When tungsten is heated, it undergoes several significant changes and exhibits unique behaviors.
What happens to tungsten when heated? 4 key behaviors explained
1. High Melting Point and Strength Retention
Tungsten has an extremely high melting point. This allows it to maintain its strength even at elevated temperatures. It is ideal for high-temperature applications like heating elements in furnaces.
2. Susceptibility to Embrittlement and Oxidation
Tungsten is prone to embrittlement and mechanical and thermal shock. It starts to oxidize in air at temperatures around 500°C (932°F). The oxidation process accelerates significantly above 1200°C (2192°F). Heating elements made of tungsten must be shielded from air exposure.
3. Performance in Vacuum Conditions
In vacuum environments, tungsten can withstand extremely high temperatures. It can be used at temperatures up to 2000°C (3632°F) under a pressure of less than 10-2 torr. It remains resistant to evaporation up to about 2400°C (4,352°F) at less than 10-4 torr. This makes tungsten perfect for vacuum furnaces and other high-temperature, non-oxidizing settings.
4. Processing and Industrial Applications
Tungsten powder is pressed into shapes and then sintered at high temperatures. This process, typically done between 2000 – 2500ºC (3630 – 4530ºF), enhances its density and strength. Tungsten's unique properties make it valuable in various industries. These include lighting (incandescent light bulbs), electrical (electrical contacts), medical (X-ray radiation shielding), and construction (boring bars). Its mechanical properties can be improved through metalworking, alloying, and the addition of elements like cerium or lanthanum.
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