What is the benefit of titanium alloy to make glasses frame?
Titanium alloy has high strength and low density, good mechanical properties, good toughness and corrosion resistance. In addition, titanium alloy has poor technological performance and difficult cutting. It is easy to absorb impurities such as hydrogen, oxygen, nitrogen and carbon in hot working. There are also poor wear resistance and complex production process. The industrialization of titanium began in 1948. The development of aviation industry makes titanium industry develop at an average growth rate of about 8% per year. At present, the annual output of titanium alloy processing materials in the world has reached more than 40000 tons, and nearly 30 titanium alloy grades. 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 alloy is mainly used to make compressor parts of aircraft engine, followed by rocket, missile and high-speed aircraft structure. In the mid-1960s, titanium and its alloys have been used in general industry, such as electrodes for electrolysis industry, condensers of power stations, heaters for oil refining and desalination, and environmental pollution control devices. Titanium and its alloys have become a kind of corrosion resistant structural materials. In addition, it is also used to produce hydrogen storage materials and shape memory alloys.

China began the research of titanium and titanium alloy in 1956; In the mid-1960s, the industrial production of titanium materials and the research of TB2 alloy were carried out.

Titanium alloy is a new important structural material used in aerospace industry. The specific gravity, strength and temperature are between aluminum and steel, but the specific strength is high and has excellent anti sea corrosion performance and ultra-low temperature performance. In 1950, the United States first used as a non bearing component such as the rear body heat shield, air guide cover and tail cover on the F-84 fighter bomber. Since 1960s, the use of titanium alloy moved from the rear body to the middle fuselage, partly replacing the structural steel to make the important bearing members such as the diaphragm, beam and flap slide rail. The amount of titanium alloy in military aircraft increased rapidly, reaching 20% - 25% of the aircraft structure weight. Since the 1970s, civil aircraft began to use titanium alloy in large quantities, such as Boeing 747 aircraft with titanium content of more than 3640 kg. Titanium is mainly used in aircraft with Mach number less than 2.5 to replace steel to reduce the structure weight. For example, SR-71 high-speed reconnaissance aircraft (flight Mach number is 3 and flight height is 2622m), titanium accounts for 93% of the aircraft structure weight, which is called "all titanium" aircraft. When the thrust weight ratio of aeroengine increases from 4 to 6 to 8-10, the compressor outlet temperature is correspondingly from 200 to 300 ° C increased to 500-600 ° When C is used, the original low pressure compressor disc and blade made of aluminum must be made of titanium alloy or titanium alloy instead of stainless steel to make high pressure compressor disc and blade to reduce the structure weight. In 1970s, titanium alloy used in aeroengines generally accounts for 20% - 30% of the total weight of the structure, mainly used for manufacturing compressor parts, such as forging titanium fans, compressor discs and blades, cast titanium compressor case, intermediate gearbox, bearing shell, etc. Spacecraft mainly uses the high specific strength, corrosion resistance and low temperature performance of titanium alloy to manufacture various pressure vessels, fuel tanks, fasteners, instrument ties, frames and rocket shells. Titanium alloy plate weldments are also used in man-made earth satellites, lunar pods, manned spacecraft and space shuttle.