Asymmetric Ceramic Window Mounting for Thermal Stress Relief
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Solution Overview
Problem
Synthetic diamond plates face limitations in size, brittleness, difficulty in mounting, and thermal stress issues due to high hardness and low tensile strength, leading to potential fracture and de-bonding when used in applications requiring large areas and high temperatures.
Innovation Solution
A ceramic window assembly with an asymmetrical mount and a superstructure that redistributes stress, converting tensile stress into compressive stress using materials with lower thermal expansion coefficients, such as ceramics or synthetic diamond, to manage thermal expansion mismatch and reduce fracture risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If synthetic diamond plates are used for large area applications, then optical transparency and thermal conductivity are improved, but size is limited due to difficulty in growing diamond material over large area
Solution Approach 1:
The patent divides the large optical component requirement into multiple smaller diamond plates that can be individually grown and processed with high quality, then assembled together to achieve the required large area while maintaining optical and thermal performance
2Strength
If diamond material is used, then hardness and scratching resistance are improved, but brittleness increases making the material prone to fracture
Solution Approach 1:
The patent applies compressive pre-stress to the diamond plate through asymmetric mounting that creates compressive forces counteracting the inherent tensile stresses, thereby preventing fracture while maintaining the material's hardness and optical properties
3Strength
If diamond material is bonded to mounting structures, then mechanical support is improved, but thermal expansion mismatch causes stress and potential de-bonding
Solution Approach 1:
The patent employs asymmetric mounting configurations where the mount is bonded to only one side of the diamond plate, creating compressive pre-stress that compensates for thermal expansion mismatch stresses during temperature cycling, thereby maintaining bond integrity while providing mechanical support
4Manufacturing precision
If diamond material is processed into precise geometries, then optical performance is improved, but difficulty in processing increases due to high hardness and low toughness
Solution Approach 1:
The patent performs all precise geometric processing and surface finishing operations while the diamond plate is still in its stress-free state before mounting, thereby achieving high manufacturing precision without the complications of processing brittle, pre-stressed material
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 assembly effectively mitigates tensile stress, preventing fracture and maintaining structural integrity under thermal cycling, ensuring reliable operation in high-temperature environments.
Implementation Method 1
a superstructure, wherein the superstructure is mechanically stressed. The superstructure may be arranged to reduce tensile stress within the window, and/or to turn tensile stress into compressive stress
Implementation Method 2
the rigidity of the diamond material in combination with a thermal expansion mismatch to the mounting material can lead to thermally induced stresses and potential de-bonding or fracture of the diamond component
Data Source
AI summary
A ceramic window assembly, comprising a ceramic window, a mount bonded to the ceramic window and comprising an asymmetry; and a superstructure, wherein the superstructure is mechanically stressed.