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
|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: