molybdenum disk tungsten applications

tungsten applications

In addition to a small amount of tungsten heating material for high temperature furnace, heater tubes and composite reinforcement endures, most of them are used for the production of white

Tungsten wire

Filament incandescent lamps and molybdenum disk halogen and gas discharge lamp electrodes. Cathode gas discharge lamp for use as tungsten or tungsten rods, in order to reduce its electron work function, shall be added

0.5-3% thorium, tungsten thorium called wire. Since Thorium is a radioactive element, pollute the environment, it made a useful cerium tungsten thorium instead of cerium cerium tungsten wire or rod. But cerium

Evaporation rate, so that a tungsten filament or tungsten, cerium Ce can be used for small power pole gas discharge lamp.

Once the use of tungsten at high temperature recrystallization becomes very brittle in case of a shock or vibration can easily break. In some of the requirements of high reliability electric light

Products in order to prevent breakage of the filament, often in the tungsten molybdenum wire doped with 3 to 5% of rhenium, tungsten, rhenium wire is called, it can make the tungsten brittle transition temperature down to the extension at room temperature

Temperature or below. This is a very strange rhenium effect has not yet been able to find a substitute element rhenium, tungsten produce the same effect.

Tungsten at room temperature has good acid and alkali capacity, but in moist air easily oxidized, so fine tungsten can not be stored for too long in a wet environment. Also tungsten

1200 ℃ down to start the reaction with carbon from tungsten carbide, so the filament to burn hydrogen treatment should pay attention to this issue, otherwise its surface tungsten graphite lubrication

Reacting agent, the filament tungsten sheet must brittle fracture.