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The top ten properties of titanium
Titanium is a very reactive metal with a low equilibrium potential, making it prone to thermodynamic
Low density,high specific strength
The density of titanium is 4.51g/cm3,higher than aluminum but lower than steel,copper,and nickel,yet its specific strength ranks first among metals.
Corrosion resistance
Titanium is a very reactive metal with a low equilibrium potential,making it thermodynamically prone to corrosion in various media.However,titanium is quite stable in many environments;it is corrosion-resistant in oxidizing,neutral,and weakly reducing media.This is due to titanium's strong affinity for oxygen,which forms a dense,strongly adherent,and inert oxide film on its surface in air or oxygen-containing media,protecting the titanium substrate from corrosion.Even mechanical wear can quickly self-heal or regenerate.This indicates that titanium has a strong passivation tendency.The oxide film on titanium maintains this characteristic at temperatures below 315°C.
To enhance the corrosion resistance of titanium,surface treatment technologies such as oxidation,electroplating,plasma spraying,ion nitriding,ion implantation,and laser treatment have been developed,which enhance the protective effect of the oxide film and achieve the desired corrosion resistance.In response to the needs for metal materials in production involving sulfuric acid,hydrochloric acid,methylamine solutions,high-temperature humid chlorine gas,and high-temperature chlorides,a series of corrosion-resistant titanium alloys such as titanium-molybdenum,titanium-palladium,and titanium-molybdenum-nickel have been developed.Titanium castings use titanium-32 molybdenum alloy,while titanium-0.3 molybdenum-0.8 nickel alloy is used in environments prone to crevice corrosion or pitting,and titanium-0.2 palladium alloy is used locally in titanium equipment,all achieving excellent results.
Good heat resistance
New titanium alloys can be used for long periods at temperatures of 600°C or higher.
Good low-temperature performance
Low-temperature titanium alloys represented by TA7(Ti-5Al-2.5Sn),TC4(Ti-6Al-4V),and Ti-2.5Zr-1.5Mo exhibit increased strength as the temperature decreases,but their plasticity changes little.They maintain good ductility and toughness at low temperatures of-196 to-253°C,avoiding metal cold brittleness,making them ideal materials for low-temperature containers and storage tanks.
Strong damping performance
Titanium metal has a longer self-damping time compared to steel and copper after being subjected to mechanical and electrical vibrations.This property of titanium can be utilized in tuning forks,ultrasonic crushing devices in medicine,and vibration membranes in high-end audio speakers.
Non-magnetic,non-toxic
Titanium is a non-magnetic metal that will not be magnetized even in strong magnetic fields.It is non-toxic and has good compatibility with human tissues and blood,which is why it is adopted in the medical field.
Tensile strength is close to its yield strength
This property of titanium indicates a high ratio of tensile strength to yield strength,reflecting poor plastic deformation of titanium materials during forming.The large ratio of titanium's yield limit to its elastic modulus gives titanium a significant rebound ability during forming.
Good heat exchange performance
Although the thermal conductivity of titanium is lower than that of carbon steel and copper,its excellent corrosion resistance allows for significantly thinner wall thicknesses.Additionally,the heat exchange method with steam is droplet condensation,which reduces thermal groups,and the titanium surface does not scale,further reducing thermal resistance and significantly improving titanium's heat exchange performance.
Low elastic modulus
The elastic modulus of titanium at room temperature is 106.4GPa,which is 57%of that of steel.
Gas absorption performance
Titanium is a chemically very reactive metal that can react with many elements and compounds at high temperatures.Gas absorption in titanium mainly refers to reactions with carbon,hydrogen,nitrogen,and oxygen at high temperatures.
Titanium,Metal,Corrosion
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