Functional materials are engineering materials based on physical properties, that is, materials with special properties in electrical, magnetic, acoustic, optical, thermal, etc., or materials that exhibit special functions under their action. Studies on titanium and titanium alloys have found that they have three special functions for application:
- Memory function: Titanium-nickel alloy has a one-way, two-way and all-round memory effect at a certain ambient temperature and is recognized as the best memory alloy. Pipe joints for oil pressure systems for fighters; oil pipeline systems for oil joint ventures; 500mm diameter parabolic mesh antennas made of 0.5mm wire for aerospace vehicles; for snoring in medical engineering Treatment; making screws for fracture healing. All of the above applications have achieved significant results.
- Superconducting function: Niobium-titanium alloy exhibits zero-resistance superconducting function when the temperature is lower than the critical temperature.
- Hydrogen storage function: Titanium-iron alloy has the characteristics of hydrogen absorption, which stores a large amount of hydrogen safely and releases hydrogen in a certain environment. This is promising for hydrogen separation, hydrogen purification, hydrogen storage and transportation, and the manufacture of heat pumps and batteries that use hydrogen as an energy source.
Here are ten characteristics of Titanium:
◆ Low density and high specific strength: The density of metallic titanium is 4.51g/cm3, which is higher than aluminum and lower than steel, copper and nickel, but the specific strength is at the top of metal.
◆ Corrosion resistance: Titanium is a very active metal with a low equilibrium potential and a high degree of thermodynamic corrosion in the medium. However, titanium is very stable in many media, such as titanium, which is resistant to corrosion in media such as oxidizing, neutral, and weakly reducing.
◆ Good heat resistance: The new titanium alloy can be used for a long time at 600 °C or higher.
◆ Good low temperature resistance: Titanium alloys TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V) and Ti-2.5Zr-1.5Mo are representative of low temperature titanium alloys. Their strength increases with decreasing temperature, but the plasticity changes little. At a low temperature of -196-253 ° C, they can maintain good ductility and toughness, avoiding the cold and brittleness of metals, and are ideal materials for cryogenic vessels, tanks and other equipment.
◆ Strong anti-damping performance: After being subjected to mechanical vibration and electrical vibration, metal titanium has the longest vibration decay time compared with steel and copper metal.
◆ Non-magnetic, non-toxic: Titanium is a non-magnetic metal, it will not be magnetized in a large magnetic field, non-toxic and has good compatibility with human tissues and blood, so it is used by the medical community.
◆ Tensile strength is close to its yield strength: This property indicates that its yield ratio (tensile strength/yield strength) is high, indicating that the metal titanium material has poor plastic deformation during forming. Since the ratio of the yield limit of titanium to the modulus of elasticity is large, the resilience of titanium during molding is large.
◆ Good heat transfer performance: Although the thermal conductivity of titanium is lower than that of carbon steel and copper, the wall thickness can be greatly reduced due to the excellent corrosion resistance of titanium, and the heat exchange between surface and steam is droplet condensation. In the heat group, the surface is not fouled and the thermal resistance can be reduced, so that the heat exchange performance of titanium is remarkably improved.
◆ Low modulus of elasticity: The modulus of elasticity of titanium is 106.4 GMPa at room temperature, which is 57% of steel.
◆ Suction performance: Titanium is a very chemically active metal that reacts with many elements and compounds at high temperatures. Titanium inhalation mainly refers to the reaction with carbon, hydrogen, nitrogen and oxygen at high temperature.
For more information about titanium metal and titanium alloy, please visit http://www.samaterials.com/7-titanium.