Introduction of excellent properties of titanium in modern society
First, the density is small, higher than the intensity
The density of titanium metal is 4.51g/cm3, higher than aluminum but lower than steel, copper, nickel, but the specific strength is located in the first metal.
Second, corrosion resistance
Titanium is a very vivid metal, its equilibrium potential is very low, the thermodynamic corrosion tendency in the medium is large. But in fact, titanium is very stable in many media, such as oxidation, neutral and weak reduction of titanium in the medium is corrosion resistant. This is because titanium and oxygen have a great affinity, in the air or in the medium containing oxygen, titanium surface formation of a dense, strong adhesion, lazy large oxidation film, protect the titanium matrix from corrosion. Even due to mechanical wear will quickly self - healing or regeneration. This indicates that titanium has a strong passivation tendency. Titanium oxide film with medium temperature below 315℃ always maintains this characteristic.
In order to improve the corrosion resistance of titanium, surface treatment technologies, such as oxidation, electroplating, plasma spraying, ion nitriding, ion implantation and laser treatment, have been developed to enhance the protective effect of titanium oxide film and obtain the expected corrosion resistance. A series of corrosion resistant titanium alloys such as ti-mo, ti-pd, ti-mo - ni have been developed to meet the demand of metal materials in the production of sulfuric acid, hydrochloric acid, methylamine solution, high temperature and humidity chlorine gas and high temperature chloride. Ti-32 molybdenum alloy is used in titanium casting, ti-0.3 molybdenum-0.8 nickel alloy is used in crevice corrosion or pitting corrosion environment, or ti-0.2 palladium alloy is used in titanium equipment, all of which have good application effect.
Good heat resistance
The new titanium alloys can be used for a long time at temperatures of 600℃ or higher.
Good low temperature resistance
Titanium alloy TA7 (ti-5al-2.5sn), TC4 (ti-6al-4v) and ti-2.5zr-1.5 Mo are represented by low-temperature titanium alloy. The strength increases with the decrease of temperature, but the plasticity changes little. Good ductility and endurance at -196-253℃, avoiding cold brittleness of metal, it is an ideal material for cryogenic containers, storage boxes and other equipment.
5. Strong anti-damping function
Compared with steel and copper, titanium has the longest time to decay due to mechanical and electrical oscillation. This function of titanium can be used as tuning fork, vibration element of ultrasonic crusher in medical science and vibration film of high-grade loudspeaker.
Vi. Non-magnetic and non-toxic
Titanium does not have magnetism metal, won't be magnetized also in very big magnetic field, nontoxic and with human body arrangement and blood have good intermiscibility, be used by medical treatment bound so.
The tensile strength is close to the yield strength
This function of titanium indicates that its bending strength ratio (tensile strength/yield strength) is high, which indicates that the metal titanium data have poor plastic deformation during forming. Due to the ratio of the yield limit and elastic modulus of titanium, the springback ability of titanium molding is large.
Eight, good heat transfer function
Although the thermal conductivity of titanium is lower than that of carbon steel and copper, the wall thickness can be greatly reduced due to the excellent corrosion resistance of titanium, and the appearance and steam heat transfer mode is drip condensation, reducing the heat group, too appearance without scaling can also reduce the thermal resistance, significantly improving the heat transfer function of titanium.
Low elastic modulus
The elastic modulus of titanium at room temperature is 106.4GMPa, which is 57% of steel.
Ten, inhale function
Titanium is a very chemically active metal that reacts with many elements and compounds at high temperatures. Titanium inhalation mainly refers to high temperature and carbon, hydrogen, nitrogen, oxygen response.
The density of titanium metal is 4.51g/cm3, higher than aluminum but lower than steel, copper, nickel, but the specific strength is located in the first metal.
Second, corrosion resistance
Titanium is a very vivid metal, its equilibrium potential is very low, the thermodynamic corrosion tendency in the medium is large. But in fact, titanium is very stable in many media, such as oxidation, neutral and weak reduction of titanium in the medium is corrosion resistant. This is because titanium and oxygen have a great affinity, in the air or in the medium containing oxygen, titanium surface formation of a dense, strong adhesion, lazy large oxidation film, protect the titanium matrix from corrosion. Even due to mechanical wear will quickly self - healing or regeneration. This indicates that titanium has a strong passivation tendency. Titanium oxide film with medium temperature below 315℃ always maintains this characteristic.
In order to improve the corrosion resistance of titanium, surface treatment technologies, such as oxidation, electroplating, plasma spraying, ion nitriding, ion implantation and laser treatment, have been developed to enhance the protective effect of titanium oxide film and obtain the expected corrosion resistance. A series of corrosion resistant titanium alloys such as ti-mo, ti-pd, ti-mo - ni have been developed to meet the demand of metal materials in the production of sulfuric acid, hydrochloric acid, methylamine solution, high temperature and humidity chlorine gas and high temperature chloride. Ti-32 molybdenum alloy is used in titanium casting, ti-0.3 molybdenum-0.8 nickel alloy is used in crevice corrosion or pitting corrosion environment, or ti-0.2 palladium alloy is used in titanium equipment, all of which have good application effect.
Good heat resistance
The new titanium alloys can be used for a long time at temperatures of 600℃ or higher.
Good low temperature resistance
Titanium alloy TA7 (ti-5al-2.5sn), TC4 (ti-6al-4v) and ti-2.5zr-1.5 Mo are represented by low-temperature titanium alloy. The strength increases with the decrease of temperature, but the plasticity changes little. Good ductility and endurance at -196-253℃, avoiding cold brittleness of metal, it is an ideal material for cryogenic containers, storage boxes and other equipment.
5. Strong anti-damping function
Compared with steel and copper, titanium has the longest time to decay due to mechanical and electrical oscillation. This function of titanium can be used as tuning fork, vibration element of ultrasonic crusher in medical science and vibration film of high-grade loudspeaker.
Vi. Non-magnetic and non-toxic
Titanium does not have magnetism metal, won't be magnetized also in very big magnetic field, nontoxic and with human body arrangement and blood have good intermiscibility, be used by medical treatment bound so.
The tensile strength is close to the yield strength
This function of titanium indicates that its bending strength ratio (tensile strength/yield strength) is high, which indicates that the metal titanium data have poor plastic deformation during forming. Due to the ratio of the yield limit and elastic modulus of titanium, the springback ability of titanium molding is large.
Eight, good heat transfer function
Although the thermal conductivity of titanium is lower than that of carbon steel and copper, the wall thickness can be greatly reduced due to the excellent corrosion resistance of titanium, and the appearance and steam heat transfer mode is drip condensation, reducing the heat group, too appearance without scaling can also reduce the thermal resistance, significantly improving the heat transfer function of titanium.
Low elastic modulus
The elastic modulus of titanium at room temperature is 106.4GMPa, which is 57% of steel.
Ten, inhale function
Titanium is a very chemically active metal that reacts with many elements and compounds at high temperatures. Titanium inhalation mainly refers to high temperature and carbon, hydrogen, nitrogen, oxygen response.
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