Cerium hexaboride electron gun for coating machine

Abstract

The invention provides a cerium hexaboride electron gun for a coating machine. The gun comprises a mounting base, wherein, a cerium hexaboride cathode body is arranged on the mounting base and is a cylinder. The cerium hexaboride is used for replacing a tungsten filament to serve as the cathode body, and the method has the excellent effects that, 1, even if little oxygen exists in a coating chamber, the loss of the cerium hexaboride cathode body is much smaller than that of the tungsten filament, and the service life is long; 2, compared with the tungsten filament, the regular replacement time of the cerium hexaboride cathode body is longer, and the coating process is stable; 3, the electron generation capability is strong, and the bombardment efficiency of high-melting-point materials is high; 4, spots (focus points) of electrons are small, energy is concentrated, and the efficiency of bombarding high-melting-point materials is high; and 5, relatively strong electron generation capability can be achieved by using relatively low voltage, and energy is saved.

Description

technical field [0001] The invention relates to the technical field of coating machines, in particular to a cerium hexaboride electron gun for a coating machine. Background technique [0002] The electron gun is a commonly used component in the coating machine. It can ionize electrons to bombard the high-melting point material when it is energized at high temperature, and then melt the high-melting point material to form steam, and then the steam of the material can be coated on the target workpiece. [0003] At present, the existing electron guns use tungsten wire as the cathode, but the tungsten wire has the following disadvantages: 1. There is very little oxygen in the coating chamber, which will cause the tungsten wire to oxidize and cause serious wear and tear, and the service life is short; 2. The tungsten wire needs 2 Replace once a week, installation and replacement are troublesome, and cause instability to the process; 3. The ability to generate electrons is small, ...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing electron guns use tungsten wire as the cathode, but the tungsten wire has the following disadvantages: 1. There is very little oxygen in the coating chamber, which will cause the tungsten wire to oxidize and cause serious wear and tear, and the service life is short; 2. The tungsten wire needs 2 Replace once a week, installation and replacement are troublesome, and cause instability to the process; 3. The ability to generate electrons is small, resulting in low efficiency of bombarding high-melting point materials; 4. The spots (focus points) of electrons are large, which is not conducive to the concentration of energy, resulting in bombardment Low efficiency for high melting point materials

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