Carbon Fiber Sheet
Carbon Fiber Sheet Product Description
Carbon fiber sheets are high-performance panels composed of carbon fiber-reinforced polymer (CFRP), where carbon fiber tows or fabrics are embedded in a resin matrix (e.g., epoxy or polyester) through high-temperature and high-pressure processes. Combining the strength of metals with the lightweight properties of engineering plastics, carbon fiber sheets have emerged as an ideal replacement for traditional metallic materials in modern industries.
The raw material for carbon fiber is polyacrylonitrile (PAN) or pitch-based fiber, which undergoes pre-oxidation, carbonization, and graphitization to form filaments with diameters of 5–10 micrometers. These fibers exhibit exceptional specific strength (strength-to-density ratio) and specific modulus, with individual carbon fibers achieving tensile strengths exceeding 4,900 MPa—5–10 times stronger than steel—while maintaining a density of just 1.7–2.0 g/cm³, approximately one-fourth that of steel. During manufacturing, fibers are aligned unidirectionally, woven, or layered with resin to create directionally reinforced sheets. Advanced techniques like autoclave curing and compression molding ensure structural uniformity and low porosity.
Carbon fiber sheets can be customized into standard, high-temperature-resistant, conductive, or impact-resistant variants. Additional surface treatments (e.g., coating, laminating) further enhance properties such as weather resistance, anti-static capabilities, or electromagnetic shielding.
| Parameter | Value/Description |
|---|---|
| Material Composition | Carbon fiber (PAN-based or pitch-based) + epoxy/polyester resin matrix |
| Density | 1.7–2.0 g/cm³ |
| Tensile Strength | ≥4,900 MPa |
| Elastic Modulus | 200–400 GPa (dependent on fiber orientation) |
| CTE (Axial) | 0.5×10⁻⁶/°C |
| Thermal Conductivity | 5–150 W/(m·K) (varies with fiber alignment and resin type) |
| Temperature Resistance | -50°C to 300°C (standard); high-temperature variants up to 500°C |
| Fatigue Strength (10⁷ cycles) | 70–80% of static strength |
| Corrosion Resistance | Resistant to acids, alkalis, and salt spray (5,000-hour ASTM B117 test compliance) |
| Electrical Conductivity | Resistivity: 1.5–2.5×10⁻³ Ω·cm (conductive variants) |
| Thickness Range | 0.1–50 mm |
| Standard Dimensions | 1,000×500 mm, 2,000×1,000 mm (customizable) |
Note: The values listed in the table are approximate and may vary depending on the specific product model and manufacturer. It is recommended to consult the product datasheet for accurate and detailed specifications.
Carbon Fiber Sheet Application
Aerospace
Carbon fiber sheets constitute over 50% of modern aircraft structures. Boeing’s 787 Dreamliner employs carbon fiber panels for its fuselage, reducing weight by 20% and improving fuel efficiency by 15% compared to aluminum. The European Space Agency’s Proba-V satellite uses carbon fiber framework, achieving a structural weight of under 1.2 kg/m² while maintaining rigidity.Electric Vehicles and Rail Transport
Tesla’s Cybertruck utilizes 12K carbon fiber sheets for underbody protection, meeting military-grade impact standards. CRRC Group’s carbon fiber train bogies reduce weight by 40%, enabling speeds up to 600 km/h. Battery enclosures made from carbon fiber sheets boost energy density by 8–12%.High-End Sports Equipment
Carbon fiber sheets redefine performance in sports: Wilson’s 3D-woven tennis rackets increase swing speed by 18%; Formula 1 monocoque chassis absorb 200 kJ/m² of collision energy; ultralight (0.5 mm) carbon fiber bicycle frames reduce total weight to 5.8 kg.Industrial and Medical Equipment
Semiconductor wafer-handling robots made with carbon fiber sheets minimize vibration (<0.1 μm), enhancing precision by three orders of magnitude. In healthcare, MRI-compatible carbon fiber beds eliminate metallic artifacts while supporting 300 kg/m² loads.Architecture and Renewable Energy
Dubai’s Solar Vertical Farm uses carbon fiber façade panels that withstand 50 kN/m² wind loads with 75% light transmittance. Vestas’ V236 wind turbine blades, reinforced with carbon fiber main beams, span 115.5 meters, boosting power output by 15%.
Carbon Fiber Sheet Advantages
Lightweight and High Strength
Carbon fiber sheets excel in delivering unparalleled strength-to-weight ratios. For instance, a 1 m² carbon fiber sheet weighs only 1.2–1.8 kg, whereas a steel plate of equivalent strength weighs 4–6 kg. This weight reduction is transformative in weight-sensitive applications. In electric vehicles, replacing steel with carbon fiber sheets can reduce body weight by 30–50%, significantly extending battery range.Superior Fatigue Resistance and Corrosion Tolerance
Carbon fiber sheets retain 70–80% of their static strength under cyclic loading, far exceeding the 30–50% typical of metals. In fatigue tests (10 Hz vibration frequency, 500 MPa stress amplitude), they withstand over 10 million cycles without failure. Their resistance to acids, alkalis, and salt spray makes them ideal for marine and chemical industries, with service lives three times longer than aluminum alloys.Design Flexibility and Functional Integration
By adjusting fiber orientation (e.g., 0°, ±45°, 90° layups) and resin formulations, carbon fiber sheets achieve tailored anisotropic properties. For example, wind turbine blades use 0° unidirectional layers for axial strength and ±45° layers for shear resistance. Functional integration—such as embedding sensors, conductive layers, or honeycomb cores—enables structural health monitoring and electromagnetic shielding.Thermal Stability and Low Expansion
With a thermal expansion coefficient of 0.5×10⁻⁶/°C (axial direction)—1/12 that of aluminum—carbon fiber sheets exhibit minimal dimensional changes (≤0.05%) across temperatures from -50°C to 150°C. Specialized variants with polyimide resin withstand prolonged operation at 300°C, making them suitable for satellite components and precision optical instruments.
