Ceramic-Metal Joint Crease Segmentation for Thermal Stress
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Solution Overview
Problem
Conventional ceramic thin plate members in solid oxide fuel cells face issues with thermal stress due to differences in thermal expansion with metal thin plate members, leading to joint breakage and deformation, which affects performance and reliability.
Innovation Solution
A device featuring a ceramic thin plate member supported by a metal thin plate member with radially extending crease portions that act to relax thermal stresses and increase rigidity, preventing joint breakage and deformation, and ensuring consistent performance across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the metal thin plate member has a curved portion surrounding the ceramic thin plate member, then the joint portion is reinforced, but the thermal stress cannot be sufficiently relaxed and the ceramic thin plate member may break
Solution Approach 1:
The single curved portion is segmented into multiple crease portions (first, second, third, and fourth crease portions) arranged circumferentially. This segmentation allows each crease to independently relax thermal stress in different directions while collectively reinforcing the joint, resolving the contradiction between joint strength and thermal stress relaxation.
Solution Approach 2:
The crease portions are positioned asymmetrically at specific angular intervals (e.g., 0°, 90°, 180°, 270°) around the ceramic thin plate member. This asymmetric arrangement optimizes stress distribution and prevents uniform deformation, enabling both joint reinforcement and effective thermal stress relaxation.
2Stability of the object's composition
If the curved portion extends continuously to form a ridge portion surrounding the ceramic thin plate member, then the joint is stabilized, but the rigidity in the perpendicular direction is insufficient causing deformation
Solution Approach 1:
The continuous ridge portion is divided into discrete crease portions separated by intervals. This segmentation provides localized reinforcement at the crease positions while allowing the metal thin plate member to maintain overall rigidity, preventing both joint instability and excessive deformation.
Solution Approach 2:
The crease portions create localized regions of increased rigidity at specific positions around the ceramic thin plate member. These localized rigid zones provide sufficient structural support without requiring a continuous rigid structure, thus maintaining joint stability while preventing overall deformation.
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 crease portions on the metal thin plate member effectively manage thermal stresses and maintain the ceramic thin plate member's position, enhancing the durability and performance of solid oxide fuel cells by preventing deformation and maintaining fuel and air passage integrity.
Implementation Method 1
the temperature of a device (a ceramic thin plate member and a metal thin plate member) changes sharply. As a result, a difference in thermal expansion is produced between the ceramic thin plate member and the metal thin plate member
Implementation Method 2
the curved portion is formed to surround the perimeter of the ceramic thin plate member... the metal thin plate member cannot deform to sufficiently relax the thermal stress acting on the joint portion and/or on the ceramic thin plate member
Data Source
AI summary
A device includes a ceramic thin plate member including a fired ceramic sheet; and a metal thin plate member having an outer shape larger than that of the ceramic thin plate member. An outer circumferential portion of the ceramic thin plate member is joined to the metal thin plate member. The ceramic thin plate member has through holes and a plurality of crease portions. Each crease portion has a ridge portion whose crest continuously extends from a joint portion between the ceramic thin plate member and the metal thin plate member toward an outer circumferential portion of the metal thin plate member. Since thermal stress due to a difference in thermal expansion between the metal thin plate member and the ceramic thin plate member can be relaxed through expansion of the crease portions, the ceramic thin plate member does not deform.