Tungsten heating element for high temperature applications

Tungsten heating element for high temperature applications Tungsten has also another popular name – Wolfram having the highest melting point among all elements excluding carbon, it is about 3387oC – 3422oC. It also has the supreme elevated temperature mechanical characteristics and smallest coefficient of thermal expansion among all metals. Tungsten needs heating up to 5700oC to boil it that is a temperature at the surface of sun.

Considering its density, it is about 19.25 g/cm3. Tungsten is a heavy metal with electrical conductivity about 28% at 0oC as of the silver so it is also the maximum value among all metals.

Pure tungsten is a bright metal and is easy to process. Often it contains nominal magnitudes of carbon and oxygen that offer tungsten significant hardness and brittleness. It also features the nominal vapour pressure among all metals, high moduli of compression and elasticity, good thermal creep resistance, good thermal and electrical conductivity and a good coefficient of electron emission. Most of the exclusive characteristics are with good binding energy. Depending on these characteristics, tungsten mesh is unique for its exclusive applications in the various fields of advanced technology.

Tungsten is found in the natural state in the form of chemical compounds and its minerals are named wolframite and scheelite.

Tungsten recycling Recycling is an essential factor in the industry of tungsten. According to estimates, 30% is recycled and the tungsten processing industry is treated with each type of tungsten based scrap and waste to reclaim tungsten and if available other significant elements.

Contaminated cemented carbide scrap, turnings, grindings and powder scrap are oxidized and chemically treated in a way identical to that utilized for the treatment of tungsten ores. If available,

cobalt and niobium are claimed in the separate treatment lines. The cemented carbide inserts and compacts are changed to powder by the zinc treatment. The powder is added to the development of readily pressable powder. During this process, tungsten carbide as well as cobalt, tantalum carbide and other carbides are recycled.

Tungsten recycling at the large pace is high and usually melt includes 60 -70% scrap.

Recycling in these applications include lamp filaments, welding electrode and chemical applications.

However tungsten appears to be relatively toxic-free to the environment, the environmental facts have given rise to increased recycling rate, particularly when the material consists of various other metals besides of tungsten.

Tungsten mesh heating elements Tungsten has a common use as Tungsten wire mesh for high temperature furnace heating. The mesh heating elements are highly durable and have large watt density.

Tungsten mesh offers the maximum service temperature limit about 3000oC in an inert condition. It has very high vapour pressure that permits elevated temperature service. This heating element serves in a same manner as an incandescent light bulb. The partial pressure argon gas in the bulb secures the mesh from oxygen and releases the heat. The gap between element and glass bulb secures the glass. The tungsten mesh heating element is used in the furnace at 2200oC, it will be bright at 100-watt bulb. Tungsten wire mesh is produced by using the different weaving techniques, contact the manufacturer to discuss your requirements.