Ten properties of titanium

Ten properties of titanium

1. Low density and high specific strength

The density of titanium is 4.51g/cm3, which is higher than that of aluminum, but lower than that of steel, copper and nickel.

2. 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. This is because titanium has a great affinity with oxygen. In air or oxygen containing medium, a dense, strong adhesion and inert oxide film is formed on the surface of titanium, which protects the titanium matrix from corrosion. Even due to mechanical wear, it will self heal or regenerate quickly. This indicates that titanium is a metal with strong passivation tendency. When the medium temperature is below 315 ℃, this characteristic is always maintained.

3. Good heat 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. This property of titanium can be used as tuning fork, vibration element of medical ultrasonic pulverizer and vibrating film of high-grade sound loudspeaker.

6. Non magnetic and 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. 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. Without scaling on the surface of titanium, the thermal resistance can be reduced, and the heat transfer performance of titanium is significantly improved.

8. Low elastic modulus

The elastic modulus of titanium is 106.4gpa at room temperature, which is 57% of that of steel.

9. 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.

10. 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.