A method for vacuum brazing of dispersed copper

Abstract

The invention discloses a method for vacuum brazing of dispersed copper, which mainly includes the following steps: S1: cleaning the surfaces of dispersed copper workpieces and Kovar alloy workpieces, and drying them for use; S2: using graphene composite particles as sandblasting raw materials, Sandblasting the surface of the dispersed copper; S3: Place the dispersed copper workpiece in a rare gas atmosphere, and heat up, spray the surface with a compressed modification liquid, and perform laser irradiation treatment on the surface; S4: Electroplating and coating: Electroplating and coating the dispersed copper workpiece to make the surface covered with a metal film layer; S5: Put the dispersed copper workpiece after coating, the kovar alloy workpiece and brazing material after the surface is removed into the vacuum brazing furnace for vacuum brazing weld. The invention can effectively improve the surface binding force between the Cu or Ni film layer and the dispersed copper and the brazing and welding effect with the Kovar alloy, eliminate the residual stress between the metal joints, and enhance the mechanical properties of the brazing joints.

Description

technical field [0001] The invention relates to the technical field of vacuum brazing, in particular to a method for vacuum brazing of dispersed copper. Background technique [0002] The production of rotating anode X-ray tubes has made a leap forward in the development of diagnostic X-ray tubes, which has strongly promoted the development of medical diagnostic technology. In order to shorten the exposure time of X-ray photography and obtain clear images, X-ray tubes should X-rays with high density are generated in a short period of time. For this reason, the power of the X-ray tube must be increased. However, the power of the energy supplied to the tube into X-rays is very low, and more than 99% of the energy is converted into heat and dissipated in the On the anode, the temperature of the anode rises rapidly. In the fixed anode X-ray tube, because the heat is concentrated on the point focus, the anode is easily overheated and melted locally. However, in the rotating anode ...

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Problems solved by technology

[0003] With the continuous development of medical equipment, the performance requirements of the rotating anode X-ray tube in the medical field are getting higher and higher. Among them, the mechanical properties of the rotor copper sleeve and the bearing assembly material are relatively high. Because the dispersed copper has high strength, high conductivity, and high Softening temperature and other characteristics, it is often preferred to prepare the rotor copper sleeve of the X-ray tube, but the dispersed copper workpiece is difficult to braze with the alloy to be welded (such as Kovar alloy), and at the same time in the vacuum brazing process, due to various The difference in thermal expansion coefficient between materials is large, and the joints in brazing are prone to generate large residual stress, thereby seriously reducing the mechanical properties of the joints. The present invention mainly reduces the residual stress of brazed joints through the following points; therefore, now Need a kind of vacuum brazing method that can enhance the brazing performance of dispersed copper and the alloy to be welded to solve the above problems

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