Titanium Alloy Can be Used in Some Car Parts
Exhaust valve in addition to the requirements of heat resistance, wear resistance, but also do not contain lead and cobalt, the United States automobile company uses titanium alloy to manufacture intake and exhaust valves, intake valves with Ti Gr.5, exhaust valves using Ti-6Al-2Sn-4Zr-2Mo alloy.Japanese automobile company, racing car valve seat is generally made of Ti Gr.5 alloy, but also Ti-5Al-2Cr-1Fe alloy. The exhaust pipe is made of titanium alloy tail nozzle/return pipe member can not be corroded by chlorine salt and sulfur exhaust gas, even the weld will not be corroded,and is 8.20kg lighter than the traditional stainless steel exhaust system, improving fuel efficiency, speeding up the speed capacity, shorten the braking distance.
The mass of titanium alloy muffler is only 5.00kg~6.00kg,much lighter than stainless steel, and the muffler of Japanese cars has almost all titanium alloyed. General Motors (GM) Chevron's titanium muffler and exhaust pipe system weighs only 11.80kg, 41% lighter than the 20kg of stainless steel, and a little stronger. Japan Datong iron and Steel Company developed Ti-33.5Al-1Nb-0.5Cr-0.5Si alloy is a good material for the manufacture of engine exhaust valve, has good oxidation resistance and creep resistance, compared with the traditional martensitic heat-resistant steel and nickel alloy exhaust valve, titanium alloy outstanding characteristics: small density, good heat resistance, at the same time above 540℃ has higher strength properties, and creep resistance is higher than nickel alloy, as well as good wear resistance.
The actual use proves that the service life of the titanium exhaust system is the same as the life of the car, 12a~14a, the service life of the stainless steel device is only 8 a, from this point to consider the use of titanium is more cost-effective. Titanium alloy muffler quality is generally <12g, more than 40% lighter than stainless steel, help to improve the performance of the car, and the service life of the muffler is semi-permanent.Titanium and titanium alloy is fully inert, can be completely recycled and does not drop the paper grade,in the production process will not bring any harmful by products.
Valve seat ring has a wide range of applications in racing and sports cars, 2020 world production is estimated to exceed 600,000 pieces, usually made of Titanium Gr.5 alloy, can be manufactured by mechanical cutting method, processing costs are not high, and does not require special surface treatment, Japan Mitsubishi company uses Ti-5Al-2Cr-1Fe alloy to manufacture valve seat ring.
● Titanium Spring
In terms of strength, density and modulus of elasticity, titanium alloy is a good material for making springs. TC4 alloy was used to make Porsche 917 racing springs nearly 20 A. Ford Motor Company replaced the steel spiral suspension springs in the past with springs made of RMI Picture c alloy in racing cars, but the high production cost limited its wide application. Later titanium metal company (Timet) developed Fe, Mo﹣based new Ti-4.5Fe-6.8Mo-1.5Al alloy, called low cost picture titanium alloy LCB (Low Cost Beta), not only to maintain the advantages of the picture c alloy, but also has a reasonable price, used in the manufacture of springs, can be processed with the original steel spring production equipment, with the support of Volkswagen Company, the spring manufactured is 1/3 lighter than steel, and the price of the original picture titanium alloy decreased by 50%, more valuable, the height of the titanium alloy spring is 1/3 lighter than steel, and the price of the original picture titanium alloy decreased by 50%, more valuable, the height of the titanium alloy spring is 1/3 lighter than steel, and the price of the original picture titanium alloy decreased by 50%, more valuable, the height of the titanium alloy spring is 1/3 lighter than steel, and the price of the original picture titanium alloy decreased by 50%, more valuable, the height of the titanium alloy spring is 1/3 lighter than steel, and the price of the original picture titanium alloy decreased by 50%. The steel spring is 50% to 80% shorter, meaning that you can get more ride and load space.
Titanium alloy springs also have a more prominent advantage—high corrosion resistance, in the standard salt spray corrosion fatigue test, the fatigue life of steel springs than in the air decreased by 50%, while titanium alloy springs decreased by only 4%, in addition, titanium alloy springs do not require protective surface treatment.
● Titanium Fasteners and Brakes
Titanium alloy because of its high corrosion resistance, light weight and low coefficient of thermal expansion and other advantages, its fasteners in aerospace manufacturing has been more widely used, if its production costs have a greater decline, will become a common fastener of cars.Titanium thermal conductivity and wear resistance is low,can not be applied in the brake impeller, but because of its excellent corrosion resistance, has been used to prepare the brake system dynamic connection flange sealing ring and brake liner guide pin, but also because of its small thermal conductivity, the brake fluid also has a certain protective effect.
