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Development And Research Status Of Domestic PAN-based Carbon Fibers
In order to meet the needs, in the late 1960s, my country and foreign countries began to develop polyacrylonitrile-based carbon fibers at the same time. In the face of export restrictions and strict technology blockades from Western countries, the older generation of scientific research workers has exerted the spirit of self-reliance. After hard work, they have developed carbon fiber products close to T-300. A carbon fiber with a strength close to 5.OGPa is obtained. The high-modulus Shiken fiber produced with foreign carbon fiber as raw material has just been successfully developed, and the high-strength medium-modulus carbon fiber is being developed.
The total capacity of domestic carbon fiber production is 850 tons/year. Compared with the advanced level of Okaji, domestic carbon fiber still has many shortcomings. The outstanding problems are the low strength of carbon fiber , poor uniformity and stability , There are many wools , single variety and high price , and the development level is nearly 20-30 years behind that of foreign developed countries.
This carbon fiber cannot be used for high-tech defense weapons that require high mechanical properties, and can only be used in ablation-resistant functional composite materials. The general-purpose carbon fiber whose performance index is suitable for the requirements of civil products is rarely used by domestic users because of the excessive unevenness and high price. This status quo greatly limits the upgrading of my country’s high-tech strategic weapon systems and the development of the national economy, which is extremely incommensurate with my country’s status as a major power.
Our country’s scientific and technical personnel have accumulated a lot of perceptual knowledge on the technical issues affecting the principle and the quality and performance of carbon filaments; they have also done some work on the scientific issues of improving and improving the quality of the raw silk. However, those perceptual knowledge are hardly summarized and refined into key technical issues and key scientific issues for discussion and research in time. Even if some theoretical work has been done, it has been carried out in isolation, separation and one-sidedness, and most of it has been shelved in forgotten corners. Therefore, the research on the basic theory of carbon fiber is always weak, and the work on the raw silk is even more pitiful. In the past few years, very few theoretical articles have been published.
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What Is Carbon Fiber?Carbon fiber is made of polyacrylonitrile (PAN) (or pitch, viscose) and other organic fibers by carbonization (removal of most elements except carbon) by pyrolysis method under inert gas at high temperature above 1,000 °C. Inorganic polymer fibers with a carbon content of more than 90%.