Guangzhou saiao carbon fiber technology Lin gang general manager: should add attributive, aerospace use carbon fiber row generation.

Professor xu lianghua of Beijing university of chemical technology: personally, this classification is not suitable. It should be more reasonable from the Angle of composite materials. Fiber comparison is a raw material.

Guangzhou ", general manager of the carbon fiber technology Lin Gang: at the meeting, I was listening to you talk about the generational problem, return true not think this matter before, really like also does not have the idea that in the world. From the plane's bearing structure, a previous article on the structural design of T300 to T800. From the perspective of broad application, this generation can lead to misleading public opinion: after a period of time, the leaders of the state will inspect carbon fiber enterprises and may ask, how many generations have you been in your family? This is depressing.

Standing in the industry point of view, we can no longer "Chris catch the beauty" in the performance, only 10% of the industry units or enterprises of 10% of the energy for the whole of these advanced, profit is the first priority, especially under market competition (including international competition in the market) to make a profit. Profitability is the only criterion for testing technology. I think this is a pragmatic goal for China's current carbon fiber.

Jilin fine work carbon fiber company 庒 hering, general manager: agree s point of view, but the cost control is also a very difficult technical problems, need comprehensive technical strength.

Professor liu jie from Beijing university of chemical technology: there was a story about two years ago. I was left with a message that was neither scientific nor rigorous. It was just an act of grandstanding. The subgeneration should have obvious technical or principle features or distinct application performance characteristics, while also having recognized third-party test data or products. Don't take business or political work seriously and do more.

The high-tech fiber and the application in the standing deputy editor: I thought that the key in the second generation of classification, besides Gao Jiangzhong mode, lack of strong this type number in the anti-embrittlement, such as M55JB, M60JB, in fact the last grid rigid structure of satellite solar cell expansion boards, are made of carbon fiber molding in the anti-embrittlement!

, general manager of guangzhou "carbon fiber technology Lin Gang: liu, China's public opinion on carbon fiber, I think, our group should be have a say, at the same time, we also have a" correction "or" right "obligation, more maintenance industry credit consciousness and sense of mission. When we do not speak, others speak. In the end, we lose ourselves.

Professor liu jie from Beijing university of chemical technology. In terms of the principle and technology of carbon fiber itself, there is no fundamental breakthrough at present, only the specifications and models are different. Think of it as "proterozoic".

Constant god co., LTD in jiangsu Shen Zhen senior advisor: the development of carbon fiber was originally driven air applications, the development of toray carbon fiber is according to the requirements of Boeing, main is to improve the modulus of the development of the demand, so T300 and T800, T1100 as modulus as the representative of the three generations of fiber, such a classification is according to the demand points in the air, not on behalf of the carbon fiber must be so.

Beijing chemical industry university professor liu jie: I understand that the so-called "generational" is the principle, technical or performance has a significant leap or some breakthrough, rather than to change a little or T series modulus can cover, while most peer recognition.

Constant god co., LTD in jiangsu Shen Zhen senior advisor: the so-called three generations is aviation people distinguish, because the past development of carbon fiber is mainly air driven, with the application of carbon fiber, can, of course, have different points.

Zhang yongming vice President of China anxin technology co., LTD. : may still be divided according to modulus: 23/294/324gpa. At present, the strength of mechanical properties is more than the strength, but higher modulus is needed to solve the stiffness problem. It is not easy to get 324GPA on the carbonized line and keep 6.6 GPA.

President of China composites group corporation Zhang Dingjin: I agree with professor liu jie, we say that the 123 generation of carbon fiber are essentially PAN based, on the polymer and the carbonization process, technology and equipment are not essentially change. It must be divided into three generations, which can be divided into 123 generations.

Guangzhou saiao carbon fiber technology Lin gang general manager: usually, we talk about the generation of the industry, which is a pretty big thing, such as display technology, such as computer technology, is the technology generation that represents the whole industry. Only the strength and modulus of the steps, the theory of generation, will imply: advanced and backward. Zhang's general view is that I agree that it is ok to divide generation by air preleaching or composite materials. Moreover, it is not easy for airlines to change such "generation". It will take at least 20 to 30 years.

