Heating materials used in vacuum furnaces:
The heating elements of vacuum furnaces are divided into metals and nonmetals.
1. Metal heating elements are usually divided into two types: one is precious metals, such as molybdenum, platinum, tungsten, tantalum, etc., and the other is general metals, such as nickel-chromium heat-resistant alloy, iron-chromium aluminum alloy, molybdenum-tungsten alloy, etc.
2. non-metallic heating elements include two kinds of graphite and compound. The compounds are silicon carbide, molybdenum silicide, molybdenum oxide two and so on. Silicon carbide is easy to bond and decompose at high temperature, while two molybdenum oxide softens at 1300 degrees. Only graphite has the characteristics of good machinability, high temperature resistance, good resistance to quench and heat, good plasticity, large radiation area, good resistance to thermal shock and so on, so it is suitable for making heating elements.