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Electrical Conductivity in Graphite Foils Produced by Rolling and Pressing.
Nikolai S Morozov1, Vladimir A Shulyak1, Margarita G Isaenkova2
1Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia.
Materials (Basel, Switzerland)
|January 8, 2025
Summary
This study investigated how rolling and pressing affect flexible graphite foil conductivity. Optimized calculations revealed that micro-strains and secondary phases decrease conductivity, while texture sharpness influences anisotropy.
Area of Science:
- Materials Science
- Condensed Matter Physics
Background:
- Flexible graphite foils (GFs) are utilized in various applications requiring good electrical properties.
- The manufacturing process significantly influences the microstructure and properties of GFs.
- Understanding structure-property relationships is crucial for optimizing GF performance.
Purpose of the Study:
- To investigate the factors influencing the electrical conductivity of flexible graphite foils (GFs).
- To examine the relationship between electrical conductivity, texture, and structure in GFs produced by rolling or pressing.
- To correlate texture sharpness and substructural characteristics with electrical conductivity anisotropy.
Main Methods:
- Comparative analysis of GFs produced by rolling versus pressing.
- Microstructural characterization to assess texture and substructure.
- Measurement and analysis of electrical conductivity in different directions.
- Application of Kearns texture parameters for conductivity calculation.
Main Results:
- Electrical conductivity is significantly impacted by the forming process (rolling or pressing).
- A correlation exists between texture sharpness, electrical conductivity anisotropy, and substructural features.
- Increased micro-strains and the presence of a secondary phase substructure were found to reduce conductivity.
- Optimized electrical conductivity calculations were achieved by incorporating foil structural characteristics.
Conclusions:
- The forming method critically determines the electrical conductivity and anisotropy of flexible graphite foils.
- Microstructural features, including texture and substructure, are key determinants of GF electrical performance.
- The study provides a framework for optimizing GF production for specific electrical conductivity requirements.
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