Reinforced Ceramic Matrix Composites with Helical Preforms
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Solution Overview
Problem
Existing methods for forming ceramic matrix composites face challenges such as fiber breakage and damage during compression, which adversely impact mechanical properties like interlaminar shear and tensile strength, particularly in high-temperature applications.
Innovation Solution
A method involving a second preform with a helical surface portion, such as a compression spring, is inserted into a first preform, promoting helical deformation to accommodate compressive loads and reduce fiber damage during matrix infiltration, using techniques like chemical vapor infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional compression methods are used to form ceramic matrix composites, then the manufacturing process can be completed, but fiber breakage and damage occur which adversely impact mechanical properties like interlaminar shear and tensile strength
Solution Approach 1:
The invention introduces a helical surface portion on the compression tooling that dynamically deforms during compression, converting linear compressive force into rotational motion. This dynamic helical deformation allows the fibers to spiral and reorient themselves during compression, preventing fiber breakage while still achieving the necessary compactness for matrix infiltration. The helical geometry transforms the static compression process into a dynamic one where fibers can adapt their configuration.
Solution Approach 2:
The invention changes the geometric parameter of the compression tooling by introducing a helical surface portion with specific pitch and diameter ratios. This parameter change transforms the compression mechanism from direct linear compression to helical deformation. The helical pitch and diameter are carefully controlled to ensure that the deformation is sufficient to prevent fiber breakage while maintaining the structural integrity needed for high interlaminar shear and tensile strength.
2Productivity
If compression is applied to the preform during matrix infiltration, then the matrix can be properly infiltrated, but fiber damage occurs which reduces mechanical properties
Solution Approach 1:
The helical surface portion on the compression tooling creates dynamic helical deformation during compression. This dynamic deformation allows the fiber structure to spiral and reorient itself in response to the compressive force, enabling the matrix to infiltrate properly while the fibers remain intact through controlled geometric transformation rather than direct compression damage.
Solution Approach 2:
The helical surface portion acts as an intermediary mechanism between the compressive force and the fiber structure. Instead of directly compressing the fibers which causes damage, the helical surface mediates the force transmission, converting it into rotational/helical deformation that the fibers can accommodate without breaking, thus enabling both infiltration and fiber integrity.
3Strength
If a helical surface portion is inserted into the preform, then fiber breakage is reduced and mechanical properties are enhanced, but the device complexity increases
Solution Approach 1:
The helical surface portion is nested within the existing preform structure during compression. The helical geometry is integrated into the compression tooling that works with the preform, effectively nesting the helical deformation mechanism within the existing manufacturing process. This nesting approach enhances fiber strength while minimizing the addition of separate complex components.
Solution Approach 2:
The helical surface portion serves multiple functions: it acts as a compression tooling element, creates helical deformation to prevent fiber breakage, and facilitates matrix infiltration. By making the compression tooling multi-functional with the helical surface, the invention enhances mechanical properties without requiring entirely separate complex devices, as the same tooling performs multiple roles in the manufacturing process.
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 method reduces fiber breakage and enhances interlaminar shear and tensile strength, resulting in improved mechanical properties for ceramic matrix composites suitable for high-temperature applications.
Implementation Method 1
The first preform with the inserted second preform is infiltrated with a matrix material comprising a ceramic to form the ceramic matrix composite
Implementation Method 2
The method may include pyrolyzing the organic polymer resin after compression and before infiltrating the matrix material
Data Source
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AI summary
A method of making a ceramic matrix composite is disclosed. According to the method, a first preform (100) comprising fibers is formed, and a second preform (120) including a helical surface portion is inserted into the first preform (100). The first preform (100) with the inserted second preform (120) is infiltrated with a matrix material (190) comprising a ceramic to form the ceramic matrix composite. A ceramic matrix composite is also disclosed. The ceramic matrix composite includes a first portion including a matrix (190) comprising a ceramic, and a reinforcement including fibers derived from the first preform (100) in the matrix. A second portion including a helical surface portion interface with the first portion is disposed within the first portion.