Application of titanium alloy materials in automobiles

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Titanium alloy is a new type of structural and functional material. It has excellent comprehensive properties, low density and high specific strength. The density of titanium is 4.51g/cm3, which is between aluminum (2.7g/cm3) and iron (7.6g/cm3). The specific strength of titanium alloy is higher than that of aluminum alloy and steel, and the toughness is equivalent to that of steel. Titanium and titanium alloys have good corrosion resistance, better than stainless steel, especially in the marine atmosphere, they resist the corrosion of chloride ions and have good corrosion resistance in a micro-oxidizing atmosphere. The working temperature of titanium alloys is wider, and low temperature titanium alloys are at -253℃. It can also maintain good plasticity, and the working temperature of heat-resistant titanium alloy can reach about 550°C, and its heat resistance is significantly higher than that of aluminum alloy and magnesium alloy. At the same time, it has good processability and welding performance.

The uses of titanium in automobiles are mainly divided into two categories. The first category is used to reduce the mass of internal combustion engine reciprocating parts (for internal combustion engine parts that perform reciprocating motion, even reducing the mass of a few grams is important); the second category It is used to reduce the total mass of the car. According to the design and material characteristics, titanium is mainly distributed in engine components and chassis parts in the new generation of automobiles. In the engine system, titanium can be used to make parts such as valves, valve springs, valve spring holders and connecting rods; in the chassis parts are mainly springs, exhaust systems, half shafts and fasteners.

According to the information, in addition to the above mentioned key points, there are also: rocker arms, suspension springs, piston pins, turbocharger rotors, fasteners, lug nuts, car stop brackets, door projection beams, brakes Caliper piston, pin pin, clutch disc, pressure plate, shift button, etc.

Ways to reduce the cost of titanium alloys. Although titanium and titanium alloys entered the field of automobile manufacturing as early as the 1950s, their development was relatively slow, mainly due to price factors. In order to satisfy the use of titanium in the automobile industry, titanium manufacturers carried out smelting, processing, and manufacturing. A lot of work. To meet the needs of the automotive industry.

Titanium has a high melting point and very active chemical properties. It has a strong chemical affinity with elements such as O, H, N, and C, which makes it difficult to extract pure titanium. The Kroll magnesium reduction method commonly used in industry produces sponge titanium. The Kroll magnesium reduction method produces sponge titanium with a complex process, high energy consumption, long cycle time, and cannot be continuously produced. At the same time, a large amount of metallic magnesium is required as a reducing agent, and the production cost is relatively high.

Another reason for the high price of titanium alloy is the high price of alloying elements. With the advancement of titanium smelting technology, it is an effective method to reduce the cost of raw materials to add scraps and scraps generated in the production and processing of titanium as furnace charge after a series of treatments to achieve recycling. Practice has shown that for every 1% of residual titanium used, the production cost of titanium ingots can be reduced by 0.8%. If an electron beam cooling bed furnace or a plasma beam cooling bed furnace is used for smelting, not only the metallurgical quality of titanium ingots can be improved, but also a large amount of recycled charge can be used, effectively reducing the cost of ingot casting.