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Why choose titanium bolts

2016/7/9 14:24:15      Click£º

Titanium alloy with high strength and density of small, good mechanical properties, toughness and corrosion resistance is very good.In addition, the process performance of titanium alloy is poor, machining difficulty, in the hot working, very easy to absorb hydrogen nitrogen impurities such as carbon.And abrasion resistance is poor, complex production process.Titanium industrial production was started in 1948.The needs of the development of aviation industry, make titanium industry development with an average of about 8% a year growth.The world titanium alloy processing material annual output reached 40000 tons, of nearly 30 kinds of titanium alloy.Is the most widely used titanium alloy Ti 6 al 4 v , Ti-5Al-2.5Sn and pure titanium (GR1,GR2,GR3).
Titanium alloy is mainly used to produce aircraft engine compressor components, followed by titanium alloy of rockets and missiles and high-speed plane structure.60 s, titanium and its alloy has set up a file in the general industrial application, used for making electrode electrolysis industry, power plant condenser, oil refining and seawater desalination heater and environmental pollution control devices, etc.Titanium and its alloy has become a corrosion resistant structure materials.In addition, for the production of hydrogen storage material and shape memory alloy, etc.
Titanium alloy is used in the aerospace industry is a new important structural materials, proportion, the intensity and the use of temperature between aluminum and steel, but better than high strength and excellent corrosion resistance to seawater and ultra-low temperature performance.Titanium alloy for the first time in 1950 the United States on the F - 84 fighter-bombers, used as a body heat insulation board, after ventilation hood, such as the tail cover the bearing components.In the 60 s the use of titanium alloy parts from the aft fuselage to move to the fuselage, partly instead of steel manufacturing, the frame beam, the flaps slide rail, and other important bearing components.Rapid increase in the amount of titanium alloy in military aircraft, reached 20% ~ 25% of the weight of aircraft structure.The 70 s, general began extensive use of titanium alloy, titanium alloy, such as the Boeing 747 with titanium quantity of 3640 kg.Mach number is less than 2.5 aircraft mainly to replace titanium steel, in order to reduce the structure weight.As another example, the SR - 71 high speed scout (flight Mach number is 3, altitude 26212 meters), titanium accounted for 93% of the plane structure weight, so-called "titanium" aircraft.When aeroengine in esteem than increased from 4 to 6 to 8 ~ 10, compressor outlet temperature accordingly increased to 500 from 200 ~ 300 ¡ã C to 600 ¡ã C, low-pressure compressor plate made of aluminum and titanium alloy blades must use titanium alloy material, or use titanium alloy instead of stainless steel high pressure compressor disk and blade, in order to reduce the structure weight.In the 70 s, the dosage of titanium alloy in the aircraft engine generally accounts for 20% ~ 30% of total weight structure, mainly used in the manufacture of compressor parts, such as forging of titanium fan, compressor disk and blade, titanium compressor casing, intermediate casing, bearing housing, etc.Spacecraft, which make use of the specific strength of titanium alloy, corrosion resistance and low temperature resistance to manufacture all kinds of pressure vessel, fuel tank, fasteners, instrument strap, architecture and rocket shell.Artificial earth satellite, the lunar module, manned spacecraft and space shuttle USES titanium alloy plate weldments.