Top 10 properties of titanium

◆ Low density, high specific strength: the density of titanium is 4.51g/cm3, higher than aluminum and lower than steel, copper, nickel, but the specific strength is in the first metal.

◆ Corrosion resistance: Titanium is a very active metal, its equilibrium potential is very low, in the medium of thermodynamic corrosion tendency. But in fact titanium is very stable in many media, such as titanium in oxidizing, neutral and weak reducing media is corrosion resistant.

Good heat resistance: the new titanium alloy can be used for a long time at 600℃ or higher temperature.

◆ Good low temperature resistance: Ti-5Al-2.5Sn, Ti-6Al-4V and Ti-2.5Zr-1.5Mo are representative of low temperature titanium alloys, whose strength increases with the decrease of temperature, but the plastic change is little. It maintains good ductility and toughness at -196-253℃ to avoid cold brittleness of metal. It is an ideal material for low temperature containers, storage tanks and other equipment.

◆ Strong damping resistance: titanium metal by mechanical vibration, electrical vibration, compared with steel, copper, its own vibration attenuation time is long.

◆ Non-magnetic, non-toxic: titanium is a non-magnetic metal, in a large magnetic field will not be magnetized, non-toxic and has a good compatibility with human tissue and blood, so it is used by the medical community.

◆ The tensile strength is close to its yield strength: the performance of titanium shows that its strength ratio (tensile strength/yield strength) is high, indicating that the metal titanium material in forming plastic deformation. Because the ratio of yield limit to elastic modulus of titanium is large, the springback ability of titanium forming is large.

◆ Good heat exchange performance: although the thermal conductivity of titanium metal is lower than carbon steel and copper, but because of the excellent corrosion resistance of titanium, so the wall thickness can be greatly reduced, and the surface and steam heat exchange mode for drop condensation, reduce the heat group, too surface no scaling can also reduce the thermal resistance, so that the heat exchange performance of titanium significantly improved.

◆ Low elastic modulus: the elastic modulus of titanium is 106.4GMPa at room temperature, which is 57% of steel.

◆ Inspiratory performance: Titanium is a very active metal with chemical properties. It can react with many elements and compounds at high temperature. Titanium aspiration 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, that is, materials with special properties in electricity, magnetism, sound, light, heat, etc., or with special functions under their action. Studies of titanium and titanium alloys have found that they have three specific functions and promising applications:

1. Memory function: Ti-Ni alloy has unidirectional, bidirectional and omnidirectional memory effect at a certain ambient temperature, and is recognized as a better memory alloy. In engineering to do pipe joint for fighter oil pressure system; The pipeline system of the petroleum complex; 500mm diameter parabolic mesh antenna made of 0.5mm diameter wire is used in aerospace aircraft; Used in medical engineering to make snoring treatment; Made into screws for fracture healing and so on. The above applications have obtained obvious results.

2. Superconducting function: Niobium-titanium alloy shows zero resistance superconducting function when the temperature is below the critical temperature.

3. Hydrogen storage function: titanium-iron alloy has the characteristics of hydrogen absorption, storing a large amount of hydrogen safely, and releasing hydrogen in a certain environment. This is promising for hydrogen separation, hydrogen purification, hydrogen storage and transportation, and the manufacture of hydrogen heat pumps and storage batteries.