New aviation materials should be based on domestic anti-foreign "card neck"

The Guiyang International Forum of Ecological Civilization will be held in 2014, and the “Creative Economy and Green Aviation” sub-forum will invite relevant departments of AVIC, Chinese and foreign general aviation companies, local governments, and industry experts to participate in the dialogue on “Creative Economy and Aviation”. The topic is in-depth communication. On the eve of the opening of the “Creative Economy and Green Aviation” sub-forum, the reporter interviewed Cao Chunxiao, a researcher at the Beijing Aviation Materials Research Institute of AVIC and a member of the Chinese Academy of Sciences, on topics such as China Aviation New Materials.

When talking about green aviation, Cao Chunxiao takes Boeing 787 as an example. This model has a 20% lower fuel consumption than similar aircraft, and has obvious advantages in energy saving and emission reduction. The reason why Boeing 787 can achieve this is because it uses a new type of aviation material with higher specific strength, composite material accounts for 50%, titanium alloy accounts for 15%, can effectively reduce the structural weight of the body, in the same mileage, passengers In the case of several, it is more conducive to energy saving and emission reduction. According to the existing data, after the Boeing 787, the flight from Beijing to Seattle has 1 ton less fuel per hour than the similar aircraft, and the flight speed has also increased. The entire voyage is calculated, and the energy saving effect is remarkable.

Cao Chunxiao believes that whether the aircraft is advanced and "green" should be investigated in four factors. The first is naturally safety. It is also necessary to consider economics, comfort and environmental protection. For example, comfort, the Boeing 787 is on the cabin humidity index. Leading the way, 10 degrees higher than similar aircraft, this is not a small achievement. Conventional aircraft that basically use aluminum alloy materials, metal materials are easily corroded with increasing humidity, and a large number of composite materials and titanium alloys with high corrosion resistance can be used to increase humidity and improve ride comfort. The anti-fatigue properties of the new aviation materials are also superior to those of the traditional aluminum alloy materials. Therefore, the air pressure in the cabin can be appropriately increased. For example, the cabin air pressure of the Boeing 787 is 1800 meters above sea level, which is higher than the air pressure level of 2400 meters above sea level of similar aircraft. The ride comfort is also improved.

With the positive development of the ARJ21 domestic new regional aircraft and the C919 large aircraft project, the development level of composite materials in China has received much attention in recent years. The maturity of China's domestic composite materials has yet to be improved, and there is still a gap compared with the United States. It will take time for large-scale adoption on the aircraft. In this regard, Cao Chunxiao emphasized that on the issue of new aircraft materials, we should adhere to the principle of self-innovation and self-innovation; although aircraft materials and components can be purchased globally, key components and key materials should be based on domestic production. Suppliers should have domestic enterprises to prevent being subject to people and be "card necked" by other countries; in composite materials, although they can be purchased out of part, if the domestic can not be developed at all, the outsourcing price may be extremely high, for example, when China is After the breakthrough of T300 grade carbon fiber, the purchase price of foreign suppliers dropped sharply.

It is reported that China is also developing carbon fiber for T700 and T800 high-end composite materials, but the development does not mean that stable mass production can be achieved, and achieving stable mass production does not mean meeting airworthiness standards. Therefore, the relevant units in China are working together. China's high-end composite materials still need to work hard to catch up with the world's advanced level. China's green aviation road has a long way to go.

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