Transmission Target Structure With Carbon Interlayer for Crack Suppression
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Solution Overview
Problem
Radiation generating apparatuses with transmission type targets suffer from microcracks in the target layer due to thermal stress and linear expansion coefficient mismatch between the target layer and diamond substrate, leading to unstable anode potential and fluctuations in radiation output.
Innovation Solution
Incorporating a carbon-containing region with sp2 bonds between the target layer and diamond substrate to act as a stress-relieving and conductive intermediate layer, reducing thermal stress and enhancing adhesion, thereby stabilizing the anode potential and suppressing microcrack formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transmission type target with diamond substrate is used to improve heat release and radiation transmission, then radiation generation efficiency is improved, but microcracks occur in the target layer due to thermal stress and linear expansion coefficient mismatch
Solution Approach 1:
A carbon-containing layer is introduced as an intermediate layer between the target layer and diamond substrate. This intermediate layer acts as a mediator that reduces thermal stress and compensates for linear expansion coefficient mismatch, preventing microcrack formation while maintaining the high heat release and radiation transmission properties of the diamond substrate
Solution Approach 2:
The target structure is designed as a composite material system consisting of multiple layers: target layer, carbon-containing layer, and diamond substrate. Each layer contributes specific properties - the diamond substrate provides high heat conductivity and radiation transmission, while the carbon-containing layer provides stress relief and adhesion, achieving overall system reliability
2Temperature
If diamond substrate is used to support the target layer, then heat conductivity and radiation transmission are improved, but adhesion between target layer and substrate deteriorates due to low wettability to molten metal
Solution Approach 1:
The carbon-containing layer serves as an intermediary between the target layer and diamond substrate, improving adhesion by providing better wettability to molten metal while the diamond substrate maintains its superior heat conductivity and radiation transmission properties
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 stabilizes the anode potential and suppresses radiation output fluctuations, ensuring a reliable and durable transmission type target with reduced microcrack occurrence, even under prolonged operation.
Implementation Method 1
linear expansion coefficient mismatch occurs between diamond and solid metal. Thus, diamond has low affinity to a target metal. Ensuring the adhesion between a target layer and a diamond substrate has been the issue that needs to be addressed
Implementation Method 2
Incorporating a carbon-containing region with sp2 bonds between the target layer and diamond substrate to act as a stress-relieving and conductive intermediate layer
Implementation Method 3
Diamond has not only high heat-resistance and high heat conductivity but also a high radiation transmitting property
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3A~3C
AI summary
A radiation emitting target (9), a radiation generating apparatus (101), and a radiography system (60) are provided in which adhesion between a target layer and a diamond substrate is improved and stable radiation emitting properties are exhibited. A transmission type target (9) includes a target layer (42), a carbon-containing region (45, 47) including sp2 bonds, and a diamond substrate (41, 46) that supports the target layer. The carbon-containing region is positioned between the target layer and the diamond substrate.