Professor liu jie from Beijing university of chemical technology: the design of aviation applications is understandable. But it is not scientific to generalize that "third generation of carbon fiber" is easily objectionable.

"High-tech fiber and application" is the deputy managing editor of shentu: in principle, it is reasonable to divide the generation of carbon fiber from a single generic type performance to a comprehensive high performance direction.

Original link:

Three generations of carbon fiber classification

First-generation carbon fibre

Features: low strength, low modulus carbon fiber

Products: T300 and Hertz company's AS4

Usage: T300 is mainly used for the secondary bearing component of the Boeing 737, and the AS4 is applied to the flat tail of the early f-14 fighter.

Second generation carbon fiber

Features: high strength, medium modulus carbon fiber

Products: dongli company's T800 and Hertz company IM7 series are representatives, and the products include T700, T1000, and IM8, IM9, etc

Application: aerospace and other fields are widely used

Third generation carbon fiber

Features: high strength, high modulus carbon fiber

Products: dongli announces the development of successful T1100G carbon fiber, Georgia institute of technology research and development products

Purpose: the third generation of carbon fiber products of dongli is more powerful, which is more suitable for the structure of high tensile strength design. American products have higher modulus of elasticity, more suitable for bending, impact and fatigue strength design.

Body text

Compared with the traditional metal materials and other fiber composite materials, carbon fiber composite materials with light weight, high strength, high modulus of elasticity, the characteristics of 30% than the traditional aluminum alloy structure weight loss, a huge contribution to weapon equipment performance improvement and is widely used in the manufacture of aircraft airframe and engine, such as missile casings. The United States - 22 F, F fighter in the carbon fiber composite materials dosage ratio reached 24% and 24% respectively, represented by the A350, a Boeing 787 new large commercial carbon fiber composite materials dosage ratio is more than 50%. The application of carbon fiber composite materials has become a symbol of the advanced nature of weapon equipment. Carbon fiber is the key raw material for composite materials, and the load is about 90% of the composite material. The tensile strength and elastic modulus are the key to realize the structural performance of composite materials.

First-generation carbon fibre

Carbon fiber is the main target of tensile strength and elastic modulus, and the commercial products have been developed to the second generation. The two countries have the same performance on the second generation of carbon fiber products widely used. The first generation of toray company in the 1960 s T300 and Hershey's AS4 low low modulus carbon fiber, T300 is mainly used for the Boeing 737 and other types of bearing components, AS4 application F - 14 fighters in the early stages of a flat tail etc.

Second generation carbon fiber

The second generation of high-strength, medium modulus carbon fiber is represented by the T800 and HMS IM7 series in the 1980s, and the products include T700, T1000, IM8, IM9 and so on.

The T800 intensity increased by 68% compared with T300 intensity, and the modulus increased by 28%, which was used in the main bearing structure of the fuselage of A350 and Boeing 787. IM7 was 37% higher than that of AS4 strength, modulus increased by 21%, a large number of used in the United States "the trident" Ⅱ submarine-launched missiles and F - 22, F - 35 fighter, etc.

At present, aerospace and other fields of the most widely used is the second generation of high strength of medium modulus carbon fiber, because of the low modulus, and the carbon fiber material brittleness is big, easy to cause the fatigue damage of composite material structure parts, even catastrophic damage, limits the promotion of aviation weapon equipment performance, more difficult to meet a new generation of aviation weapon equipment performance requirements. As the United States started the sixth generation fighter jet, a new generation of long-range bombers, the first generation of unmanned shipboard combat aircraft, aviation weapon equipment for cruising speed, range, mobility, stealth performance, protection and maintainability index are put forward higher request, this needs such as tensile strength, fracture toughness, impact performance higher comprehensive properties of carbon fiber. To obtain high comprehensive properties of carbon fiber, it has to the strength and modulus of a breakthrough on the two basic properties, and the main technical characteristics of the third generation of carbon fiber is at the same time achieving high tensile strength and high modulus of elasticity.

