Tungsten Trisilicide

Tungsten and silicon at 1900 ℃ sintered in an argon gas to form tungsten disilicide and  tungsten trisilicide.
Tungsten trisilicide was known as W5Si3, is in a tetragonal crystal, its physical properties are as follows: chemical formula: W5Si3, molecular weight: 1003.77, melting point: 2320 ℃, decomposition at about 1450 ℃, in air at 500 ~ 700 ℃ will oxidized, dissolved in HNO3 + HF mixed acid.
There are some system numbers about tungsten trisilicide which are as follows: CAS registry number: 12039-95-1, EINECS System number: 234-912-7.
Tungsten trisilicide can produce by tungsten and silicon reaction, the chemical equation of  producing process is 5W + 3Si → W5Si3, which the producing process is as follows:
1. In accordance the molar ratio of the tungsten and silicon is 5:3 and then mixing them with evenly.
2. pass over argon to reactor, and then at the 1400 ℃ to sintered tungsten trisilicide in an argon atmosphere.

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