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Light bulbs we have all seen
Maybe many people will think about a problem.
If you remove the outer glass lampshade
Will the tungsten wire behind the power supply still illuminate? metal fabrication shops
First in the light bulb
The filament is made of tungsten wire
The high temperature resistance of metal tungsten is very prominent. metal fabrication shops
So after thousands of trials
Selected as a material for the filament
But the high temperature resistance of metal tungsten
Must be in the absence of oxygen
Because it is burned incandescent
When it encounters oxygen, it turns into a yellowish tungsten oxide.
This not only becomes very brittle
And lost conductivity. metal fabrication shops
Therefore, the filament made of tungsten
When it is burned to emit electricity for power supply
First you have to isolate it from the air.
This is why the bulb
There must be a glass bulb to cover it.
And not only to cover
After the cover, the air remaining in the bulb should be cleaned up. metal fabrication shops
Filled with an argon that does not chemically react with tungsten
And well sealed
So if there is no glass bulb cover
The filament can also shine but it will burn out soon. metal fabrication shops