Talking about the application of titanium in military aircraft
The application of titanium in aircraft began at the beginning of the last century. It was first used in military engines. In 1950, the United States took the lead in using pure titanium on the F84 fighter-bomber to manufacture non-stressed rear fuselage heat shields, wind guides, and tail covers. Structure. According to the calculations at that time, every 1kg reduction in the engine mass can reduce the cost of use by 220 to 440 US dollars. In the mid-1960s, the United States launched the all-titanium YF12A/SR-71 aircraft, and the amount of titanium used accounted for 95% of the structural mass of the aircraft. Since then, the application of titanium alloys in aero-engines has increased year by year, mainly used to manufacture fan blades, compressor blades, discs, shafts, and rims. Since the mid-1960s, titanium alloys have been widely used in aircraft structures.
In the United States, the proportion of titanium used in military aircraft produced from 1969 to 1989 was: F-14 accounted for 24%, F-15 accounted for 27%, F-18 accounted for 13%, F117 accounted for 25%, B-2 accounted for 26%. The titanium content of the French Mirage 2000 aircraft is 23%, and the Russian Cy (read "Su")-27CK is 18%.
The Chinese J-7 fighter is a single-seat, single-engine, supersonic (2M) fighter that first flew in 1966 and uses titanium for the thermal insulation of the engine compartment. The J-8 is a single-seat twin-engine supersonic high-altitude fighter. It first flew in 1984, and they are all second-generation fighters. The J-8 (2) fuselage uses 3.97% titanium, while the J-10 and J-11 fighters use more titanium. The titanium materials used on Chinese fighters include industrial pure titanium and titanium alloys such as Ti-2A1-1.5Mn, Ti-5Al-4V, Ti-6Al-4V, Ti-1023, and Ti-15-3. Titanium alloys used in the manufacture of blades, discs, and casings of jet engines such as WP-6, WP-7, WP-13, WS-6, and WS-9 are Ti-6Al-4V, Ti-5A1-2.5 Sn, Ti-2Al-1.5Mn, Ti-4.5Al-1.5Mn, Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si and Ti-6.5A1-3.5Mo-1.5Zr-0.3Si, and so on.
