Layered Ceramic Structure with Crystallinity Control for Durability
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Solution Overview
Problem
Existing ceramic structures, particularly those made by chemical vapor deposition, lack sufficient durability due to issues with crystallinity and structural integrity, leading to potential peeling and cracking.
Innovation Solution
A ceramic structure comprising a first layer and a second layer, where the first and second crystal particles are composed of specific metal and non-metal elements, with a controlled half-width ratio in X-ray diffraction peaks, and incorporating gaps and pillar-shaped crystals to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a ceramic structure is made by chemical vapor deposition to achieve a dense film with high smoothness, then manufacturing precision is improved, but durability deteriorates due to insufficient crystallinity control
Solution Approach 1:
The patent applies parameter changes by controlling the half-width of X-ray diffraction peaks to satisfy the relationship 9×W1 > W2 > W1 between the first and second layers. This crystallinity control parameter directly improves durability while maintaining the dense film structure achieved through chemical vapor deposition
Solution Approach 2:
The patent creates a composite ceramic structure with two distinct layers having different crystallinity characteristics. The first layer has broader diffraction peaks (W1) while the second layer has narrower peaks (W2), forming a composite structure that combines the benefits of both crystallinity levels to achieve both manufacturing precision and durability
2Reliability
If crystallinity is increased to improve durability, then reliability is improved, but residual stress increases leading to peeling and cracking
Solution Approach 1:
The patent applies local quality by creating different crystallinity characteristics in different regions (layers) of the ceramic structure. The first layer has different crystallinity than the second layer, allowing each region to be optimized for its specific function - the first layer provides structural foundation while the second layer provides enhanced durability without excessive stress
Solution Approach 2:
The patent controls the crystallinity parameter through X-ray diffraction half-width measurements, establishing the relationship 9×W1 > W2 > W1. This parameter control enables optimization of both durability and stress resistance by preventing excessive crystallinity growth that would cause residual stress
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 structure exhibits improved durability by reducing residual stress and thermal shock resistance, with enhanced crystallinity and reduced cracking, suitable for applications requiring high reliability.
Implementation Method 1
when a half-width of a peak of a Miller index of a maximum intensity of the first crystal particle in an X-ray diffraction of the first layer is defined as W1, and a half-width of a peak, the peak being the same as that of the Miller index of the second crystal particle, in an X-ray diffraction of the second layer is defined as W2
Data Source
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AI summary
The ceramic structure includes a first layer containing a first crystal particle and a second layer positioned on the first layer and containing a second crystal particle. The first crystal particle and the second crystal particle contain at least one metal element selected from the group consisting of Al, Si, Ti, Cr, Zr, and Y, and at least one non-metallic element selected from the group consisting of N, C, and B. The first crystal particle and the second crystal particle are identical compounds. When a half-width of a peak of a Miller index of a maximum intensity of the first crystal particle in an X-ray diffraction of the first layer is W1 and a half-width of a peak same as that of the Miller index of the second crystal particle in an X-ray diffraction of the second layer is W2, 9 × W1 > W2 > W1 is satisfied.