In short
Tungsten has the highest melting point of any metal, about 3,422 °C, so it is used for heaters and trays in high-temperature furnaces. It must be used in vacuum, hydrogen or inert gas, because it oxidises in air at high temperature.
Tungsten mesh heaterWhy tungsten for furnace parts
- Very high melting point, far above most other metals.
- Strength at temperature, so parts hold their shape when hot.
- Low vapour pressure, which suits vacuum furnaces.
Mesh heaters and trays
A tungsten mesh heater is made from woven or formed tungsten wire or mesh and gives even heat in a furnace hot zone. A tungsten tray holds material, such as parts or powders, during high-temperature processing. Both are made to the furnace size and drawing.
Conditions for a long life
- Use in vacuum, hydrogen or an inert gas. In air, tungsten oxidises quickly at high temperature.
- Tungsten becomes brittle after use at high temperature, so handle used parts with care.
- Match the design to the furnace power supply and hot zone.
Molybdenum is also used for furnace parts at somewhat lower temperatures. See molybdenum vs tungsten.
What to send
- Drawing or dimensions of the heater or tray.
- Furnace type, atmosphere and maximum temperature.
- Quantity and delivery timeline.
Need tungsten speciality parts?
Asaus Technologies supplies tungsten mesh heaters and trays made to your drawing. Request a quote.