Characteristics Of Titanium
Ten characteristics of titanium
1、 Low density and high specific strength
The density of titanium is 4.51g/cm3, which is higher than that of aluminum and lower than that of steel, copper and nickel, but its specific strength is the first of metals!!
2、 Strong corrosion resistance:
Titanium is a very active metal, its equilibrium potential is very low, and its thermodynamic corrosion tendency in the medium is large. But in fact, titanium is stable in many media, such as oxidation, neutral and weak reducibility media is corrosion-resistant.
3、 Good high temperature resistance
The new titanium alloy can be used for a long time at 600 ℃ or higher.
4、 Good low temperature resistance
Low temperature titanium alloys, such as TA7 (ti-5al-2.5sn), TC4 (Ti-6Al-4V) and ti-2.5zr-1.5mo, are representative of low-temperature titanium alloys. Their strength increases with the decrease of temperature, but the plasticity changes little. It has good ductility and toughness at - 196-253 ℃ and avoids cold brittleness of metal. It is an ideal material for cryogenic vessels and tanks.
5、 Strong damping resistance
Compared with steel and copper, titanium has the longest vibration attenuation time after mechanical vibration and electrical vibration.
6、 Non magnetic, non-toxic:
Titanium is a non-magnetic metal, which will not be magnetized in a large magnetic field. It is non-toxic and has good compatibility with human tissues and blood, so it is used in the medical field.
7、 The tensile strength is close to its yield strength
This property of titanium indicates that its yield strength ratio (tensile strength / yield strength) is high, which indicates that the plastic deformation of titanium is poor during forming. Due to the large ratio of yield limit and elastic modulus of titanium, the springback ability of titanium during forming is large.
8、 Good heat transfer performance
Although the thermal conductivity of titanium is lower than that of carbon steel and copper, due to its excellent corrosion resistance, the wall thickness can be greatly reduced. Moreover, the heat transfer mode between the surface and the steam is dropwise condensation, which reduces the heat group. The thermal resistance can also be reduced if there is no scaling on the surface, so the heat transfer performance of titanium is significantly improved.
9、 Low elastic modulus:
The elastic modulus of titanium is 106.4 MPa at room temperature, which is 57% of that of steel.
10、 Inspiratory performance:
Titanium is a kind of metal with very active chemical properties. It can react with many elements and compounds at high temperature. Titanium getter mainly refers to the reaction with carbon, hydrogen, nitrogen and oxygen at high temperature.
Three functions of titanium
Functional materials are engineering materials with physical properties, which have special properties in electricity, magnetism, sound, light and heat, or show special functions under their action. It has been found that titanium and titanium alloys have three special functions and have a bright future
1、 Memory function:
Ti Ni alloy is considered to be the best shape memory alloy because of its unidirectional, bidirectional and omnidirectional memory effects at a certain ambient temperature. In engineering, pipe joints are used for the oil pressure system of fighter planes; the oil pipeline system of oil complex enterprises; the parabolic mesh antenna with a diameter of 500 mm made of 0.5 mm wire is used in aerospace vehicles; in medical engineering, it is used for snoring treatment; screws are made for fracture healing, etc. The above applications have achieved obvious results.
2、 Superconducting function:
When the temperature is lower than the critical temperature, Nb Ti alloy exhibits zero resistance superconductivity.
3、 Hydrogen storage function:
Ti Fe alloy has the characteristics of hydrogen absorption, which can store a large amount of hydrogen safely and release hydrogen in a certain environment. It has a bright future in hydrogen separation, hydrogen purification, hydrogen storage and transportation, hydrogen heat pump and battery manufacturing.
