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What is the future research and development direction of advanced carbon fiber composites?
2021-02-19 15:07:23 visits:704
With the promulgation of made in China 2025, carbon fiber composites have entered a period of rapid development. The document clearly puts forward ten key development fields such as robots, aerospace equipment and new energy vehicles, and carbon fiber has different forms of applications in these fields.
Raw material technology is the basis and premise of the research and development of advanced carbon fiber composites
Raw materials such as matrix and reinforcement are the basis and premise for the development of advanced composites, and reinforced fiber technology is particularly important. Carbon fiber is a high-tech material developed rapidly in the 1960s, mainly including large tow carbon fiber represented by the United States and small tow carbon fiber represented by Japan.
Low cost technology is the fundamental means and way to expand the application of advanced composites
In the 21st century, the demand for advanced carbon fiber composites will grow faster, and its high cost has become an important bottleneck restricting the wide application of carbon fiber composites. Low cost carbon fiber composite technology has become a core problem in the research field of carbon fiber composites in the world. To improve the performance price ratio of advanced carbon fiber composites, in addition to research and improvement in raw materials, assembly and maintenance, it is more important to reduce the manufacturing cost of carbon fiber composites.
According to statistics, the manufacturing process cost of advanced carbon fiber composites accounts for more than 75% of the total cost. There is an obvious nonlinear relationship between the performance and cost of composite products. Sometimes 90% performance requires only 60% of the process cost, while the remaining 10% performance requires 40% of the cost.
In the past 30 years, the research and development of carbon fiber composites have focused on the improvement of material properties and process. At present, the focus is on the low-cost technology of advanced carbon fiber composites. The development and application of various low-cost technologies will be the mainstream of the development of composites, with the focus on the low-cost preparation technology and the optimization of preparation technology.
New carbon fiber composites are the trend and driving force of the sustainable development of advanced composites
The development of new aerospace is pursuing high efficiency, low cost, long life and high reliability, and the comprehensive requirements for its materials and structures are becoming higher and higher. In order to meet this application demand, some new carbon fiber composites came into being. Based on the existing material properties, we continue to tap the potential of advanced carbon fiber composites, such as ultra light materials and structure technology, strive to make it lighter, nanocomposites make it stronger and stronger, and pursue multi-function.
The integrated technology of design and evaluation is an important support and guarantee for the application of advanced carbon fiber composites
As a multiphase material (inclusion, matrix, interface, etc.), carbon fiber composites have significant and rich meso structural characteristics. Therefore, their macro properties, damage and failure laws depend not only on the characteristics of each component material, but also on the meso structural characteristics of composites, including inclusions (such as fiber, whisker, particle, crack, cavity, etc.) Volume fraction, shape, size, distribution law and interface form of.
Carbon fiber composites also have the characteristics of material structure process integration. Especially for multidirectional braided carbon fiber composites and filament wound advanced carbon fiber composites, the design and manufacture of component materials and structures include the simultaneity of three levels of component materials, composites and structures, and there is no finished product or intermediate product of carbon fiber composites. Therefore, the research idea of "design / evaluation" integration must be adopted in the research of carbon fiber composites.
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