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Titanium Alloys Are Used To Make High Precision Parts
Jul 25, 2018

The advantages of using titanium in automobile are self-evident, which can greatly reduce the quality, reduce the fuel consumption, improve the working efficiency, improve the environment and reduce the noise. The key is how to reduce the cost of titanium and its alloy parts to an acceptable level. According to research, if the traditional production technology is adopted, the cost of rolling titanium products is 4.4usd /kg. According to general experience, the cost of each processing step should be doubled, so the cost of materials should reach at least 17.6usd /kg. The cost of rolling products is up to $44USD/kg after they are made into final machined parts. Obviously, it is impossible to replace the corresponding steel parts with such titanium. However, the use of powder metallurgy titanium material is very different. If the available price of titanium sponge powder or residue is 4.4-8.8usd /kg, the cost of pure or near-pure pressed blank will be lower than 4.4usd /kg. After the minimum amount of machining, the cost of connecting rod and other parts is 8.8 to 11USD/kg. Powder metallurgy can not only use low cost raw materials, but also reduce the cost of machining, especially the method of net shape or near net shape is an effective way to produce large size and low price auto parts. It can be seen that powder metallurgy titanium material has a strong competitiveness.


Titanium, with a high strength to mass ratio, high strength at high temperature, corrosion resistance and thermal stability, is widely concerned with a series of superior properties, but the traditional USES of titanium and titanium alloys are mainly in the aerospace and navigation industries. The restriction factor of civil titanium material is product cost. Titanium powder metallurgy is a production method of titanium parts completely different from other technologies. Powder metallurgy can limit the waste associated with the production of traditional titanium without the need for vacuum arc remelting, electron beam melting or plasma arc melting. Powder can form any shape or rolled product directly, reducing the amount of raw materials needed to make a part and producing more. This process can also produce near-net parts, reducing the waste usually associated with the production of traditional parts, reducing the process steps and increasing the output. However, there are still some problems to be improved in powder metallurgy, the most important of which is pollution control. Any pollution will make the metal unsuitable for high precision parts. High structural standards in the aerospace field make it difficult for titanium alloy to appear in the aviation market, but it can be applied to civil fields with less strict structural requirements. Among them, the industry most likely to be applied on a large scale is the automobile industry. The automobile market is very large, once the application of titanium in the automobile industry is promoted, its use of titanium will far exceed the current aerospace and aerospace market.


Application prospect of civil titanium material:

At present, the powder metallurgy titanium alloy has been applied to the new type of high-performance automobiles, mainly used in the engine system and chassis, such as replacing alloy steel and stainless steel with titanium alloy in the engine system to make valves, springs and connecting rods and other parts. On the chassis mainly used for spring, exhaust system, half shaft and various fasteners. Toyota motor corporation of Japan has developed a new method of PM forging which can reduce the cost effectively. The titanium valve of automobile engine can reduce weight by 40% by this method. The inlet valve is made of ti-6al-4v alloy through the forging process of powder metallurgy, and the exhaust valve is made of composite material. The composite material is made of a new alloy powder with boron as the intensifier, and the volume fraction of TiB reinforced powder is about 5%. The matrix composition is ti-6al-4sn-4zn-1mo-0.2si-0.3 O, which has excellent creep resistance.

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