At the same time, high tensile strength and elastic modulus are the technical difficulties in the development of carbon fiber. Raw silk preparation and carbonization are two core processes of carbon fiber preparation: high quality PAN raw silk is the key to realize high performance and mass production of carbon fiber. The control of carbonization process is directly related to the tensile strength and elastic modulus of carbon fiber. After years of carbon fiber development, the tensile strength can be significantly reduced when the elastic modulus of carbon fiber is greatly increased. While maintaining the high tensile strength of carbon fiber, it is difficult to increase the elastic modulus of fiber greatly. For its reasons, carbon fiber is made up of anisotropic materials composed of a large number of graphite microcrystals. High strength carbon fiber usually requires a small size, while high modulus carbon fiber usually requires a large size. How to solve this contradiction is the biggest problem in the development of carbon fiber.

Third generation carbon fiber

From two different technical approaches, Japan and the United States have obtained high strength and high modulus carbon fiber.

From the current research results, dongli's third generation of carbon fiber products is more powerful, which is more suitable for the structural components of high tensile strength design. American products have higher modulus of elasticity, more suitable for bending, impact and fatigue strength design. Japan-us relevant enterprises and institutions have made it clear that the third generation of the application of carbon fiber goal is aerospace high-end market, the second generation of alternative current T800 and IM7 carbon fiber products, increase the intensity of military aircraft structure parts, stiffness etc. Comprehensive performance. Toray pioneered the traditional technique of PAN spinning solution, the original wire technology highly mature, the industrialization of ability, from the point of first and second generation product, the third generation of products is expected to realize industrialized production in the next 5 ~ 10 years and put on the market in an all-round way. In the United States, the preparation process of traditional solution raw silk is abandoned, and the technology of gel spinning is adopted. There is more room for process optimization and the performance of carbon fiber has more room for improvement. The United States is scheduled to appear before and after 2030, the sixth generation of fighter aircraft, a new generation of long-range bombers, the first generation of unmanned carrier-borne aircraft most likely through the application of the third generation of carbon fiber technology and greatly improve operational performance.

By breaking through the carbonization process, Japan's dongli company has promoted the strength and modulus of carbon fiber by more than 10 percent, leading to the technical requirements of the third generation of carbon fiber. The key to the high tensile strength and high elastic modulus of carbon fiber is the heat treatment technology and high temperature equipment in the carbonization process. In heat treatment technology, temperature, drafting, catalysis, magnetic field and other factors can affect the performance of the carbonized fiber. In March 2014, dongli announced the development of the successful T1100G carbon fiber. Toray using conventional PAN spinning solution technology, fine control carbonization process, improve the microstructure of carbon fiber on nanometer scale, the carbonization fiber after graphite crystallite orientation, crystallite size, defects, etc, so that strength and elastic modulus are improved. The tensile strength of T1100G is 6.6 GPa and 12% higher than T800. Elastic modulus 324GPa, up 10%, is entering the industrialization phase.

The research team of the Georgia institute of technology in the United States, through the breakthrough of the raw silk preparation process, in keeping the carbon fiber high strength, the elastic modulus increased by more than 28 percent. The carbon fiber products of hushi company have been stuck in the medium elastic modulus for 30 years, and the performance is difficult to break through. The defense advanced research agency (DARPA) launched the advanced structural fibre project in 2006 to bring together national strengths to develop the next generation of structural fibers, mainly carbon fiber. Georgia institute of technology, as one of the research institutions, started with the preparation of raw silk and raised the elastic modulus of carbon fiber. In July 2015, the team used the innovative PAN - based carbon fiber gel spinning technique to increase the tensile strength of carbon fiber to 5.5 ~ 5.8 GPa and stretch elastic modulus of 354 ~ 375GPa. Although the tensile strength and IM7 are comparable, the elastic modulus has achieved a significant increase of 28% ~ 36%. This is the current report of carbon fiber high strength and maximum modulus combination. Its mechanism is the gel polymer chain link together, produce strong chain of internal force and stereospecificity of crystallite orientation, guarantee the high elastic modulus of the required larger crystallite size case, still have a high strength. This shows that the us already has the independent r&d capability of the third generation of carbon fiber products.