Ten Performance of Titanium Valve
Titanium valve mainly uses titanium metal material to have good stability and self passivation ability in strong corrosion environment, which can resist strong corrosion under various harsh conditions. Whether titanium valve can resist the corrosion of working environment medium depends on the chemical stability of the “passive oxide film” on its surface in the corrosive medium. For neutral, oxidizing, weak reducing medium environment, “passive oxide film” itself has good stability. For reducing corrosion media with high temperature or low PH value, in order to improve the stability of its “passive oxide film”, corrosion inhibitors (such as air, water, heavy metal ions and anions) can be added, such as titanium surface ion modification, anodizing, etc., to improve the corrosion resistance and surface hardness of “titanium” in reducing media to meet the use requirements.
Application of titanium valve
Titanium and titanium alloys are a new and promising metal material. It has the outstanding advantages of light weight, high strength, corrosion resistance, good pressure resistance, etc., and is widely used in aviation, space development, marine engineering, petroleum, chemical, light industry, food processing, metallurgy, power, medicine and health, instrumentation and other industries.
Titanium also has excellent seawater corrosion resistance and seawater scouring resistance, so it has become a “new star” in seawater corrosion resistant materials for ships, and has been widely used in ships, coastal power plants, and seawater desalination.
Ten Performance of Titanium Valve
1. Titanium in titanium valves has low density and high specific strength
The density of titanium metal is 4.51g/cm3, which is higher than that of aluminum and lower than that of steel, copper and nickel, but its specific strength is the first among metals.
2. Titanium valve has strong corrosion resistance
Titanium valve has strong corrosion resistance because its main metal material, titanium, is a very active metal, its equilibrium potential is very low, and its thermodynamic corrosion tendency in the medium is large. However, in fact, titanium is very stable in many media. For example, titanium is corrosion resistant in oxidizing, neutral and weak reducing media. This is because titanium and oxygen have a great affinity. In air or oxygen containing media, titanium surface generates a layer of dense, strong adhesion and inert oxide film, which protects titanium matrix from corrosion. Even due to mechanical wear, it will recover or regenerate quickly. This indicates that titanium is a metal with strong passivation tendency. The oxide film of titanium with medium temperature below 315 ° C 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, which have enhanced the protection of titanium oxide film and achieved the desired corrosion resistance. A series of corrosion-resistant titanium alloys, such as titanium molybdenum, titanium palladium and titanium molybdenum nickel, have been developed to meet the needs of metal materials in the production of sulfuric acid, hydrochloric acid, methylamine solution, high-temperature wet chlorine and high-temperature chloride. Titanium castings use titanium 32 molybdenum alloy, titanium 0.3 molybdenum 0.8 nickel alloy is used in the environment where crevice corrosion or pitting corrosion often occurs, or titanium equipment uses titanium 0.2 palladium alloy locally, all of which have achieved good results.
3. Titanium valve has good heat resistance
The new titanium alloy can be used for a long time at 600 ℃ or higher.
4. Titanium valve has good low temperature resistance
Low temperature titanium alloys represented by titanium alloys TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V) and Ti-2.5Zr-1.5Mo increase their strength with decreasing temperature, but their plasticity changes little. It can maintain good ductility and toughness at – 196-253 ℃ and avoid cold brittleness of metal. It is an ideal material for cryogenic vessels, tanks and other equipment.
5. Titanium valve has strong damping resistance
Compared with steel and copper, titanium has the longest vibration attenuation time after being subjected to mechanical vibration and electrical vibration. This property of titanium can be used as tuning fork, vibration element of medical ultrasonic mill and vibration film of advanced sound speaker.
6. Titanium valve is non-magnetic and non-toxic
Titanium is a non-magnetic metal, which will not be magnetized in a large magnetic field. It is non-toxic and has good compatibility with human tissues and blood, so it is adopted by the medical community.
7. The tensile strength of titanium valve is close to its yield strength
This property of titanium shows that its yield strength ratio (tensile strength/yield strength) is high, indicating that the plastic deformation of titanium metal is poor during forming. Due to the large ratio of yield limit to elastic modulus of titanium, the resilience of titanium during molding is large.
8. Titanium valve has good heat exchange 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. In addition, the heat transfer mode between the surface and steam is drop condensation, which reduces the heat group. The thermal resistance can also be reduced without scaling on the surface, which significantly improves the heat transfer performance of titanium.
9. Low elastic modulus of titanium valve
The elastic modulus of titanium is 106.4GMPa at room temperature, 57% of that of steel.
10. Suction performance of titanium valve
Titanium is a very active metal, which can react with many elements and compounds at high temperatures. Titanium gas absorption mainly refers to the reaction with carbon, hydrogen, nitrogen and oxygen at high temperature.
Source: China Titanium Valve Provider: www.titaniuminfogroup.com