Anode Target Layer Overflow Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing X-ray generating tubes experience a drop in X-ray quality due to the overflow of brazing filler metal during the manufacturing process, which results in unwanted X-ray emission and reduced performance over repeated operations.
Innovation Solution
An anode design featuring a target layer supported by a substrate with a tubular anode member joined via a conductive member with a higher melting point than the brazing filler, preventing the overflow of the brazing filler metal onto the target layer during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brazing filler metal is used to join the support substrate to the envelope, then vacuum sealing is achieved, but the brazing filler metal overflows onto the target layer during operation
Solution Approach 1:
A barrier layer is introduced as an intermediary between the target layer and the brazing filler metal. This barrier layer prevents the brazing filler metal from directly contacting and contaminating the target layer, while still allowing the brazing process to proceed for vacuum sealing. The barrier layer acts as a mediator that resolves the conflict between achieving reliable joining and preventing harmful overflow.
Solution Approach 2:
The target structure is segmented into distinct functional layers: the target layer for X-ray generation, the barrier layer for protection, and the support substrate for structural support. This segmentation isolates the target layer from the brazing filler metal, allowing each layer to perform its specific function without interference from adjacent layers.
2Reliability
If the target layer is electrically connected to the anode using conductive material, then electrical potential is defined, but the conductive material also serves as a barrier to brazing filler metal overflow
Solution Approach 1:
The barrier layer is designed to serve multiple functions simultaneously: it acts as a physical barrier to prevent brazing filler metal overflow, provides electrical connection between the target layer and anode, and maintains structural integrity. This multi-functionality eliminates the need for separate components, thereby reducing overall device complexity while achieving reliable electrical connection.
3Strength
If brazing is performed at high temperature to ensure vacuum sealing, then joining strength is improved, but the brazing filler metal becomes more fluid and increases overflow risk
Solution Approach 1:
The barrier layer is applied to the target layer before the brazing process begins. This preliminary action ensures that when high-temperature brazing is performed to achieve strong joining, the barrier layer is already in place to contain and control the brazing filler metal, preventing it from overflowing onto the target layer despite the increased fluidity at elevated temperatures.
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 effectively maintains X-ray quality by preventing the brazing filler metal from covering the target layer, ensuring consistent and reliable X-ray emission characteristics over extended use.
Implementation Method 1
The accelerated electrons collide with a target layer formed in the anode, thereby generating an X-ray
Implementation Method 2
melting a brazing filler metal by heating the brazing filler metal to 780° C. to 900° C. is required to join, by brazing, in vacuum, the support substrate
Implementation Method 3
a conductive member that has a melting point higher than a melting point of the joining member
Data Source
AI summary
Provided is an anode for an X-ray generating tube, which reduces a drop in the quality of an emitted X-ray due to the history of X-ray emitting operation. A target layer is formed on the inside of the edge of a support substrate. An end portion of an extended portion of a joining member, which protrudes over a support surface of the support substrate, is covered with a conductive member higher in melting point than the joining member. The conductive member is electrically connected to the target layer, thereby electrically connecting the joining member to the target layer.