At 7:30 on the 17th, Shenzhou No. 11 manned spacecraft at the Jiuquan Satellite Launch Center by the "Shen Jian" Long March II F-11 carrier rocket carrying two male astronauts launched. The Shenzhou 11 manned spacecraft carrying astronauts Jing Haipeng, Chen Dong, and last month September 15 Mid-Autumn Night launch of the successful "Temple II" space laboratory rendezvous and docking to form a combination of flight 30 days, which will be China's longest time to date a manned flight, the total flight time of 33 days. Shenzhou 11 launch will be China's space industry to a new height, the aerospace industry usher in new development opportunities.
China's manufacturing spacecraft is the main material of aluminum. It is understood that the "Long March" series of carrier rockets and the "Shenzhou" spacecraft propulsion module of the fuel tank, manned cabin (escape capsule), orbital module and the Temple of Space Laboratory II resource module and laboratory need a large number of aluminum alloy material. So, aerospace aluminum alloy which are the main? At present, the application of aluminum alloy in aerospace is divided into: large-scale extrusion of aluminum alloy, aluminum-lithium alloy, aluminum alloy plate, aluminum alloy castings.
Aluminum Extrusion Extrusion
With the progress of science and technology, aluminum alloy profiles are large-scale, the whole, thin-walled flat wide, high-precision size, complex shape of the direction of the application of civil-type materials have been extended to aerospace profiles, The main features are: large and integrated; thin-walled and lightweight; cross-section size and shape and location tolerance precision; uniformity of the organization and performance and quality. As a result of large-scale profiles with the above characteristics, to the extrusion process has brought a series of difficulties. Aerospace with a large extrusion profiles are: the overall belt with wall panels, the word beam, wing beams, comb-shaped profiles, such as hollow beam profiles. Mainly used for aircraft, spacecraft and other spacecraft aircraft structural components and the helicopter shaped hollow rotor girders and aircraft runway and so on.
Al-Li alloy is the most rapid development of aviation metal materials in recent ten years. Lithium is the lightest metal in the world. The metal lithium as an alloying element added to the metal aluminum, the formation of aluminum-lithium alloy. After adding lithium metal, the specific gravity of the alloy can be reduced and the rigidity can be increased while still maintaining high strength, good corrosion resistance and fatigue resistance, and suitable ductility.
Because of these characteristics, this new type of alloy has received extensive attention in the aerospace industry. According to calculations, if the choice of leading aluminum-lithium alloy to replace the traditional aluminum alloy manufacturing Boeing aircraft, the weight can be reduced by 14.6%, fuel savings of 5.4%, aircraft costs will decline 2.1% per aircraft per year flight costs will drop 2.2%. Therefore, the aluminum-lithium alloy is considered to be the most ideal structural material for aerospace. 80 years of the 20th century, the scale of the world set off a study of aluminum-lithium alloy climax. However, due to the special application background of Al-Li alloy, the key technology in the research of Al-Li alloy is highly confidential in all countries.
Aluminum alloy plate
Aluminum alloy plate is an important structural material of modern aerospace industry. Aluminum industry in developed countries has continuously developed a new type of aluminum alloy thick plate, which is widely used in aircraft frame, the whole wall, landing gear, skin and so on. They have high strength, good resistance, anti-stress function and anti-peeling corrosion function, LY12, 2A12 aluminum plate and good fracture resistance, anti-fatigue crack development ability, aluminum alloy plate as aerospace materials with excellent overall performance .
Aluminum alloy castings
In modern aircraft structural parts, the use of 1500 ~ 2000 kinds of aluminum castings, according to the aircraft using the different conditions and parts, mainly with three basic aluminum alloy: high-strength aluminum alloy, heat-resistant aluminum alloy, corrosion-resistant aluminum alloy. High-strength aluminum alloy is mainly used for aircraft fuselage parts, engine compartment, seats, control systems, in most cases can replace aluminum die forgings; heat-resistant aluminum alloy parts are mainly used for close to the motor cabin, air exchange systems, Where the temperature reaches 200 ~ 400 ℃, compared with the general structure of alloys and high strength alloys, the alloy has the advantage of high degree of alloying; corrosion resistant aluminum alloy has a high enough performance index, its strength, plasticity, impact toughness, fatigue Performance and weldability are very good, mainly with corrosion resistance, so that can be used for seaplane, it belongs to the aluminum - magnesium alloy and aluminum - magnesium - zinc alloy.