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Titanium alloy purposes
Time: 2013-07-25 21:39
Titanium alloys has a high strength and density and small, good mechanical properties, toughness and good corrosion resistance. In addition, the titanium process performance cutting processing difficulties in the thermal processing, is easy to absorb carbon hydrogen nitrogen and other impurities. There abrasion resistance is poor, complex production process. Titanium industrial production began in 1948. Development needs of the aviation industry, the titanium industry with an average annual growth rate of about 8% develop. World titanium alloy production reached 40,000 tons, nearly 30 kinds of titanium alloys. The most widely used titanium alloy is Ti-6Al-4V (GR5), Ti-5Al-2.5Sn (Gr6) and commercially pure titanium (GR1, GR2 and GR3).
Titanium is mainly used for the production of aircraft engine compressor components, followed by rockets, missiles and high-speed aircraft structural parts. Mid-1960s, titanium and its alloys have been applied in general industry, for the production of an electrode electrolysis industry, power station condensers, oil refining and desalination heater and environmental pollution control devices. Titanium and its alloys have become a corrosion resistant structural material. Also for the production of hydrogen storage materials and shape memory alloys.
China in 1956 began studies of titanium and titanium alloys; began in the mid 1960s and the development of industrial production of titanium into TB2 alloys.
Titanium is used in the aerospace industry an important new structural materials, specific gravity, strength and temperature range between aluminum and steel, but high strength and excellent corrosion resistance to seawater and ultra-low temperature performance. 1950 United States for the first time in the F-84 fighter-bombers used on the rear fuselage insulation panels, wind shield, tail cover and other non-load-bearing components. 1960s the use of titanium parts from the rear fuselage toward the body, partially replaced structural steel bulkheads, beams, flap tracks and other important bearing components. Alloy in military aircraft rapid increase in the amount, the weight of the aircraft structure to achieve 20% to 25%. Since the 1970s, began extensive use of titanium civilian aircraft, such as the Boeing 747 with a capacity of 3,640 kg or more of titanium. Mach number of the aircraft is greater than 2.5 titanium primarily to replace steel in order to reduce the structural weight. In another example, U.S. SR-71 high-altitude reconnaissance aircraft (flight Mach 3 at an altitude of 26,212 meters), titanium accounted for 93% of the weight of the aircraft structure, known as "all-titanium" aircraft. When the aircraft engine thrust-weight ratio increased from 4 to 6 to 8 to 10, the compressor outlet temperature correspondingly from 200 ~ 300 ° C to 500 ~ 600 ° C, the original low-pressure compressor disk made of aluminum and the blade must switch to titanium, or titanium instead of stainless steel high-pressure compressor disk and blades to reduce the structural weight. 1970s, titanium in the amount of general aviation engines accounted for 20% of the total weight of the structure to 30%, mainly for the manufacture of compressor components, such as forging titanium fan, compressor discs and blades, cast titanium compressor casing, intermediary casing, bearing housing and so on. Spacecraft using mainly titanium high specific strength, corrosion resistance and low temperature performance to manufacture all kinds of pressure vessels, fuel tanks, fasteners, instrument straps, architecture and rocket shells. Artificial earth satellites, lunar module, manned spacecraft and space shuttles are also using titanium plates welded.
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