Carbon fiber is made of organic parent fiber (viscose fiber, polyacrylonitrile or asphalt, etc.) carbonized by high temperature decomposition method under the inert gas of 1000 ~ 3000 ℃, which has the characteristics of high strength, high modulus, low density, small linear expansion coefficient, etc., and is a material with excellent mechanical properties. Its main purpose is to composite with resin, metal, ceramics, cement and other matrix to make structural materials.
At present, there are viscose based, asphalt based and polyacrylonitrile (Pan) based carbon fibers. Viscose based and asphalt based carbon fibers have a single use and limited output. PAN based carbon fibers have developed rapidly because of their simple production process, excellent mechanical and high-temperature properties, as well as good structural and functional characteristics. They have become the main development and application of high-performance carbon fibers The dominant variety is the mainstream of carbon fiber, and its output accounts for about 90%. The carbon fiber has excellent properties, 20 times of strength, 2-3 times of tensile modulus, 1 / 4 of specific gravity and 7.9 times of tensile strength. The young's modulus of carbon fiber is about 3 times of traditional glass fiber and 2 times of Kevlar fiber (kf-49). At the same time, the carbon fiber is insoluble in organic solvent, acid and alkali, with outstanding corrosion resistance.
Carbon fiber composite used in aviation
Carbon fiber reinforced resin matrix composite is an important material for the production of weapon equipment. In fighter and helicopter, carbon fiber composite is applied to main structure, sub structure and special functional parts of fighter. The application of carbon fiber / epoxy and carbon fiber / double horse composite materials in the fuselage, main wing, vertical tail wing, flat tail wing, skin and other parts of the fighter has played an obvious role in reducing weight, greatly improving the fatigue resistance, corrosion resistance and other properties. The data shows that the front fuselage section with composite structure can reduce the mass by 31.5%, parts by 61.5% and fasteners by 61.3% compared with the metal structure; The weight of composite vertical stabilizer can be reduced by 32.24%. After the weight of space equipment such as the aircraft is reduced, the fuel consumption during the operation of the aircraft can be reduced. Moreover, carbon fiber has very stable chemical properties, which can protect the external mechanism of aircraft.
In addition to the above advantages, carbon fiber materials also have very excellent bearing capacity, which is several times more than that of steel materials. This is beyond the reach of other materials. It is well known that when the aircraft takes off, it needs a large initial speed to meet the needs of the aircraft to overcome gravity and take off smoothly. Only when the initial speed reaches a certain speed can it take off smoothly. Because of the convection between the ultra-high speed and the air during the flight, the aircraft will also bear a lot of heat brought by the friction between the air and the body, so the elastic requirements of the aircraft outer material to withstand high temperature are very high.
Carbon fiber composite used in aerospace field
Advanced composite materials, which are typical of high performance carbon (graphite) fiber composites, as structural, functional or structural / functional integrated component materials, also play an irreplaceable role in missiles, launch vehicles and satellite vehicles. The level and scale of its application are related to the success or failure of the leapfrog promotion and model development of weapons and equipment.
Carbon fiber composite materials are mainly used in structural parts of missile warhead, missile body, engine shell and structural bearing parts of satellite main body. Carbon / carbon and carbon / phenolic are important heat-resistant materials such as warhead end, nozzle throat lining of engine and ablation resistant parts. They have been widely used in strategic missiles such as midget, civilian and Trident in the United States. Solid engine in the United States, Japan and France The shell is mainly made of carbon fiber composite materials, such as American trident-2 missile, Tomahawk cruise missile, hercules-4 rocket, French ariane-2 rocket modification, Japanese m-5 rocket and other engine shells. Among them, im-7 carbon fiber with tensile strength of 5.3gpa produced by Hercules company of the United States is the most widely used, Toray T-800 fiber with tensile strength of 5.6 5gpa, Young's modulus 300gpa.
Carbon fiber composite demand
Statistics of global carbon fiber demand by Sector in 2018
Data source: prospective industry research institute
Aerospace industry is the traditional market of carbon fiber in the world. The production and research of carbon fiber composite is directly related to whether China's high-tech industry, especially aerospace industry, can occupy the forefront of science and technology in the world. Since 2011, the global demand for carbon fiber in the field of aerospace is growing; it is estimated that by 2023, the global demand for carbon fiber in the field of aerospace is expected to exceed 30000 tons, and the application prospect of carbon fiber in aerospace is promising. But now the market is in urgent need of high-performance and high-quality carbon fiber composite materials, so the state's strong support plays a very important role, not only to help in funding, but also to create a good environment to promote development. Give support in policy, give help in capital, cultivate a group of technology-based enterprises with super competitiveness, and produce products with core competitiveness. Only in this way can China's carbon fiber composite materials occupy an important position in the world, and be in an advantageous position in the international competition in the future.
Reference source:
Gu Chaoying. Development and application of carbon fiber composite in aerospace field
Liu Yongqiang. Practical application of carbon fiber composite in aerospace
Lin Dechun. Application of carbon fiber composite in aerospace
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Preparation and characterization of 2020 national pharmaceutical powder
Technology Summit Forum
Under the premise of successfully holding the "2019 national pharmaceutical powder preparation and Characterization Technology Summit Forum", as required by the industry, China powder network will hold the "2020 second national pharmaceutical powder preparation and Characterization Technology Summit Forum" in Hangzhou in 2020. The forum will focus on the most cutting-edge theory and practice of Powder Engineering, learn and exchange the application of powder engineering in pharmaceutical powder Experience and experience, strengthen the understanding of pharmaceutical practitioners on Powder Science, help pharmaceutical enterprises explore the way forward, and provide a shared platform for pharmaceutical practitioners.
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