Cold wall furnace with protective gas atmosphere or vacuum
HTM’s cold wall furnaces are suitable for work in oxygen-free atmospheres at temperatures up to 2400 °C.
Depending on the materials used for the heating conductor and the thermal insulation, different application specific versions are available. By using oxygen getters in the thermal insulation, extremely low-oxygen gas atmospheres or – in a modified version – high vacuum can be achieved. The usual working space volumes range from 0.5 l to 20 l.
The table below provides an overview of the heating systems and their characteristics.
Material of the heating conductor | Material of the thermal insulation | Maximum temperature |
Gas atmosphere |
Mo (molybdenum) | Alumina | 1850 °C | Hydrogen, inert gas (low humidity, carbon-free) |
W (tungsten) | High temperature oxides | 2100 °C | Hydrogen, inert gas (carbon-free) |
W (tungsten) | W/Mo radiation shields | 2400 °C | Inert gas, carbon monoxide |
Graphite | Graphite fiber | 2500 °C | Inert gas, hydrogen (carbon-free and oxygen-free) |
Cold wall furnaces with protective gas atmosphere are used for different processes, such as: