Key Takeaways & Executive Findings
- •• A one-step consolidation process enables rapid fabrication of low-density C/C composites with a mesophase pitch binder and graphite flake filler. • The composite achieves an EMI SE of 83.97 dB in the X-band, attributed to open pores and a continuous conductive network. • The material exhibits a thermal conductivity of 191.84 W·m−1·K−1 and an electrical conductivity of 6.50 × 10^4 S·m−1 along the fiber direction. • The composite maintains a flexural strength exceeding 100 MPa with a bulk density of only 1.01 g·cm−3, offering a short-cycle strategy for multifunctional applications.
Abstract
Carbon/carbon (C/C) composites are ideal materials for electromagnetic interference (EMI) shielding and thermal management in the aerospace field because of their low density. However, traditional C/C composites primarily rely on repeated densification to increase their EMI shielding effectiveness (SE), which not only increases density but also involves lengthy preparation cycles. We have constructed a unidirectional (1D) C/C composite using a matrix of mesophase pitch-derived carbon and graphite flakes, reinforced with mesophase pitch-based carbon fibers. Using a one-step consolidation process produced by spontaneous assembly during heating, the open pores and a continuous conductive network give the composite an EMI SE of up to 83.97 dB in the 8.2–12.4 GHz (X-band). The material also has a thermal conductivity of 191.84 W·m−1·K−1 and an electrical conductivity of 6.50 × 104 S·m−1 along the fiber direction, together with a flexural strength exceeding 100 MPa, while having a bulk density of only 1.01 g·cm−3. This work therefore presents a short-cycle fabrication strategy for low-density C/C composites that integrate high EMI SE, efficient thermal management, and good mechanical properties.
1. Introduction
The rapid advancement of emerging technologies, including fifth-generation (5G) mobile communications, artificial intelligence (AI), the Internet of Things (IoT), and new energy vehicles, is propelling an evolution in electronic devices toward higher power density, greater integration, and miniaturization. This trend, however, results in significant heat accumulation and continuously rising thermal flux density during the operation of devices, while electromagnetic interference (EMI) has also become increasingly severe. Traditional single-function materials, which often provide only limited shielding capabilities, fail to meet these stringent multifunctional requirements. Therefore, creating structurally integrated composites that simultaneously offer excellent EMI shielding effectiveness (SE), efficient thermal management, and mechanical reliability has become a vital research goal, key to advancing next-generation electronics.
Owing to their lightweight nature, excellent corrosion resistance, and ability to withstand high temperatures, carbon-based materials stand out among mainstream EMI shielding options such as metals and conductive polymers. This makes them particularly suitable for weight-sensitive applications including satellites, aerospace vehicles, and automobiles, where their low density offers a distinct advantage. However, conventional carbon materials (e.g., carbon foams and aerogels) often suffer from poor mechanical properties, limiting their application as structural components. To address this issue, carbon/carbon (C/C) composites reinforced with high-strength carbon fibers have gained prominence. These composites exhibit exceptional properties, including high-temperature resistance, high specific strength, and high specific modulus. Notably, after high-temperature graphitization, C/C composites exhibit metal-like thermal and electronic conductivity. Conventional fabrication processes for C/C composites, including multi-cycle chemical vapor infiltration (CVI), polymer infiltration and pyrolysis (PIP), and high-temperature hot pressing, achieve EMI shielding primarily through surface reflection. This mechanism depends critically on forming continuous conductive networks on the material surface, which requires substantial increases in bulk density. For instance, Xue et al. reported an exceptional EMI SE of ~80 dB in the X-band for C/C composites, achieved at a bulk density of 1.85 g·cm−3 by repeated CVI and PIP densification followed by 3000 °C graphitization. However, this approach involves lengthy preparation cycles and increased density, highlighting the need for a more efficient fabrication strategy.
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Luo Pengfei, Tian Shan, Guo Fengjun, Xiao Zhichao (2025). Rapidly fabricated carbon/carbon composites with a mesophase pitch binder and graphite flake filler with excellent EMI shielding and thermal conductivity. SinoTechIntel Verified Research. https://doi.org/10.1016/S1872-5805(NCM2026-41-03-05)
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Frequently Asked Questions
What is the main innovation of this research?
The main innovation is the development of a one-step consolidation process for fabricating low-density carbon/carbon composites with a mesophase pitch binder and graphite flake filler, achieving high EMI shielding and thermal conductivity without repeated densification cycles.
What are the key performance metrics of the composite?
The composite exhibits an EMI SE of 83.97 dB in the X-band, a thermal conductivity of 191.84 W·m−1·K−1, an electrical conductivity of 6.50 × 10^4 S·m−1 along the fiber direction, a flexural strength exceeding 100 MPa, and a bulk density of only 1.01 g·cm−3.
How does the fabrication process differ from traditional methods?
Traditional methods require multiple cycles of chemical vapor infiltration or polymer infiltration and pyrolysis, which are time-consuming and increase density. The new method uses a one-step consolidation process with spontaneous assembly during heating, significantly reducing preparation time and maintaining low density.
What applications could benefit from this composite?
The composite is suitable for weight-sensitive applications in aerospace, satellites, and automobiles, where both EMI shielding and thermal management are critical, such as in electronic enclosures, heat sinks, and structural components.
What is the significance of the low density in this composite?
Low density is crucial for aerospace and automotive applications to reduce weight and improve fuel efficiency. The composite achieves a density of 1.01 g·cm−3, which is significantly lower than traditional C/C composites (e.g., 1.85 g·cm−3), while still providing excellent mechanical and functional properties.
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