Rotating X-ray Anode Partial Recrystallization
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Solution Overview
Problem
X-ray rotary anodes with fully recrystallized structures face issues with thermal stability, mechanical strength, and surface roughening due to large grain sizes, leading to reduced service life and radiation yield under high temperature and mechanical loads.
Innovation Solution
A rotary X-ray anode produced by powder metallurgy with a carrier body made of molybdenum or a molybdenum-based alloy and a focal track made of tungsten or a tungsten-based alloy, featuring a non-recrystallized or partially recrystallized structure to achieve a fine-grained, high-strength, and high-hardness surface that remains stable under electron beam exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the focal track and carrier body are produced with a fully recrystallized structure, then the structure is stable against subsequent structural changes, but the grain sizes become large leading to surface roughening and reduced strength
Solution Approach 1:
The patent applies controlled heat treatment parameters (temperature and time) to achieve a partially recrystallized state rather than full recrystallization. By optimizing the heat treatment regime, the patent obtains a fine-grained structure with area fraction of recrystallized structure between 5-90%, which maintains structural stability while preventing surface roughening and preserving strength.
Solution Approach 2:
The patent creates a non-uniform microstructure with different degrees of recrystallization in different regions. The focal track and carrier body have area fractions of recrystallized structure within 5-90%, creating a gradient structure that optimizes both surface quality and mechanical properties locally while maintaining overall structural stability.
2Stability of the object's composition
If the focal track and carrier body are produced with a fully recrystallized structure, then the structure is stable against subsequent structural changes, but the strength and hardness are reduced making the material susceptible to plastic deformation
Solution Approach 1:
The patent optimizes heat treatment parameters to achieve partial recrystallization (5-90% area fraction) instead of full recrystallization. This parameter control retains a significant portion of the deformed fine-grained structure, maintaining high strength and hardness while providing sufficient structural stability for high-temperature and high-stress applications.
Solution Approach 2:
The patent creates a composite microstructure consisting of both recrystallized and deformed regions. This composite structure combines the stability of recrystallized grains with the strength of deformed fine-grained regions, achieving both structural stability and mechanical strength simultaneously.
3Strength
If special alloys and atomic or particulate impurities are added to increase strength, then high strength and hardness are achieved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent achieves high strength and hardness through controlled heat treatment parameters and microstructure optimization rather than through complex alloying. By controlling the area fraction of recrystallized structure and grain size, the patent obtains the required mechanical properties using conventional powder metallurgy and heat treatment processes, avoiding the need for special alloys or impurity additions.
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 anode achieves a high dose yield and long service life with improved thermal conductivity and ductility, maintaining a smooth surface and preventing crack formation, even under high-power and high-speed conditions.
Implementation Method 1
A large part of the energy of the electron beam is converted into heat in the rotating X-ray anode
Implementation Method 2
the carrier body must ensure effective heat dissipation of the heat released at the point of impact of the electron beam
Data Source
Figure 1A~2
Figure 3~4D
Figure 5A~7
AI summary
The present invention relates to a rotating X-ray anode (10) comprising a support body (14) and a firing track (16) formed on the support body (14). The support body (14) and the firing track (16) are manufactured as a composite by powder metallurgy; the support body (14) is made of molybdenum or a molybdenum-based alloy, and the firing track (16) is made of tungsten or a tungsten-based alloy. In the subsequently heat-treated rotating X-ray anode (10), at least a section of the firing track (16) is present in a non-recrystallized and/or partially recrystallized structure.