Blades are the key components of wind turbines and involve structural, pneumatic, and technological fields. The length of the blade is proportional to the power of the fan. The larger the power, the longer the blade. As the existing materials can not meet the needs of high-power wind power generation devices, the performance of glass fiber composite materials has reached the limit. Therefore, when developing higher power wind power generation devices and longer rotor blades, better performance carbon fiber composites are used. Material is imperative. When the blade exceeds a certain size, the carbon fiber blade is cheaper than the glass fiber blade, because the amount of materials, labor, transportation and installation costs have decreased.
Yan Bing, Technical Director of JSSA Composites Co., Ltd. compared several carbon fiber wind power application methods in detail, including heavy prepreg, carbon fiber fabric, reinforced carbon plate, etc., and listed several domestic and international carbon fiber wind power application examples. He believes that considering the full life cycle of wind turbines, the application prospects of carbon fiber will be more extensive. However, we still need to correctly look at the problems in the application of carbon fiber materials. In the future, research will focus on large tow carbon fibers, process innovation, thermoplastic carbon fiber composite blades, and carbon fiber composite recycling.
The main application fields of carbon fiber wound gas cylinders are: high-pressure gas cylinders for aerospace, gas cylinders for respirators, gas cylinders for vehicles, gas cylinders for transportation, etc., and there have been commercial applications, such as hydrogen storage cylinders for the 2008 Olympic Games , 2010 Shanghai World Expo hydrogen storage tanks for vehicles and 2016 SAIC Roewe 950 70MPa domestic only passenger car applications
Jiang, Chairman of SYSL New Technology Co., Ltd. will mainly introduce the key technologies and application advantages of 70MPa vehicle type III hydrogen storage bottles and 70MPa vehicle type IV hydrogen storage bottles, and analyze the domestic and foreign status of composite material cylinder health monitoring technology. . In terms of working condition safety evaluation and monitoring, micro-nano sensors are used to monitor the state of the composite pressure vessel in self-tightening, water pressure, impact, burst test and working process, and the stress and strain state of COPV lining and carbon fiber composite material layer is expected; In terms of full-life health monitoring, micro-nano sensors are used to monitor the stress and strain state of the composite pressure vessel during the full life cycle, and it is expected to determine the health status of the composite pressure vessel.
China's manufacturing industry has a huge potential market and is expected to lead the development of lightweight composite materials industry. Yu Muhuo, deputy director of the State Key Laboratory of Fiber Material Modification of Donghua University, believes that the application of lightweight composite materials in the manufacturing industry and the development of key technologies have the following trends: First, the global carbon fiber and aramid continue to expand production capacity and continue to cost The second is the continuous advancement of carbon fiber and aramid manufacturing technology and the continuous reduction of costs; the third is the continuous improvement of the performance of carbon fiber and aramid; the fourth is the rapid development of automated mass production technology of composite materials; the fifth is that various industries have begun to use composite materials in China. , Wind power, large passenger aircraft, high-speed rail cars (hydrogen cylinders, battery boxes, drive shafts, wheel hubs, leaf springs), construction, marine, chemical and other industries have been at the forefront of application; Sixth, for the target parts, research and development of the entire industry chain at low cost The technology system will give the leading companies in the market segment a great opportunity.
The key technology for large-scale application of composite materials in manufacturing is cost reduction. Focusing on the realization of low cost, he introduced the research and development direction and research results of his R & D team in detail, including the research on the integrated structure of the CFRP body chassis battery box, the industrial production and application of thermoplastic composite prepreg, and the CFRP battery box. Structural design (low cost + automated mass production + lightweight), research and development of prepregs for battery boxes (room temperature storage + rapid curing + flame retardant), and research and development of CFRP high-speed rail bogies.