X-ray tube cathode cup texturing for emitter adhesion
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Solution Overview
Problem
In x-ray systems, the thermal expansion mismatch between the cathode cup and deposited emitter material leads to thermo-mechanical stress, causing the emitter material to flake off and potentially result in emitter failure due to loose or flaking sublimated material, which affects high voltage stability and system reliability.
Innovation Solution
The cathode cup is chemically or mechanically textured to create a microstructure with features that enhance the adhesion of sublimated emitter material, reducing the likelihood of material peeling off and extending the emitter's lifespan by retaining the material on the cup surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode cup surface is left smooth, then the manufacturing process is simple, but the emitter material flakes off due to thermal expansion mismatch
Solution Approach 1:
The cathode cup surface is pre-textured before emitter deposition to create a microstructure that will later enhance adhesion. This preliminary surface preparation ensures that when emitter material is deposited, it adheres more strongly despite thermal expansion differences during operation.
Solution Approach 2:
The cathode cup surface is transformed into a porous or micro-structured surface through texturing processes. This increased surface roughness and porosity provide mechanical interlocking for the emitter material, significantly improving adhesion and preventing flaking during thermal cycling.
2Duration of action of stationary object
If the emitter material is retained on the cup surface, then the operational duration is extended, but the surface structure becomes more complex
Solution Approach 1:
The cathode cup surface is pre-textured before emitter deposition to create a microstructure that will later enhance adhesion. This preliminary surface preparation ensures that when emitter material is deposited, it adheres more strongly despite thermal expansion differences during operation.
Solution Approach 2:
The cathode cup surface is transformed into a porous or micro-structured surface through texturing processes. This increased surface roughness and porosity provide mechanical interlocking for the emitter material, significantly improving adhesion and preventing flaking during thermal cycling.
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 textured surface effectively captures and retains sublimated emitter material, reducing emitter degradation and extending the emitter's operational duration by preventing premature material spalling, thus enhancing the stability and longevity of the x-ray system.
Implementation Method 1
chemically and/or mechanically texturing a surface of a cathode cup
Implementation Method 2
chemically and/or mechanically texturing a surface of a cathode cup
Implementation Method 3
enhance the adhesion of sublimated emitter material
Implementation Method 4
material from the emitter may be exposed to high temperatures. Such elevated temperatures may cause material from the emitter to sublimate
Data Source
AI summary
Various methods and systems are provided for a cathode cup having a surface texturing to aid in adherence of emitter deposited films. In one embodiment, a method may include chemically and/or mechanically texturing a surface of a cathode cup to form a plurality of features with a higher than threshold depth of each feature, the surface of the cathode cup facing an emitter coupled to the cathode cup.