Advantages of titanium coils
1) Excellent corrosion resistance in many media
2) Smooth surface, no scale layer
3) Low density, high strength, and therefore lightweight
Titanium heat exchanger
Ten properties of titanium in titanium coils:
1) Low density, high specific strength
The density of metallic titanium is 4.51g/cm3, which is higher than aluminum and lower than steel, copper, and nickel. Its strength is the largest among metals.
2) Corrosion resistance
Titanium is a very active metal. Its equilibrium potential is very low, and its thermodynamic corrosion tendency in the medium is very high. But titanium is very stable and corrosion-resistant in various media such as oxidizing, neutral and weakly reducing media. This is because titanium and oxygen have a strong affinity. In oxygen-containing air or medium, a dense, strongly adherent, and inert oxide film is formed on the titanium surface to protect the titanium matrix from corrosion. Even due to mechanical wear, it can self-recover or reduce. This shows that titanium is a metal with a strong tendency to passivate, and the titanium oxide film with a medium temperature below 315°C has also maintained this characteristic.
To increase the corrosion resistance of titanium coils, surface treatment techniques such as oxidation, electroplating, plasma spraying, ion nitriding, ion implantation, and laser treatment have been developed to increase the protection of the titanium oxide film and achieve the expected corrosion resistance. To meet the needs of metal materials such as sulfuric acid, hydrochloric acid, methylamine solution, high-temperature wet chlorine, and high-temperature chloride, a series of corrosion-resistant titanium alloys such as titanium-molybdenum, titanium-palladium, and titanium-molybdenum-nickel have been developed. Titanium castings are made of titanium 32 molybdenum alloy. Ti-0.3 molybdenum-0.8 nickel alloy or Ti-0.2 palladium alloy is used locally in an environment where crevice corrosion or pitting corrosion often occurs, and good efficiency has been achieved.
Titanium coil
3) Good heat resistance
The new titanium alloy can be used for a long time at 600°C or higher.
4) Good low-temperature resistance
Low-temperature titanium alloys represented by titanium alloys TA7 (Ti-5 Al-2.5Sn), TC 4 (Ti-6 Al-4V), and Ti-2.5Zr-1.5Mo increase in strength as the temperature decreases, but the plasticity does not change much. It maintains good ductility and toughness at low temperatures of -196-253℃, avoiding metal cold brittleness, and is an ideal material for low-temperature containers, storage tanks, and other equipment.
5) Good damping resistance
Compared with steel and copper metals, the vibration attenuation time of titanium coils itself is longer after mechanical vibration and electrical vibration. This property of titanium can be used to make tuning forks, academic pulverizer vibration elements, and vibration films of audio speakers.
6) Non-magnetic and non-polluting
Titanium is a non-magnetic metal that will not be magnetized in a large magnetic field. It is stain-free, has good compatibility with human tissue and blood, and is used by the academic community.
7) 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, indicating that the plastic deformation of titanium metal during the forming process is poor. Due to the large ratio of titanium's yield strength to elastic modulus, the resilience of titanium during the forming process becomes larger.
8) Good heat transfer performance. Although the thermal conductivity of titanium metal is lower than that of carbon steel and copper, due to its excellent corrosion resistance, its wall thickness can be greatly reduced. The heat transfer mode between the surface and the steam is droplet condensation, which reduces the heat group. cooling is performed on the surface, the heat group can also be reduced. Since there is no scaling on the surface, the heat transfer performance of titanium can be significantly increased.
9) Low elastic modulus. The elastic modulus of titanium is 106.4GMPa at room temperature, which is 57% of steel.
10) Air absorption performance. titanium coils are a very active metal that can react with many elements and compounds at high temperatures. Titanium inhalation mainly refers to the reaction with carbon, hydrogen, nitrogen, and oxygen at high temperatures.
