The carbon fiber industry has witnessed a landmark achievement. The 'Key Technology and Industrialization of Wet-Process High-Performance Carbon Fiber' project, jointly undertaken by Zhongjian Technology, Donghua University, Harbin Institute of Technology, Nanjing Tech University, and Xi'an Furida, has recently passed a technological appraisal organized by the China National Textile and Apparel Council. The overall technology was assessed as reaching world-leading levels. This recognition means that domestic carbon fiber has entered the global first tier in core performance and scale-up capability.
Technological Breakthrough: From 'Strong' to 'Uniform'
Wet spinning is the mainstream process route for aerospace-grade carbon fiber, irreplaceable in high-end applications. However, traditional wet processes tend to generate internal defects when speed is increased, which has been a core bottleneck limiting the mass production of ultra-high-performance fibers. The project achieved breakthroughs through three key technologies:
- Developed controlled synthesis technology for narrow molecular weight distribution, establishing a rapid solidification dual-diffusion control mechanism to achieve controllable crystal grain size in precursor fibers.
- Established balanced control of nano-defects and microcrystal size, developed rapid homogeneous pre-oxidation and carbonization processes to effectively suppress skin-core structures, resulting in carbon fiber with tensile strength of 6600 MPa and tensile modulus of 335 GPa.
- Invented multi-stage electrochemical oxidation coupling and gradient interface technology to improve the interfacial bonding between fiber and matrix.
What do these indicators mean? The tensile strength of 6600 MPa already surpasses most T800-grade products on the market, while the modulus of 335 GPa approaches that of high-modulus carbon fibers. For downstream aerospace users, this means the ability to bear greater loads at the same weight, or achieve lighter structural designs under the same load.
Equipment and Capacity: Independent Design with 5000 Tons Annual Output
The project achieved breakthroughs not only in processes but also in equipment autonomy. The team innovatively designed large-channel external heating pre-oxidation furnaces and multi-temperature zone integrated carbonization furnaces, solving the challenge of long-term stable operation while significantly reducing total energy consumption. The project has now established a stable production capacity of 5000 tons per year of wet-process high-performance carbon fiber, with products already applied at scale in aviation and aerospace sectors.
An annual capacity of 5000 tons is a substantial scale in the domestic high-performance carbon fiber field. Previously, most domestic capacity was at the kiloton level, with some core equipment relying on imports. This project's realization of independent design from core processes to key equipment means a substantial improvement in supply chain security for domestic carbon fiber.
Intellectual Property and Standards Influence
The project has accumulated 25 invention patents and 30 utility model patents, and participated in the formulation of one national standard. The IP portfolio covers the entire chain from precursor preparation, carbonization processes, to surface treatment and equipment design. Participation in national standard setting indicates that the technology route has gained industry-level recognition and may serve as a benchmark for future industrialization.
For carbon fiber buyers, this is a signal worth watching. In the past, high-end carbon fiber relied heavily on overseas suppliers such as Toray and Hexcel, with high prices and supply affected by geopolitical factors. With domestic technological breakthroughs and capacity release, both bargaining power and supply stability are expected to improve.
Industry Impact and Challenges
This breakthrough has clear ripple effects across the carbon fiber supply chain. Upstream, the controlled synthesis technology for narrow molecular weight distribution can be extended to other high-performance fiber varieties. Midstream, the rapid homogeneous pre-oxidation and carbonization process could lower energy costs. Downstream, the validation of domestic carbon fiber in aerospace will accelerate penetration into civilian fields such as wind turbine blades, pressure vessels, and sports equipment.
However, caution is still needed. The appraisal result is a recognition of technical capability, but there remains a step from the lab to stable bulk supply, requiring engineering validation. In addition, indicators such as batch consistency and long-term fatigue performance need more data accumulation in real-world applications.