Thermoelectric Alloy Carburization for High Figure-of-Merit
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Solution Overview
Problem
Conventional thermoelectric materials have limited thermoelectric figure-of-merit, restricting their application in heat dissipation and efficiency, as they typically have a figure-of-merit around 1.0, which is not sufficient to replace compressors, and existing methods do not effectively enhance their properties.
Innovation Solution
A method involving a carburization process where a carburizing agent decomposes to generate active carbon atoms that diffuse into an oxidized thermoelectric alloy, composed of materials like germanium, tellurium, bismuth, and others, to improve thermoelectric properties by reducing thermal conductivity and increasing the power factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermoelectric materials are used, then the material can be applied in waste heat recovery, but the thermoelectric figure-of-merit is limited to about 1.0, restricting application scope and efficiency
Solution Approach 1:
The patent changes the chemical composition parameters by introducing carbon atoms into the thermoelectric alloy through carburization process. This parameter change transforms the material properties, achieving a thermoelectric figure-of-merit of about 2.0, which doubles the performance of conventional materials and enables broader applications including heat dissipation systems that previously required compressors
Solution Approach 2:
The patent creates a composite thermoelectric material by combining conventional thermoelectric alloy elements (such as Bi-Te, Pb-Te, or Si-Ge systems) with carbon atoms. This composite structure, achieved through the carburization process, integrates the beneficial properties of both the base alloy and carbon, resulting in improved thermoelectric performance and expanded application versatility
2Adaptability or versatility
If the thermoelectric figure-of-merit is increased to replace compressors for heat dissipation, then application scope expands, but conventional materials cannot achieve the required performance level
Solution Approach 1:
The patent achieves the critical parameter change needed to enable compressor replacement applications by introducing carbon atoms into the thermoelectric alloy. This compositional modification increases the thermoelectric figure-of-merit to about 2.0, which is sufficient for heat dissipation applications that require high performance, thereby expanding the adaptability of thermoelectric materials to replace mechanical compressor systems
3Ease of manufacture
If existing production methods are used, then the manufacturing process is simple, but the thermoelectric properties cannot be effectively enhanced
Solution Approach 1:
The patent modifies the manufacturing process parameters by implementing a carburization treatment step. This involves heating the thermoelectric alloy to appropriate temperatures and exposing it to a carbon-containing atmosphere, allowing carbon atoms to diffuse into the material. This parameter change in the manufacturing process effectively enhances the thermoelectric properties while maintaining reasonable manufacturing complexity
Solution Approach 2:
The patent introduces a carburizing agent as an intermediary substance in the manufacturing process. This agent provides the carbon atoms needed for the carburization treatment, mediating between the external environment and the thermoelectric alloy. The intermediary approach allows for controlled introduction of carbon, effectively enhancing thermoelectric properties through a manageable manufacturing process
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 method significantly enhances the thermoelectric figure-of-merit of the alloy, achieving values twice that of commercial alloys, thereby improving thermoelectric conversion efficiency and expanding application possibilities.
Implementation Method 1
A carburizing agent decomposes on heating to generate active carbon atoms during a carburization process
Implementation Method 2
the active carbon atoms can diffuse into an as-melted thermoelectric alloy material
Implementation Method 3
A starting material is provided and subjected to an oxidation process for producing an oxidized material composition
Data Source
Figure 1
Figure 2A~2B
AI summary
The present invention relates to a thermoelectric alloy and a method for producing the same. A starting material is firstly provided, and an oxidation process is performed to the starting material to obtain an oxidized material composition. Then, the oxidized material composition and a carburizing agent are added into a quartz tube, and a sealing process is performed to the quartz tube. And then, the sealed quartz tube is subjected to a carburization process, thereby obtaining the thermoelectric alloy with excellent thermoelectric figure-of-merit.