Phase Change Ceramic Foam for Extreme Heat Management
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Solution Overview
Problem
Current materials used in extreme environments, such as solid rocket motor nozzles and hypersonic control surfaces, suffer from significant erosion and recession, limiting their performance and duty cycles, and active cooling systems are not feasible due to weight and complexity penalties.
Innovation Solution
A reticulated foam structure comprising a first ceramic or metal composition with a second ceramic or metal composition disposed within, where one remains solid and the other undergoes a phase change from solid to liquid or vapor at a temperature below the phase change threshold, allowing for effective heat management and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon based composites are used in extreme environments, then structural applications are enabled, but significant erosion and recession occur through service life
Solution Approach 1:
The patent employs a composite material system consisting of a refractory ceramic matrix (such as alumina, silica, or mullite) combined with a phase change material (such as paraffin, microencapsulated phase change material, or salt-based eutectic). This composite structure enables the material to simultaneously achieve high-temperature structural stability and active heat management through phase change, thereby preventing erosion and recession while maintaining reliability in extreme environments.
Solution Approach 2:
The patent utilizes phase change (melting, freezing, or evaporation) of the second material to absorb or release heat energy at specific temperatures. This phase transition mechanism allows the composite to actively manage thermal loads, protecting the structural ceramic matrix from thermal degradation and preventing erosion, thus resolving the contradiction between structural stability and material loss.
2Temperature
If active cooling systems are added to manage heat flux, then heat management performance improves, but weight and complexity increase significantly
Solution Approach 1:
The patent implements a self-regulating thermal management system where the phase change material automatically absorbs excess heat during high-temperature exposure without requiring external cooling systems. The phase change occurs spontaneously when the material reaches its transition temperature, providing passive heat management that eliminates the need for complex active cooling mechanisms, thereby reducing weight and system complexity while maintaining effective temperature control.
3Use of energy by stationary object
If phase change material is added to ceramic structure, then heat energy is consumed through phase change, but structural integrity must be maintained
Solution Approach 1:
The patent applies local quality by confining the phase change material within specific regions or layers of the composite structure, such as embedding it in the ceramic matrix or placing it as a coating. This localized arrangement allows the phase change material to consume heat energy where thermal loads are highest while maintaining the overall structural integrity of the ceramic component. The ceramic matrix continues to provide mechanical strength while the phase change material provides thermal management in its designated locations.
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 solution enables materials to withstand extreme temperatures without erosion, maintaining structural integrity and managing heat energy through phase change, thereby extending performance and duty cycles in challenging environments.
Implementation Method 1
one of the first and second ceramic or metal compositions exhibits a phase change from a solid to either a liquid or vapor at a temperature below the phase change temperature threshold
Implementation Method 2
heat energy from the heat source is thereby consumed by the phase change
Implementation Method 3
compressing and heating the reticulated foam structure having the particles loaded therein to sinter and form a monolithic structure
Data Source
AI summary
An article is described that comprises a reticulated foam structure comprising a first ceramic or metal composition, and a second ceramic or metal composition disposed within the reticulated foam structure. The article may be compressed and sintered to form a monolith that can be used for mange heat by consuming heat energy through a phase change of one of the compositions.