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Ten properties of titanium

2018/7/12 21:22:00 Viewers:
1. The density is small and the intensity is higher.
The density of titanium is 4.51g/cm3, higher than aluminum and lower than steel, copper and nickel, but the strength is located at the top of metal.
2. Corrosion resistance
Titanium is a very active metal, its equilibrium potential is very low, and its thermodynamic corrosion tendency is large in the medium. But titanium is very stable in many media, such as titanium, which is corrosion resistant in oxidizing, neutral and weak reducing media. This is because titanium and oxygen have a great affinity. In the air or in the oxygen containing medium, the titanium surface produces a dense, strongly adhesive and inert oxide film, which protects the titanium matrix from being corroded. Even mechanical wear will quickly heal itself or regenerate. This indicates that titanium is a metal with strong passivation tendency. The oxide film of titanium at medium temperature below 315 degrees keeps this characteristic.
In order to improve the corrosion resistance of titanium, the surface treatment technologies such as oxidation, electroplating, plasma spraying, ion nitriding, ion implantation and laser treatment have been studied, which have enhanced the protective effect of the titanium oxide film, and obtained the desired corrosion resistance. A series of corrosion resistant titanium alloys, such as titanium molybdenum, titanium - palladium, titanium - molybdenum - nickel, have been developed for the needs of metal materials in the production of sulfuric acid, hydrochloric acid, methylamine solution, high temperature wet chlorine gas and high temperature chloride. Titanium -32 molybdenum alloy was used in titanium castings, and titanium -0.3 molybdenum -0.8 nickel alloy or titanium equipment was used locally for the application of titanium -0.2 palladium alloy for the environment of frequent crack corrosion or pitting.
3. Good heat resistance
Usually, aluminum at 150 degrees C and stainless steel lose its original performance at 130 degrees centigrade, while the new titanium alloy still maintains good mechanical properties at 600 temperature or higher. When the airplane speed reaches 2.7 times of the speed of sound, the surface temperature of the aircraft structure reaches 230 degrees.
Titanium has good heat resistance. It can be used in aero-engine, rear fuselage and heat affected parts of engine.
4. Good resistance to low temperature
Titanium alloys, such as TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V) and Ti-2.5Zr-1.5Mo, are represented by low temperature titanium alloys, and their strength increases with the decrease of temperature, but the plastic changes are not significant. It keeps good ductility and toughness at -196-253 C and avoids the cold brittleness of metal. It can be used in liquid nitrogen, liquid oxygen rocket engine, or the ideal material of cryogenic vessels and tanks on manned spaceship.
5. Strong anti damping performance
When metal titanium is subjected to mechanical vibration and electric vibration, its self vibration attenuation time is the longest compared with steel and copper metal. This property of titanium can be used as a vibrating element for tuning fork, medical ultrasonic grinder and vibrating loudspeaker for advanced loudspeaker.
6. Special functions of non-magnetic, non-toxic, titanium and alloy.
Titanium is a non-magnetic metal and will not be magnetized in a large magnetic field. It is nontoxic and has good compatibility with human tissues and blood, so it is adopted by the medical profession.
1. memory function
TiNi alloy has the ability to restore its original shape at certain temperature.
2. superconducting function
NbTi alloy exhibits superconductivity at a specific low temperature.
3. hydrogen absorption function
The TiFe alloy has a large amount of hydrogen absorbing ability, which can be used to store hydrogen safely.
7, the tensile strength is close to the yield strength.
This property of titanium indicates that its yield strength ratio (tensile strength / yield strength) is high, indicating the poor plastic deformation of titanium materials during forming. Because the ratio of the yield limit to the elastic modulus of titanium is large, the resilience of titanium during forming is large.
8. Good heat transfer performance
Although the thermal conductivity of metal titanium is lower than that of carbon steel and copper, the wall thickness can be greatly reduced because of the excellent corrosion resistance of titanium, and the heat transfer mode of the surface and steam is dripping condensing, reducing the heat group, reducing the surface without scaling and reducing the thermal resistance, so that the heat transfer performance of the titanium is greatly improved.
9. Low modulus of elasticity
The elastic modulus of titanium is 106.4GMPa at room temperature, 57% of steel.

10, inspiratory performance
Titanium is a highly reactive metal which can react with many elements and compounds at high temperatures. Titanium getter mainly refers to reaction with carbon, hydrogen, nitrogen and oxygen at high temperature.