Single-Crystal Diamond X-Ray Window Orientation for Crack Resistance
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Solution Overview
Problem
Window members formed in a plate shape from single crystal diamond in X-ray tubes are prone to cracking, especially in small-focus X-ray inspection devices where the inspection object is close to the window member, necessitating improved crack resistance.
Innovation Solution
The [100] direction of the single crystal diamond in the window member is oriented at an angle of less than 45 degrees relative to the thickness direction, reducing the number of parallel crystal planes and enhancing crack resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the window member is formed in a plate shape from single crystal diamond, then X-ray transmission properties and heat resistance are improved, but crack resistance deteriorates
Solution Approach 1:
The patent changes the crystal orientation parameter of the single crystal diamond by controlling the angle between the <100> direction and the thickness direction to be 45 degrees or less. This parameter change reduces the number of crystal planes parallel to the thickness direction, thereby improving crack resistance while maintaining X-ray transmission properties.
2Measurement precision
If the inspection object is brought closer to the window member to increase magnification, then imaging capability is improved, but the risk of contact and cracking increases
Solution Approach 1:
By changing the crystal orientation parameter (angle between <100> direction and thickness direction to 45 degrees or less), the window member gains enhanced crack resistance, allowing the inspection object to be positioned closer to the window member for higher magnification without increasing the risk of contact-induced cracking.
3Ease of manufacture
If the <100> direction is parallel to the thickness direction, then manufacturing simplicity is maintained, but the number of parallel crystal planes increases causing higher crack susceptibility
Solution Approach 1:
The patent modifies the crystal orientation parameter by setting the angle between the <100> direction and the thickness direction to 45 degrees or less. This change reduces the number of crystal planes parallel to the thickness direction, improving crack resistance while remaining feasible for manufacturing through controlled crystal growth or selection.
Data Source
AI summary
An X-ray tube includes a housing, an electron gun that emits an electron beam inside the housing, a target that generates an X-ray upon an incidence of the electron beam inside the housing, and a window member that seals an opening of the housing and that transmits the X-ray. The window member is formed in a plate shape from a single crystal diamond. A [100] direction of the single crystal diamond is in an intersection relationship with a thickness direction of the window member at an angle of less than 45 degrees.