Ceramic Matrix Composite Plies for Localized Property Tailoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ceramic matrix composites (CMCs) lack the ability to tailor localized properties, such as mechanical, thermal, and electrical conductivity, which are essential for high-temperature applications like gas turbines, where uniformity and stress management are critical.
Innovation Solution
The method involves a layup of ceramic fibers with different properties, where specific plies are strategically placed to create regions with varying fiber volume fractions, matrix compositions, and orientations, allowing for localized control of mechanical, thermal, and electrical properties through curing and pyrolysis processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uniform ceramic matrix composite structure is used, then manufacturing simplicity is maintained, but ability to tailor localized properties (mechanical, thermal, electrical conductivity) is lost
Solution Approach 1:
The patent applies local quality by varying fiber volume fraction, fiber orientation, and matrix composition in different regions of the composite structure. Specific plies have different properties than adjacent plies, allowing localized tailoring of mechanical, thermal, and electrical conductivity properties to meet specific performance requirements in different areas of the component.
Solution Approach 2:
The composite structure is segmented into multiple plies with different properties. Each ply can have distinct fiber volume fractions, orientations, and matrix compositions. This segmentation allows independent optimization of each layer's properties while maintaining overall structural integrity, resolving the contradiction between adaptability and manufacturing complexity.
2Temperature
If ceramic matrix composite is designed for high-temperature applications, then temperature resistance is improved, but stress management capability deteriorates due to uniform structure
Solution Approach 1:
Different plies are designed with specific properties to manage stress locally. Plies with higher fiber volume fractions or specific fiber orientations are placed in regions requiring enhanced stress resistance, while other plies optimize for thermal resistance. This local quality variation allows simultaneous optimization of both temperature resistance and stress management throughout the structure.
Solution Approach 2:
The patent uses composite materials with varying fiber types, volumes, and orientations within different plies. By combining multiple material configurations in a single structure, it achieves both high-temperature resistance and improved stress management capability through the synergistic effect of differentiated plies.
3Strength
If fiber volume fraction is increased to improve mechanical strength, then crack growth prevention is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
Instead of requiring uniform high fiber volume fraction throughout the entire structure, the patent segments the design into plies with different fiber volume fractions. This allows high fiber content in plies where crack growth prevention is critical, while other plies can have lower fiber content that is easier to manufacture with high precision, thereby reducing overall manufacturing precision requirements.
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
This approach enhances the lifespan of CMCs by preventing crack growth and tailoring properties to manage stress and thermal gradients, improving mechanical response and thermal conductivity, thereby optimizing the performance of components like turbine blades and vanes.
Implementation Method 1
the ceramic matrix protects the reinforcement material, maintains the orientation of its fibers, and serves to dissipate loads to the reinforcement material
Implementation Method 2
the layup of plies is cured and pyrolyzed to form a green body, which is then densified to form the ceramic matrix composite article
Data Source
Figure 1~4
Figure 5~7
Figure 8
AI summary
Ceramic matrix composite articles include, for example a first plurality of plies of ceramic fibers in a ceramic matrix defining a first extent, and a local at least one second ply in said ceramic matrix defining a second extent on and/or in said first plurality of plies with the second extent being less than said first extent. The first plurality of plies has a first property, the at least one second ply has at least one second property, and said first property being different from said at least one second property. The different properties may include one or more different mechanical (stress/strain) properties, one or more different thermal conductivity properties, one or more different electrical conductivity properties, one or more different other properties, and combinations thereof.