Segmented Thermal Analyzer Sample Container
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Solution Overview
Problem
In thermogravimetry, the difference in radiation emissivity between the sample and reference samples leads to inconsistent heating states, affecting measurement accuracy, and existing heat shielding methods can inhibit thermal decomposition reactions by trapping self-generated atmospheres.
Innovation Solution
A sample container design with a bottomed cylindrical body and a disc-like cover portion that allows gas discharge during thermal decomposition, reducing radiation influence and maintaining the integrity of the thermal decomposition reaction, while also minimizing the impact of radiation from the heating furnace through optimized solid angle calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a heat shielding member is placed around the sample containers to reduce radiation influence, then measurement accuracy is improved, but thermal decomposition reactions are inhibited by trapping self-generated atmospheres
Solution Approach 1:
The heat shielding member is divided into multiple segments with gaps between them, allowing self-generated gases to escape while still providing radiation shielding. This segmentation resolves the contradiction by maintaining both measurement accuracy and reaction integrity simultaneously.
Solution Approach 2:
The heat shielding member has different properties in different regions: the main body provides radiation shielding while the gaps between segments allow gas permeability. This local differentiation of properties enables the structure to fulfill both functions of shielding and ventilation.
2Stability of the object's composition
If the sample container is completely sealed to prevent atmosphere mixing, then reaction integrity is maintained, but radiation effects from the heating furnace increase
Solution Approach 1:
The container structure incorporates segmented heat shielding members with controlled gaps, creating a semi-sealed environment that maintains reaction integrity while allowing partial radiation shielding. The segmentation enables selective permeability to both gas and radiation.
Solution Approach 2:
The heat shielding member acts as an intermediary structure between the sample and the heating furnace, providing radiation protection while its segmented design allows gas exchange. This intermediary structure mediates between the conflicting requirements of sealing and shielding.
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 design enhances the measurement accuracy of thermogravimetry by reducing radiation effects and preventing the inhibition of thermal decomposition reactions, ensuring precise and accurate thermal analysis without spoiling the sample's reaction environment.
Implementation Method 1
In a high temperature range, heat transfer by radiation is more dominant than heat conduction from the heating furnace
Implementation Method 2
thermal decomposition of a sample during thermogravimetry involving a thermal decomposition reaction
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A sample container of a thermal analyzer that performs thermogravimetry or calorimetry includes a bottomed cylindrical body portion and a cover portion abutting against an opening of the body portion and covering at least a part of the opening. The cover portion includes a first cover portion abutting against an edge portion of the opening and having a second opening in a part of the first cover portion, and a second cover portion separated from the first cover portion in an axial direction of the body portion so as to cover at least a part of the second opening.