Ten major properties of titanium

Ten major properties of titanium 1. Low density and high specific strength Titanium has a density of 4.51g/cm3, which is higher than aluminum but lower than steel, copper, and nickel, but its specific strength is at the top of the metal. 2. Corrosion resistance Titanium is a very active metal, its equilibrium potential is very low, and the thermodynamic corrosion tendency in the medium is high. But in fact, titanium is very stable in many media. For example, titanium is corrosion-resistant in oxidizing, neutral and weakly reducing media. This is because titanium and oxygen have a great affinity. In the air or in an oxygen-containing medium, a dense, strong adhesion and inert oxide film is formed on the surface of titanium, which protects the titanium matrix from corrosion. Even due to mechanical wear, it will quickly heal itself or regenerate. This indicates that titanium is a metal with a strong tendency to passivation. The titanium oxide film always maintains this characteristic when the medium temperature is below 315℃. 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 to enhance the protection of the titanium oxide film and obtain the desired corrosion resistance. Effect. In response to the need for metal materials in the production of 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 use titanium-32 molybdenum alloy, titanium-0.3 molybdenum-0.8 nickel alloy is used in environments where crevice corrosion or pitting corrosion is common, or titanium-0.2 palladium alloy is used locally in titanium equipment, and they are all well used. Effect. 3. Good heat resistance. The new titanium alloy can be used for a long time at a temperature of 600°C or higher. Four, good low temperature resistance, low temperature titanium alloy represented by titanium alloy TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V) and Ti-2.5Zr-1.5Mo, its strength increases with the decrease of temperature , But the plastic change is not big. It maintains good ductility and toughness at low temperatures of -196-253℃, avoids cold brittleness of metals, and is an ideal material for cryogenic containers, storage tanks and other equipment. 5. Strong resistance to damping. Titanium has the longest vibration decay time compared with steel and copper after being subjected to mechanical and electrical vibrations. This performance of titanium can be used as a tuning fork, medical ultrasonic pulverizer vibrating element and high-end acoustic speaker vibrating film, etc. 6. Non-magnetic and non-toxic Titanium is a non-magnetic metal, and 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 profession. Seven, the tensile strength and its yield strength are close to that of titanium. This property shows that its yield ratio (tensile strength/yield strength) is high, and it means that the plastic deformation of the metal titanium material is poor during forming. Due to the large ratio of the yield limit of titanium to the modulus of elasticity, the resilience of titanium during molding is large. 8. Good heat transfer performance Although the thermal conductivity of metallic titanium is lower than that of carbon steel and copper, due to the excellent corrosion resistance of titanium, the wall thickness can be greatly reduced, and the heat exchange between the surface and the steam is dropwise condensation, reducing In addition to the heat group, the heat resistance can be reduced without fouling on the surface, and the heat transfer performance of titanium is significantly improved. 9. Low modulus of elasticity The modulus of elasticity of titanium is 106.4GMPa at room temperature, which is 57% of steel. 10. Gettering performance Titanium is a chemically very active metal, which can react with many elements and compounds at high temperatures. Titanium getter mainly refers to the reaction with carbon, hydrogen, nitrogen, and oxygen at high temperatures.