Vacuum brazing method of dispersion copper

Abstract

The invention discloses a vacuum brazing method of dispersion copper. The vacuum brazing method mainly comprises the following steps that S1, the surface of a dispersion copper workpiece and the surface of a Kovar alloy workpiece are cleaned and dried for use; S2, graphene composite particles are adopted as sand blasting raw materials, and surface sand blasting treatment is carried out on the surface of dispersion copper; S3, the dispersion copper workpiece is placed in a rare gas atmosphere, heating is carried out, compressed modified liquid is used for carrying out injection treatment on thesurface of the dispersion copper workpiece, and laser irradiation treatment is carried out on the surface of the dispersion copper workpiece; S4, film electroplating is carried out, wherein film electroplating treatment is carried out on the dispersion copper workpiece, so that the surface of the dispersion copper workpiece is covered with a metal film; and S5, the coated dispersion copper workpiece, the Kovar alloy workpiece obtained after surface purification is carried out and a brazing filler metal are placed in a vacuum brazing furnace for vacuum brazing. According to the vacuum brazingmethod, the surface binding force of a Cu or Ni film and the dispersion copper and the brazing welding effect of the Cu or Ni film and a Kovar alloy can be effectively improved, residual stress between all metal joints is eliminated, and the mechanical performance of the brazing joints is enhanced.

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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