Anode Target Plate Brazing with Induction and Beam Heating
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Solution Overview
Problem
The anode target plate in X-ray generators faces challenges in maintaining performance at high temperatures due to its low heat capacity and high density, leading to inefficient brazing processes in existing vacuum furnaces, which are slow, require complex vacuum equipment, and lack effective temperature control.
Innovation Solution
A brazing apparatus and method using medium-frequency induction welding and directional energy beams, such as electron beam welding, to rapidly and uniformly heat a molybdenum alloy target plate with a graphite substrate in a vacuum environment, ensuring efficient bonding and improved thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional vacuum furnace brazing is used, then the anode target plate can be brazed, but the heating speed is slow and the process is inefficient
Solution Approach 1:
The patent replaces the traditional thermal conduction heating system with an induction heating system that uses electromagnetic fields to directly heat the workpiece. The induction heating apparatus generates an alternating magnetic field that induces eddy currents in the conductive anode target plate, converting electrical energy directly into heat within the workpiece itself, thereby eliminating the slow heat transfer process of traditional furnaces and achieving rapid heating.
Solution Approach 2:
The patent changes the heating method from conventional thermal conduction to induction heating with controllable frequency and power parameters. By adjusting the induction heating frequency and power input, the heating speed and temperature distribution can be precisely controlled, enabling rapid heating while maintaining process quality and significantly reducing brazing cycle time.
2Reliability
If the anode target plate uses pure metal with high density, then durability is improved, but heat capacity decreases and high-temperature performance deteriorates
Solution Approach 1:
The patent employs composite material construction for the anode target plate, combining a molybdenum alloy base material with a tungsten-rhenium coating layer. The molybdenum alloy provides high heat capacity and thermal conductivity to manage heat during operation, while the tungsten-rhenium coating layer contributes high density, hardness, and radiation resistance. This composite structure synergistically achieves both high heat capacity and durability required for high-power X-ray generation.
3Reliability
If vacuum furnace brazing is used, then a vacuum environment is provided, but the equipment is complex and temperature control is insufficient
Solution Approach 1:
The patent replaces the complex temperature control system of traditional vacuum furnaces with an induction heating system that offers precise digital control of heating parameters. The induction heating apparatus allows independent control of frequency and power, enabling accurate temperature management through electronic feedback systems, thereby simplifying the overall equipment structure while maintaining vacuum environment requirements.
4Productivity
If the anode target plate is heated rapidly, then brazing efficiency is improved, but temperature uniformity may deteriorate
Solution Approach 1:
The patent implements local quality control in the induction heating system by using selectively positioned heating coils or electromagnetic fields that can be independently controlled. Different regions of the anode target plate receive customized heating intensity based on their specific requirements, with higher power applied to areas needing faster heating and lower power to regions requiring temperature uniformity, thereby achieving both rapid heating and precise temperature distribution control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables faster and more uniform heating of the anode target plate, enhancing the efficiency and quality of brazing, thereby improving the durability and performance of the anode target plate under high-temperature conditions.
Implementation Method 1
an induction brazing part for applying an induction current to the target plate main body, the brazing material, and the substrate in the vacuum part so as to at least heat the brazing material to a temperature higher than a melting point
Implementation Method 2
a directional energy welding part for applying a generated directional energy beam to a position of lower temperature determined on the target plate main body to perform heating
Data Source
AI summary
A brazing apparatus and method for brazing an anode target plate of an X-ray generator are disclosed. The brazing apparatus comprises: a vacuum part for providing, during brazing, a vacuum environment at least for a target plate main body formed of an alloy, a brazing material, and a substrate; an induction brazing part for applying an induction current to the target plate main body, the brazing material and the substrate in the vacuum part so as to achieve heating to a temperature higher than the melting point of the brazing material, causing the substrate to be welded to the target plate main body through melting of the brazing material and a resulting reaction; and a directional energy welding part for applying a generated directional energy beam to a position of lower temperature determined on the target plate main body to perform heating.