Brazing method for water load isolating square ceramic chip

Abstract

The invention discloses a brazing method for a water load isolating square ceramic chip. The brazing method comprises the following steps: step 1, the square ceramic chip (4) is placed into a square waveguide tube (3); step 2, bow blocks (1) are fixed on the outer lateral wall of the square waveguide tube (3); step 3, brazing solder is used for brazing the square ceramic chip (4) and the square waveguide (3), wherein the bow blocks (1) are expansion alloy blocks and wound with metal wires, so that the bow blocks (1) can be tightly attached to the outer lateral wall of the square waveguide tube (3), the expansion coefficient of the metal wires is smaller than 6*10<-6> / DEG C and the melting point is not lower than 2,000 DEG C. By means of the brazing method, the square waveguide tube in a water load is welded with the square ceramic chip more tightly, and the vacuum tightness of brazing of the isolating ceramic chip is improved.

Description

technical field [0001] The invention relates to a brazing method of water-loaded isolated square ceramic sheets. Background technique [0002] The medical linear accelerator is a microwave vacuum device that transmits microwave energy to electrons through the action of an electromagnetic field. After the electrons obtain microwave energy, they accelerate and bombard the tungsten target to generate X-rays. A large amount of microwave energy is transmitted to electrons, but some energy is not absorbed by electrons. If this part of energy is not disposed of, there will be microwave radiation, which will cause adverse effects on the environment. Therefore, with a water load, the remaining microwave energy is absorbed by the flowing water, converted into heat and consumed. The other end of the water load is filled with high-voltage insulating gas, so it is necessary to isolate the flowing water from the high-pressure insulating gas. While isolating water, microwaves are require...

AI Technical Summary

Problems solved by technology

The reliable sealing connection between ceramics and metals is brazing, but the square waveguide is made of oxygen-free copper, and the expansion coefficient of oxygen-free copper is much larger than that of ceramics. It is difficult to match when brazing, so the connection between ceramics and oxygen-free copper There are often problems with the welding strength and quality of the welding, and air leakage is prone to occur when it is subjected to more than two atmospheric pressures; if the isolation ceramic sheet leaks, it will directly lead to damage to the microwave vacuum device

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