Ceramic Substrate Thermal Boundaries for Heat Zone Isolation
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Solution Overview
Problem
Existing thermal management systems in vacuum flasks and spaceflight assemblies fail to effectively isolate temperature-sensitive components from heat sources, leading to performance degradation and the need for oversized components to mitigate temperature extremes.
Innovation Solution
Incorporating poor thermal conductors like titanium porcelain into machined cavities of ceramic substrates during fabrication, creating thermal boundaries that isolate cold and warm regions and protect sensitive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermal management systems are used in vacuum flasks, then heat transfer between thermal zones occurs, but temperature-sensitive components cannot be effectively isolated from heat sources
Solution Approach 1:
The substrate is divided into multiple thermal zones separated by thermal boundaries. Low thermal conductivity material is inserted into cavities to create distinct thermal regions, allowing temperature-sensitive components to be isolated from heat sources while maintaining electrical connectivity through conductive pathways.
Solution Approach 2:
Different regions of the substrate are given different thermal properties. The bulk substrate material provides thermal conduction pathways, while specific cavity regions are filled with low thermal conductivity material to create thermal barriers. This local differentiation of thermal properties enables precise thermal management for specific components.
2Reliability
If thermal boundaries are created by inserting low thermal conductivity material into cavities, then thermal isolation is improved, but device complexity increases
Solution Approach 1:
Cavities are formed in the substrate at predetermined locations before final assembly. Low thermal conductivity material is pre-prepared and then inserted into these cavities during the substrate fabrication process. This preliminary preparation of cavity locations and the integration of thermal boundary material during manufacturing simplifies the overall process compared to post-fabrication modifications.
Solution Approach 2:
The low thermal conductivity material acts as an intermediary element between the substrate material and the components. It provides thermal isolation while allowing the substrate to maintain its structural and electrical functions. This intermediary approach enables thermal management without fundamentally redesigning the entire substrate architecture.
3Reliability
If thermal boundaries are implemented, then heat transfer is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Cavity locations and dimensions are predetermined during the substrate design phase. These cavities are formed as integral parts of the substrate fabrication process, ensuring consistent positioning and dimensions. The preliminary definition of cavity parameters guides subsequent material insertion and ensures proper alignment with thermal management 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
Effectively isolates temperature-sensitive components, reducing the need for oversized components and enhancing thermal management by limiting heat transfer between different temperature zones.
Implementation Method 1
disposing a material having a characteristic thermal conductivity that is substantially less than that of the substrate in the first and second cavities
Data Source
AI summary
A method of creating thermal boundaries in a substrate is provided. The method includes forming the substrate with first and second sections to be in direct thermal communication with first and second thermal elements, respectively, machining, in the substrate, first and second cavities for defining a third section of the substrate between the first and second sections and disposing a material having a characteristic thermal conductivity that is substantially less than that of the ceramic in the first and second cavities.