Since 1927, when heated cathodes were first introduced indirectly, the design of heaters has varied considerably. At the time, a hairpin tungsten heater was supported by an extruded ceramic insulator and surrounded by nickel sleeves.
A on the left shows the tube of A detector and amplifier used in an early common heater. The use of this heater requires a voltage supply of 2.5 volts. It has a warm-up time of 20 to 30 seconds.
Figure B on the left shows 0.002 "diameter tungsten wire wound around the helical orifice of an alumina insulated tube. Return through the insulating rod in the middle. Typically, an alumina coating covers the entire tungsten filament.
C on the left illustrates a 0.070 "diameter tungsten wire wound around the helical orifice of an alumina insulated tube. A molybdenum rod passes through the middle tube and acts as a bearing rod. The heater is designed to operate at 5 volts and 60 amperes.
Figure D on the left shows a 0.025 "diameter heater branch and extruded inside the insulated tube.
The above example is a typical heater shape. In fact, for the convenience of subsequent use, the heater is often made into a variety of different shapes and specifications. Up to now, we can refer to the application field of the heater shape should not be less than 100 kinds.
Application of tungsten heater:
Tungsten heater is made of tungsten wire, which is widely used as the heating element of metal evaporation in the industries of picture tube, mirror making, plastic, organic matter, metal matrix and various ornaments due to its high melting point and strong corrosion resistance.
Tungsten wire is the main material for making tungsten heater, and can also be directly used in semiconductor or vacuum devices as heating elements.
1) vacuum spraying
2) Aluminum coating, ceramic coating, metal, plastic
3) Picture tube aluminum plating
4) mirrors
5) Car headlight reflector
6) aluminum discs
7) Distributor type cathode. Responding to the increasing demand for heaters combined with adapter cathodes. Most of the heater is used to make client prints.
8) For the picture tube and microprocessor chip with the use.
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