Thermal Analysis Sample Transfer for Low-Dew-Point Sealing
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Solution Overview
Problem
Existing thermal analysis methods face challenges in maintaining a controlled atmosphere with low dew points and preventing exposure to the atmosphere during sample transfer, particularly in the analysis of battery materials, due to issues with seal integrity and the need for larger gloveboxes, which increase costs and prolong analysis setup times.
Innovation Solution
A thermal analysis system with a sample preparation means that maintains a controlled atmosphere using a vacuum and gas supply system, combined with a sample holder and transfer mechanism that ensures sealed sample transfer, allowing for differential thermal analysis and maintaining a dew point below -80°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If samples are transferred from glovebox to heating analysis device, then thermal analysis can be conducted, but sample exposure to atmosphere occurs and seal integrity is compromised
Solution Approach 1:
A transfer chamber is introduced as an intermediary space between the glovebox and heating analysis device. The transfer chamber maintains a controlled atmosphere (inert gas or vacuum) and provides a sealed environment for sample transfer. The sample moves through this intermediate zone without direct exposure to the external atmosphere, preserving seal integrity while enabling operational transfer.
Solution Approach 2:
The sample vessel is designed with nested structures where an inner sealed container holds the sample, which can be transferred independently from the outer vessel. This allows the inner container to be sealed within the glovebox atmosphere and then transferred to the heating device without breaking the seal, solving both the transfer operation and seal integrity requirements.
2Reliability
If indium or gallium is used to seal sample vessel in glovebox, then sealing is achieved, but melting of seal occurs during heating analysis and gas analysis becomes impossible
Solution Approach 1:
The sealing material is changed from low-melting-point indium or gallium to high-temperature resistant materials such as metal seals (e.g., Kovar, Invar) or ceramic seals. This parameter change in material composition allows the seal to maintain integrity at the elevated temperatures required for thermal analysis and gas generation, preventing premature seal failure.
Solution Approach 2:
A composite sealing structure is employed combining multiple materials with complementary properties. For example, a metal-ceramic composite seal or a multi-layer seal structure that provides both sealing capability at room temperature and thermal stability at high temperatures. This composite approach resolves the contradiction between initial sealing reliability and high-temperature resistance.
3Ease of operation
If glovebox size is increased to accommodate larger sample vessels, then sample transfer is easier, but system cost and setup time increase
Solution Approach 1:
The system is segmented into separate functional modules: a compact glovebox for sample preparation, a transfer chamber for controlled atmosphere transfer, and the heating analysis device. This segmentation allows each component to be optimized independently, maintaining ease of operation while reducing the overall size and complexity of any single component, particularly the glovebox.
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
Enables efficient and controlled thermal analysis of samples while minimizing atmospheric exposure, reducing setup time, and maintaining a low dew point environment, thus improving the accuracy and efficiency of thermal analysis.
Implementation Method 1
a pump means drawing vacuum in the internal space of the sample preparation means (10) and in the heating tube (210)
Implementation Method 2
a gas supply means supplying gas to the internal space of the sample preparation means (10) and in the heating tube (210), while maintaining the dew point temperature at or below -80°C
Implementation Method 3
a heating means (220) heating the heating tube (210)
Data Source
Figure 1~2
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AI summary
A thermal analysis system (100) according to the present invention comprises a sample preparation means (10) and a thermal analysis means (20). The sample preparation means (10) comprises a walled means (110) circumscribing an internal space, an aperture means (110a) provided in said walled means (110) having an openable and closable gate means (111), a sample holder (121), a temperature sensor (122), a sample holding member (120), a transfer mechanism (130) for transferring the sample holder (121) into the thermal analysis means (20), a sealing mechanism (140) for sealing the sample holder (121) in the internal space of the sample preparation means (10) and a heating of the thermal analysis means (20). The thermal analysis means (20) comprises a coupling mechanism (150) coupling the heating tube (210) to the gate means (111) while sealing the heating tube (210) from the outside. A heating means (220) for heating the heating tube (210) is provided.