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Talking about the use of titanium alloy

2021-08-19 04:13:08
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Titanium alloy has the advantages of high strength, low density, good mechanical properties, good toughness and corrosion resistance. In addition, titanium alloys have poor process performance and are not easy to cut. It is easy to absorb impurities such as hydrogen, oxygen, nitrogen, and carbon during thermal processing. The wear resistance is poor and the production process is complicated. Industrial production of titanium began in 1948. The development of the aviation industry requires the titanium industry to develop at an average annual growth rate of about 8%. At present, the world's annual output of titanium alloy products has reached 4 million tons, with nearly 30 titanium alloys. The most widely used titanium alloys are Ti-6Al-4V (TC4), Ti-5Al-2.5Sn (TA7) and industrial pure titanium (TA1, ta2 and TA3).


Titanium alloys are mainly used in the manufacture of compressor parts for aircraft engines, followed by rockets, missiles and high-speed aircraft. Titanium and its alloys were widely used in general industry in the mid-1960s, for the manufacture of electrodes in the electrolysis industry, condensers in power plants, heaters for oil refining and desalination, and environmental pollution control devices. Titanium and its alloys have become a kind of anti-corrosion structural materials. In addition, it is also used to produce hydrogen storage materials and shape memory alloys.


In 1956, China began to study titanium and titanium alloys; in the mid-1960s, the industrial production of titanium materials began, and TB2 alloys were developed.


Titanium alloy product use

Titanium alloy is an important new structural material in the aerospace industry. Its specific gravity, strength, and operating temperature are between aluminum and steel, but it has high specific strength, good seawater corrosion resistance, and ultra-low temperature performance. In 1950, the United States used the F-84 fighter bomber for the first time as non-load-bearing components such as the rear fuselage heat shield, windshield, and tail. Since the 1960s, titanium alloys have been used in the middle part of the rear of the fuselage, partially replacing structural steel, and used to manufacture important load-bearing components such as diaphragms, beams, flaps and slides. The amount of titanium alloy used in military aircraft has increased rapidly, reaching 20% to 25% of the weight of the aircraft structure. Since the 1970s, titanium alloys have been widely used in civil aircraft, such as the Boeing 747, which uses more than 3,640 kilograms of titanium. The titanium used in aircraft with Maher number less than 2.5 is mainly used to replace steel to reduce structural weight. For example, the United States SR-71 high-altitude high-speed reconnaissance aircraft (flying Mach number 3, flying height of 26212 meters), titanium accounts for 93% of the weight of the aircraft structure, is called "all-titanium" aircraft. When the thrust-to-weight ratio of aero engines increases from 4-6 to 8-10 and the compressor outlet temperature increases from 200-300 degrees Celsius to 500-600 degrees Celsius, the original low-pressure compressor disks and aluminum blades must be replaced by titanium Alloys or titanium alloys for high-pressure compressor disks and blades replace stainless steel to reduce structural weight.


In the 1970s, titanium alloys used in aircraft engines generally accounted for 20%-30% of the total weight of the structure. They are mainly used to manufacture compressor components, such as forged titanium fans, compressor disks and blades, cast titanium compressor casings, intermediate sleeve bearing housings, spacecraft, etc. Titanium alloys are mainly used for high specific strength, corrosion resistance and low temperature resistance to manufacture various pressure vessels, fuel tanks, fasteners, instrument straps, frames and rocket shells. Artificial earth satellites, lunar modules, manned spacecraft and space shuttles also use titanium alloy plates for welding.



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