Graphene Foam LTCC Composites for Homogeneous Microstructure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in developing graphene-ceramic composites lies in achieving homogeneous microstructure and predictable properties due to graphene agglomeration, anisotropic properties from 2D morphology, and the complexity of dispersion techniques, which hinder bulk-scale manufacturing and real-world applications.
Innovation Solution
The use of a 3D graphene foam as a filler material infiltrated with a sintered low-temperature co-fired ceramic matrix, allowing for superior microstructure control and uniform properties without the need for complex dispersion techniques, resulting in dense, high-strength composites with enhanced electrical and thermal conductivities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 2D graphene flakes are used as filler material, then electrical and thermal conductivity can be improved, but homogeneous distribution is difficult to achieve due to agglomeration and anisotropic properties
Solution Approach 1:
The patent transitions from 2D graphene flakes to 3D graphene foam architecture. This dimensional change eliminates the anisotropic alignment issues inherent in 2D flakes, providing isotropic electrical and thermal conductivity while enabling homogeneous distribution throughout the ceramic matrix without agglomeration problems.
Solution Approach 2:
The patent utilizes the porous structure of graphene foam with controlled pore sizes to achieve homogeneous distribution in the ceramic matrix. The porous architecture allows for uniform infiltration of ceramic slurry and prevents agglomeration while maintaining high surface area for property enhancement.
2Manufacturing precision
If complex dispersion techniques are used to achieve homogeneous graphene distribution, then microstructure homogeneity can be improved, but processing complexity and manufacturing cost increase
Solution Approach 1:
The patent performs preliminary action by pre-fabricating the 3D graphene foam structure before ceramic infiltration. This pre-formed 3D architecture inherently provides homogeneous distribution without requiring complex dispersion techniques during ceramic processing, simplifying the overall manufacturing workflow.
Solution Approach 2:
The patent extracts the problematic dispersion step from the processing sequence by using pre-formed 3D graphene foam. This eliminates the need for ball milling, sonication, and chemical functionalization that are required for 2D flakes, significantly reducing processing complexity and cost.
3Manufacturing precision
If high temperature and pressure are applied for ceramic densification, then ceramic density can be improved, but structural integrity of graphene foam may be compromised
Solution Approach 1:
The patent utilizes parameter changes by employing low-temperature co-fired ceramic (LTCC) processing conditions. This allows ceramic densification at temperatures that preserve the structural integrity of the 3D graphene foam, achieving both high ceramic density and maintained graphene architecture.
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 enables the creation of dense graphene foam ceramic composites with exceptional mechanical, thermal, and electrical properties, suitable for structural applications, while preserving the 3D interconnected architecture of graphene foam, thus overcoming the limitations of 2D graphene-based composites.
Implementation Method 1
an open cell graphene foam (GrF) surrounded by and infiltrated with a sintered low temperature co-fired ceramic (LTCC) matrix
Implementation Method 2
sintered low temperature co-fired ceramic (LTCC) matrix
Data Source
AI summary
A graphene foam ceramic composite (GrF-CC) comprises an open cell graphene foam (GrF) surrounded by and infiltrated with a sintered low temperature co-fired ceramic (LTCC) matrix. The GrF-CC can be prepared by infiltrating an open cell GrF with an LTCC slurry, removing the solvent from the slurry with solidification to a ceramic-GrF green body, and sintering the ceramic-GrF green body to form the GrF-CC. Sintering by spark plasma sintering (SPS) allows an LTCC GrF-CC that has a density of at least 90%.