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[Study on spectral emissivity of C/C composites]
Bo Zhu1, Wei-Wei Cao, Min Jing
1Carbon Fiber Center, Institute of Polymer Materials, School of Materials Science and Engineering, Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Ji'nan 250061, China. zhubo1969@yahoo.cn
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|January 28, 2010
Summary
Carbon fiber reinforced carbon composites with short cut fibers exhibit higher spectral emissivity and better heat radiation. Resin carbon also shows enhanced emissivity due to its microstructure.
Area of Science:
- Materials Science
- Solid-state Physics
- Spectroscopy
Context:
- Carbon/carbon (C/C) composites are advanced materials with applications requiring high-temperature performance.
- Understanding their radiative properties, specifically normal spectral emissivity, is crucial for thermal management and design.
- Variations in microstructure significantly influence these radiative properties.
Purpose:
- To investigate and compare the normal spectral emissivity of different C/C composite types.
- To correlate microstructural characteristics with spectral emissivity and heat radiation properties.
- To analyze the impact of fiber reinforcement and carbon source (resin vs. fiber) on emissivity.
Summary:
- C/C composites reinforced with short cut carbon fibers demonstrated higher normal spectral emissivity across the 2500-13000nm wavelength range compared to those reinforced with carbon cloth.
- The looser structure and lower particle density of short cut fibers enhance electromagnetic wave penetration, leading to superior emissivity and heat radiation.
- Resin-derived carbon exhibited higher spectral emissivity than fiber-derived carbon due to microstructural differences, including more vibration modes in sp3 and sp2 hybridized carbon atoms, confirmed by Laser Raman spectroscopy.
Impact:
- Provides fundamental insights into tailoring C/C composite microstructures for optimized thermal radiation.
- Informs material selection and design for high-temperature applications where radiative heat transfer is critical.
- Highlights the role of specific carbon structures (short cut fibers, resin carbon) in enhancing emissivity for improved thermal performance.
