In the practical application of titanium alloy, in addition to greatly reducing the weight of the structure, titanium alloy also has high fatigue resistance and corrosion resistance. Some titanium alloy materials can also replace the aluminum alloy material with poor heat resistance in the parts of the aircraft body at higher temperature, and achieve about 30% weight reduction effect. In the early 1950s, the military aircraft began to use a small amount of titanium material to make heat insulation board, tail cover, reduction plate and other structural parts with small stress. In the 1960s, titanium alloy material began to be used in the main structural parts such as load-bearing frame, mid-wing box beam, landing gear beam and so on. With the continuous improvement of aircraft performance, the titanium alloy in the current third generation, fourth generation fighter titanium using ratio gradually increased, the F / 22 fighter planes in titanium consumption accounted for 38.8% of the structure weight of 54 large titanium alloy casting weight accounts for about 7.1% of the weight of the whole machine structure, reduce the structure weight 600 kg, and the whole machine composite effect of weight loss.
Compared with the third-generation and third-generation semi-domestic fighters, the titanium consumption of J-20, J-31 and other new-generation fighters in China is further increased. The titanium consumption of the whole aircraft is about 20%~30%, which is basically the same as the titanium consumption of F-35. Compared with the United States, Russia and other powers, domestic a disparity between the number and quality of military aircraft, helicopters, trainers, conveyor, special aircraft model number gap is larger, the current J - 15, the J - 16, 20, 20, Y, Z - J - - 20 new aircraft will gradually enter the stage of scale production, new aircraft during 14 or 15 Fielding, change is expected to bring about 26000 tons of titanium demand.
The aviation titanium material of commercial aircraft accounts for more than 40% of the global titanium consumption, and the domestic titanium material market of civil aircraft is expected to open gradually. Boeing's B777 uses about 8 percent titanium, a total of 5.9 tons per aircraft, and the B787 uses 15 percent. Due to the good compatibility between titanium alloy and composite material, titanium alloy has replaced the traditional aluminum alloy material in some parts. Airbus has increased the composite material content from 5.5% to 25% from A320 to A380 aircraft, and the corresponding titanium material content from 4.5% to 10%. At present, the titanium alloy dosage of ARJ21 is 4.8%, and the titanium dosage of C919 has reached 9.3%, including 5 series and 6 grades of titanium alloy such as low strength and high plasticity, medium strength and medium toughness, medium strength and high toughness, and high strength and high toughness. With the increase of domestic large aircraft production such as ARJ-21 and C919, the commercial aviation titanium material market with broad space will gradually open.
