Method for preparing CT bulb tube rotor copper sleeve through combination of vacuum diffusion welding and vacuum brazing

A technology of vacuum diffusion welding and rotor copper, which is applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems that copper sleeves cannot be realized, have many pores and gaps, and are prone to oxidation, so as to avoid the phenomenon of convex and concave , high degree of fit, and the effect of improving wettability

Active Publication Date: 2021-05-14
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high heat capacity of the CT tube, a larger torque is required to drive the target disk to rotate at a high speed, so the ordinary rotor copper sleeve cannot be realized, and a high-performance cast copper rotor is required
[0003] The melting point of copper is high. Generally, the copper sleeve of CT tube adopts the die-casting method. The copper liquid is injected into the mold cavity, the pressure is applied, and then the copper liquid is squeezed into the steel matrix with gaps. The steel-copper interface is tight, and there are almost no pores and holes. However, due to non-vacuum conditions, it is prone to oxidation; while vacuum brazing will not oxidize, it is flexible and can meet the needs of small batches in special industries. The disadvantage is that there are many pores and gaps at the steel-copper interface, which will Excessive deflation and deformation

Method used

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  • Method for preparing CT bulb tube rotor copper sleeve through combination of vacuum diffusion welding and vacuum brazing
  • Method for preparing CT bulb tube rotor copper sleeve through combination of vacuum diffusion welding and vacuum brazing
  • Method for preparing CT bulb tube rotor copper sleeve through combination of vacuum diffusion welding and vacuum brazing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Vacuum diffusion welding combined with vacuum brazing prepares the method for CT ball tube rotor copper sleeve, comprising the following steps:

[0037] S1. Surface treatment: The carbon steel substrate 1 and several copper guide bars 2 are sequentially polished by pickling, alkali washing and metallographic sandpaper to remove surface grease and oxides, and the copper guide bars 2 are ultrasonically electroplated with silver, and the thickness of the silver coating is 0.2 mm, obtain the copper guide bar 2 after electroplating; the material of the carbon steel substrate 1 is 15# carbon steel, and the material of the copper guide bar 2 is T2 copper;

[0038]S2. Vacuum diffusion welding: Insert the electroplated copper guide bars 2 into the radial fixing grooves 11 of the carbon steel substrate 1 one by one, then put the carbon steel substrate 1 into the vacuum power generation plasma equipment, and adopt the pulse current power generation method, Among them, the base val...

Embodiment 2

[0047] This embodiment is basically the same as Embodiment 1, except that the fixture includes a graphite substrate 4 and a fixing ring 5 for fixing the rotor. There is a turntable 7, and an annular groove 8 is provided on the surface of the graphite substrate 4 located in the lower part of the placement groove 6. The annular groove 8 corresponds to the brazing position of the carbon steel substrate 1 and the copper end ring 3. The fixed rings 5 ​​are two groups and are respectively located in the ring On the upper and lower sides of the groove 8, a protruding ring 9 is provided on the outer circumference of the turntable 7, and a groove connected to the protruding ring 9 is provided inside the graphite substrate 4 in rotation.

Embodiment 3

[0049] This embodiment is basically the same as Embodiment 1, the difference lies in that the pre-set brazing material process parameters in vacuum brazing are different.

[0050] S3-1. Preset brazing material: evenly lay sheet-shaped brazing filler metal at the end of carbon steel substrate 1 after vacuum diffusion welding, and lay a thin pure aluminum sheet with the same area on the top of the sheet-shaped brazing filler metal. The middle layer auxiliary material is laid on the top, and the sheet solder with the same area as the thin pure aluminum sheet is laid on the middle layer auxiliary material; the composition and content of the sheet solder are Ag 87.5wt%, In 6wt%, Cu 4wt%, Cd 2.5wt %, the thickness of the sheet solder is 0.5mm, the thickness of the pure thin aluminum sheet is 60μm, and the auxiliary material of the middle layer is superfine WO 3 Nanowires.

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Abstract

The invention discloses a method for preparing a CT bulb tube rotor copper sleeve through combination of vacuum diffusion welding and vacuum brazing, comprising the following steps: S1, surface treatment: performing surface treatment on a carbon steel basal body and a plurality of copper conducting bars, and electroplating silver on the copper conducting bars; S2, vacuum diffusion welding: inserting the copper conducting bars into radial fixed grooves of the carbon steel basal body, and then putting the carbon steel basal body into vacuum power generation plasma equipment for vacuum diffusion welding; S3, vacuum brazing: performing vacuum brazing between the carbon steel basal body and a copper end ring after the copper conducting bars are fused by adding brazing filler metal at the temperature of 900-950 DEG C, and then obtaining a workpiece; S4, heat treatment: continuously placing the workpiece after the vacuum brazing in a vacuum brazing furnace for heat treatment; and S5, precision machining. The vacuum diffusion welding and the vacuum brazing are combined to prepare a rotor copper sleeve that meets high-temperature vacuum use environment of a CT bulb tube; and the special requirements of the CT bulb tube industry can be met.

Description

technical field [0001] The invention relates to the technical field of preparing a CT spherical tube rotor by brazing, in particular to a method for preparing a CT spherical tube rotor copper sleeve by vacuum diffusion welding combined with vacuum brazing. Background technique [0002] CT tube is a high vacuum cathode ray diode used to generate X-rays. When the current is heated by the cathode filament, free electrons are generated. The electron beam hits the anode molybdenum-based tungsten target at high speed by the cathode, and 1% of the electric energy is converted into X-rays and emitted, and the rest is converted into heat energy and dissipated. Due to the high heat capacity of the CT tube, a larger torque is required to drive the target disk to rotate at a high speed, so the copper sleeve of the common rotor cannot be realized, and a high-performance cast copper rotor is required. [0003] The melting point of copper is high. Generally, the copper sleeve of CT tube a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K3/08
CPCB23K1/008B23K3/085
Inventor 赵永兵刘锦慧王非岳佳伟杨维娟杨平
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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