Skutterudite Thermoelectric Material Sintering Aid
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Solution Overview
Problem
Existing thermoelectric conversion materials face challenges in achieving high sinterability while maintaining a practical dimensionless figure-of-merit ZT, leading to increased processing costs and complex manufacturing processes.
Innovation Solution
A thermoelectric conversion material with a sintered body comprising a main phase with a skutterudite structure and a grain boundary containing a sintering aid phase of Mn, Sb, and O, which promotes sintering under normal pressure without the need for high-pressure sintering methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high-pressure sintering methods are used to improve sinterability, then sintering can be achieved, but processing costs increase and manufacturing complexity increases
Solution Approach 1:
A sintering aid phase comprising Mn, Sb, and O is introduced as an intermediary substance at grain boundaries to facilitate sintering under normal pressure. This sintering aid phase acts as a mediator that enables bonding between crystal grains without requiring high-pressure sintering equipment, thereby resolving the contradiction between achieving sinterability and avoiding manufacturing complexity
Solution Approach 2:
The invention changes the chemical composition parameters by incorporating specific elements (Mn, Sb, O) to form a sintering aid phase. This compositional modification enables the material to be sintered under normal pressure conditions, transforming the sintering process from requiring high pressure to operating under standard atmospheric conditions, thus reducing manufacturing complexity while maintaining sinterability
2Ease of manufacture
If high-pressure sintering methods are used to achieve sintering, then densification can be achieved, but processing costs increase
Solution Approach 1:
The sintering aid phase serves as a cost-effective intermediary that enables sintering under normal pressure conditions. By using this chemical mediator instead of expensive high-pressure equipment and processes, the invention achieves densification at lower processing costs, directly addressing the contradiction between sintering achievement and processing cost
Solution Approach 2:
The sintering aid phase acts as a consumable component that facilitates the sintering process and can be incorporated into the final material structure. This approach replaces expensive high-pressure processing with a more economical chemical additive strategy, reducing processing costs while achieving the desired sintering outcome
3Ease of manufacture
If sintering aid phase is added to improve sinterability, then sintering can be achieved under normal pressure, but material composition complexity increases
Solution Approach 1:
The sintering aid phase is localized specifically at grain boundaries rather than being uniformly distributed throughout the material. This local concentration of Mn, Sb, and O elements at critical interfaces enables sintering under normal pressure while minimizing the overall compositional complexity of the bulk material, resolving the contradiction between manufacturing ease and compositional simplicity
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 proposed method enhances sinterability, reduces processing costs, and maintains a practical dimensionless figure-of-merit ZT, resulting in a highly efficient thermoelectric conversion material suitable for thermoelectric conversion modules.
Implementation Method 1
a grain boundary between adjacent crystal grains, which comprises a sintering aid phase including at least Mn, Sb, and O
Implementation Method 2
When there is a temperature gradient from one side to the other of the thermoelectric conversion materials, in the n-type thermoelectric conversion material, electrons in a valence band in the high-temperature region are excited, which increases the number of electrons contributing to conduction, and the excited electrons are diffused into the low-temperature region so that there is an electric potential gradient
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A thermoelectric conversion material of the present invention comprises a sintered body including: a main phase including a plurality of crystal grains including Ce, Mn, Fe, and Sb and forming a skutterudite structure; and a grain boundary between crystal grains adjacent to each other, the grain boundary including a sintering aid phase including at least Mn, Sb, and O. Thus, with respect to a skutterudite-type thermoelectric conversion material including Sb, which is a sintering-resistant material, it is possible to improve sinterability while maintaining a practical dimensionless figure-of-merit ZT, and to reduce processing cost.