The most significant difference between pure titanium and titanium alloys lies in: titanium alloys are based on pure titanium, adding chemicals such as Al, Mo, Cr, Sn and so on. It is because of these chemicals that these two kinds of titanium are found to differ in their properties.
1. Classification of pure titanium:
According to the content of impurities, titanium is divided into high-purity titanium (purity 99.9%) and industrial pure titanium (purity of 99.5%). Pure titanium has three grades, respectively TA sequence numbers 1, 2, 3, the larger the number, the lower the purity.
2. Properties of pure titanium:
Ti:4.507, g/cm3, Tm:1688 DEG. With allotropic transformation, is less than or equal to 882.5 DEG. is close packed six party structure of the alpha phase, more than 882.5 DEG. for a body centered cubic structure phase.
The strength of pure titanium is low, but it has high strength, good plasticity, low temperature toughness and high corrosion resistance.Titanium has good pressure processing performance and poor machinability. Titanium can burn when heated in nitrogen, so argon shall be used for heating and welding.
3. Use of pure titanium:
Great influence on the performance of titanium impurity content, impurities can significantly improve the strength of titanium, the titanium high strength, high strength close to Aluminum Alloy level, mainly used in the manufacture of petrochemical 350 DEG. temperature with heat exchanger, reactor, ships, aircraft and other parts.
4. Classification of titanium alloy:
Titanium is allotrope, melting point of 1668 DEG C, at less than 882 DEG C when a dense row of six square lattice structure, called alpha titanium. At 882 degrees Celsius, the bcc structure is called beta titanium.
The titanium alloys with different microstructure were obtained by adding proper alloy elements to the different characteristics of the above two structures of titanium and gradually changing their phase transformation temperature and phase content.
At room temperature, the titanium alloy has three kinds of matrix structure, and the titanium alloy is divided into the following three kinds: alpha alloy, (alpha + beta) alloy and beta alloy. China is represented by TA, TC and TB respectively.
5. Properties of titanium alloy:
Titanium alloy has the advantages of high strength, small density, good mechanical properties, good toughness and good corrosion resistance. In addition, titanium alloy has poor technological performance and difficult machining. It is easy to absorb hydrogen, nitrogen, carbon and other impurities in hot working.
6. Use of titanium alloy:
Titanium alloys are mainly used to make aircraft engine compressor parts, followed by rockets, missiles and high-speed aircraft structures. In the mid 60s, titanium and its alloys have been used in general industries to produce electrodes for the electrolytic industry, condensers for power stations, heaters for petroleum 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 in the production of hydrogen storage materials and shape memory alloys.
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