Advantages of titanium coil:
- Excellent corrosion resistance in many media
- The surface is smooth and clean, no scale layer
- Small density and high strength, so light weight
Titanium heat exchanger
Ten properties of titanium in titanium coil:
- Small density and high specific strength
The density of titanium metal is 4.51g / cm3, which is higher than aluminum and lower than that of steel, copper, and nickel. The strength is larger among metals.
- Corrosion resistance
Titanium is a very active metal. Its equilibrium potential is very low, and its thermodynamic corrosion tendency in the medium is high. But in fact, titanium is very stable in various media such as oxidizing, neutral and weakly reducing, and has corrosion resistance. This is because titanium and oxygen have a strong adhesion. In the oxygen-containing air or medium, the titanium surface forms a dense, strong adhesion and inert oxide film to protect the titanium substrate from corrosion. Even if it is due to mechanical wear, it can recover or restore itself. This shows that titanium is a metal with a strong tendency to passivation, and the titanium oxide film with a medium temperature below 315 ° C has always maintained this characteristic.
In order to increase the corrosion resistance of titanium, surface treatment skills 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. In order to meet the needs of sulfuric acid, hydrochloric acid, methylamine solution, high temperature wet chlorine, high temperature chloride and other metal materials, a series of corrosion-resistant titanium alloys such as titanium molybdenum, titanium palladium, titanium molybdenum nickel, etc. have been developed. The titanium casting is made of titanium 32 molybdenum alloy. Ti-0.3 molybdenum-0.8 nickel alloy or Ti-0.2 palladium alloy is locally used in environments where crevice corrosion or pitting corrosion often occurs, and good efficiency is achieved.
- Good heat resistance
The new titanium alloy can be used for a long time at 600 ℃ or higher.
- Good low temperature resistance
Titanium alloy TA7 (Ti-5 Al-2.5Sn), TC 4 (Ti-6 Al-4V) and Ti-2.5Zr-1.5Mo are low-temperature titanium alloys, whose strength increases with decreasing temperature, but plasticity It hasn’t changed much. It maintains good ductility and toughness at a low temperature of -196-253 ° C, avoiding the cold brittleness of metals, and is an ideal material for low-temperature containers, storage tanks and other equipment.
- Good resistance to damping
After titanium metal is subjected to mechanical vibration and electrical vibration, its own vibration decay time is longer than that of steel and copper metal. Using this property of titanium, it can be used as a tuning fork, an academic shredder vibration element, and an acoustic speaker vibration film.
- Non-magnetic and non-polluting
Titanium is a non-magnetic metal that will not be magnetized in a large magnetic field. It is non-polluting, has good compatibility with human tissues and blood, and is used by academia.
- The tensile strength is close to its yield strength
This property of titanium shows that its yield strength ratio (tensile strength / yield strength) is higher, indicating that the plastic deformation of titanium metal during the forming process is poor. Due to the large ratio of titanium yield and elastic modulus, the resilience of titanium during the forming process becomes larger.
- 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, its wall thickness can be greatly reduced. The heat transfer between the surface and the steam is droplet condensation, which reduces the heat Cooling on the surface can also reduce heat groups. Since there is no scaling on the surface, it can obviously increase the heat transfer performance of titanium.
- Low elastic modulus
The elastic modulus of titanium at normal temperature is 106.4GMPa, which is 57% of steel.
- Inspiratory performance
Titanium is a very active metal that can react with many elements and compounds at high temperatures. Titanium gettering mainly refers to the reaction with carbon, hydrogen, nitrogen and oxygen at high temperature.