Basic Physical Property Comparison
| Property | CFRP Plate (High-Strength) | Aluminum Alloy (7075) | High-Strength Steel (Q235) | Titanium Alloy (Ti-6Al-4V) | Glass Fiber Composite |
|---|---|---|---|---|---|
| Density (g/cm³) | 1.50–1.60 | 2.70–2.80 | 7.80 | 4.40–4.50 | 2.00–2.20 |
| Tensile Strength (MPa) | 3,500–7,000 | 420–572 | 420–1,000 | 900–1,200 | 1,000–1,400 |
| Elastic Modulus (GPa) | 200–700 | 69–79 | 200–214 | 110–120 | 40–73 |
| Elongation at Break (%) | 1.5–2.2 | 10–12 | 15–25 | 10–15 | 4.0–5.0 |
Manufacturing
Carbon fiber sheet production merges materials science, fluid dynamics, and automation:
Core Forming Processes:
Autoclave Molding: Remains aerospace gold standard. Prepreg (resin content controlled within ±2%) is laid per ply book design, vacuum-bagged, and cured under precise temperature ramps (e.g., 2°C/min), dwells (resin viscosity minimum), pressure (0.5–0.7 MPa), and cooling. Resin undergoes gelation and vitrification (Tg increase), forming crosslinked networks. High equipment cost, long cycle times.
Compression Molding: For high-volume, simple geometries. Sheet molding compound (SMC) or prepreg blanks are pressed in heated dies (5–20 MPa). Efficient but requires uniform pressure distribution.
Liquid Composite Molding (LCM):
Resin Transfer Molding (RTM): Dry fiber preforms are resin-injected (low-viscosity epoxies/vinyl esters) in closed molds. Suits complex double-sided finishes. High dimensional accuracy.
Vacuum-Assisted Resin Infusion (VARI): Dry fibers on single-sided molds are vacuum-bagged; resin infiltrates via negative pressure. Low equipment cost, ideal for large structures (e.g., wind turbine blades). Demands low resin viscosity (<300 cP) and optimized flow media.
Automation & Intelligence:
Automated Fiber Placement (AFP) & Tape Laying (ATL): Robotic multi-axis systems place prepreg tows/tapes onto molds via programmed paths. Enables efficient, low-waste fabrication of complex contours (e.g., aircraft fuselages, wings).
In-Process Monitoring: Embedded fiber Bragg grating (FBG) sensors track real-time temperature, strain, and resin flow. Ultrasonic C-scanning detects post-cure defects (porosity, delamination).
Post-Processing & Joining:
Machining: Requires diamond-coated or PCD tools with high spindle speeds, low depth-of-cut, high feed rates, and ample cooling. Waterjet cutting suits complex contours.
Joining: Adhesive bonding demands rigorous surface prep (grit-blasting/degreasing) and adhesive selection (e.g., epoxy films). Hybrid joining combines bonding with mechanical fasteners (titanium/composite fasteners) for reliability. Z-pinning/stitching enhances interlaminar toughness.
Conclusion
Carbon fiber sheets—crystalline unions of lightness and resilience—transcend mere materials to symbolize humanity’s relentless pursuit of extremes. They lift aircraft through the skies, propel race cars on circuits, empower athletes to transcend limits, and aid patients toward recovery. Each gram shed, each strength gained, each design breakthrough is materials science’s profound dialogue with the physical world.
FAQ
1.Q: How does the specific stiffness of carbon fiber boards surpass aluminum alloy?
A: Specific stiffness = 110 GPa·g⁻¹·cm³ — 4.2× higher than aluminum boards (26 GPa·g⁻¹·cm³).
- Q: What is the thermal expansion coefficient (CTE) of carbon fiber boards?
A: Unidirectional boards: Fiber direction CTE = -0.5–0.5×10⁻⁶/℃; Perpendicular direction CTE = 28×10⁻⁶/℃ (ASTM E831). - Q: What is the bending fatigue limit of carbon fiber boards?
A: T700/epoxy boards: ≥50% static strength after 10⁶ cycles (ISO 13003). - Q: How do carbon fiber board costs compare to titanium?
A: Unit area cost = 60% of titanium, with 1.8× higher specific strength.
Our Advantages
Complete set of tooling
Our carbon fiber products are manufactured using a variety of molds to ensure precision and consistency in the final product. We have multiple sets of molds designed to accommodate different shapes, sizes, and specifications of carbon fiber components.
High production capacity
Our carbon fiber products are manufactured with high production capacity, ensuring efficient and cost-effective mass production. We have invested in advanced equipment and technology to streamline the production process and maximize output.
High product precision
Our carbon fiber components are designed and engineered to meet the exacting requirements of various industries and applications. We utilize computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies to ensure precise measurements and cuts during the production process.
Catering to various customized processing needs
Our carbon fiber products are versatile and can cater to a wide range of customized processing needs. Whether it is for aerospace, automotive, sports equipment, or any other industry, our carbon fiber can be tailored to meet specific requirements.
