Shaoxing Xinshan Science Technology Co.,Ltd
Address: Dongfangyimai, No. 2, Pujiang Road, Shaoxing, China
Incandescent bulbs will power up the filament is heated to incandescence, heat radiation of visible light source. By the State through the filament is heated to incandescence by an electric current produces a light source to light. First light is.
A light incandescent-filament temperatures as high as 3,000 degrees centigrade. Precisely because of the hot filament producing the light radiation, bright light makes the light. Because some tungsten atoms evaporate into a gas at high temperature, and deposited on the glass surface of the lamp, lamp black, incandescent bulbs were causing "pot-bellied" appearance, which is to make the deposited tungsten surface diffusion of atomic energy in a big open.
Tungsten oxide in air to form a thin layer of blue trioxide in tungsten and tungstic oxide mixture. Due to oxygen in the air to high temperatures of tungsten oxide. So the tungsten lamp to vacuum, all the air out.
Sometimes afraid of the air pump is not clean, apply phosphorus lamp posts. Heated red phosphorus white phosphorus, white phosphorus can easily react with oxygen to generate solid phosphorus pentoxide, residual oxygen in the glass shell is also eliminated.
Incandescent bulbs with long bulb will turn black, and then over a period of time will burn because than carbon filament of tungsten wire, sublimation is much faster in a vacuum. When incandescent lamps light up when the temperature rose so high, sublimation of tungsten is still very serious. Long time high temperature tungsten surface diffusion sublimated tungsten atoms, then deposited a layer after layer on the inner surface of the glass, slowly blackening of glass shell, evaporation of the tungsten filament of tungsten more and more detailed, final burn. Higher filament temperature tungsten sublimating faster, shorter service life of incandescent lamps.