the adaption of a high vacuum system, the best final vacuum is available.

Software operation is available with manual or automated controls. For the manual version, all valves and pumps are operated by simple push buttons at the user panel with a rotameter used to adjust gas flow. The automated software is operated via a touch panel interface. Mass flow controllers are used to regulate the gas flow. Data logging is possible for both manual and automated operation.

The small overall dimensions and simple operation result in a cost effective system without any performance loss in temperature uniformity or atmospheric quality. Additionally, the cylindrical design is best suited for overpressure heat treatment processes. Upon request, the system can be equipped with a suitable locking device and all necessary equipment for safe overpressure operations up to 100 bar.

The metallic LHT models are based on heating elements and radiation shields constructed of tungsten or molybdenum for a maximum temperature of 2200 °C and 1600 °C, respectively. The radiation shields serve to insulate the heat of the heating elements from the water cooled vessel. The metallic LHT systems provide the highest possible atmospheric purity and best final vacuum level. With a turbomolecular pump in combination with a pre-pump, the working vacuum can reach the high vacuum region. An ultra high vacuum configuration is possible upon request.