Al-Modified Skutterudite Thermoelectric Material
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Solution Overview
Problem
Thermoelectric materials, particularly skutterudite compounds, experience performance degradation due to long-term storage of powders during the industrial production process, leading to inefficiencies in energy conversion.
Innovation Solution
Incorporating a small amount of Al into the sintering process of p-type skutterudite powders to generate AlSb, which reduces the formation of FeSb2, a component that degrades thermoelectric performance, by adjusting the molar ratios and sintering conditions to optimize the content of AlSb and FeSb2 within the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If skutterudite powder is mass-produced and stored for long-term before sintering, then production economy is improved, but thermoelectric performance degrades due to formation of FeSb2
Solution Approach 1:
The patent applies preliminary action by adding Al powder to the skutterudite powder before storage. This preliminary addition of Al prevents the formation of FeSb2 during long-term storage, thereby maintaining thermoelectric performance while still allowing for economical mass production and long-term storage of the powder before sintering.
Solution Approach 2:
The patent uses Al as an intermediary substance that reacts with excess Fe during storage to prevent FeSb2 formation. The Al acts as a mediator that protects the thermoelectric performance by controlling the chemical reactions that would otherwise degrade the material during long-term storage before sintering.
2Reliability
If Al is added to prevent FeSb2 formation, then thermoelectric performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the Al addition amount to a specific range (0.1-5 wt% based on total powder weight). This controlled parameter change prevents excessive Al from forming AlSb compounds that would also degrade performance, while still effectively preventing FeSb2 formation. The simplified manufacturing process involves only adding Al powder and sintering, without requiring complex additional steps.
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 approach minimizes the content of degrading components, thereby enhancing the thermoelectric performance and stability of the material, as demonstrated by improved electrical conductivity, Seebeck coefficient, and thermal diffusivity measurements.
Implementation Method 1
Incorporating a small amount of Al into the sintering process of p-type skutterudite powders to generate AlSb, which reduces the formation of FeSb2
Implementation Method 2
These thermoelectric materials are metal or ceramic materials having a function to directly convert heat to electricity or inversely convert electricity to heat
Implementation Method 3
These thermoelectric materials are metal or ceramic materials having a function to directly convert heat to electricity or inversely convert electricity to heat
Data Source
AI summary
A thermoelectric material which minimize the content of components that degrade thermoelectric performance and thus can be usefully used in thermoelectric devices including the same.