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Function of NiTi shape memory alloy
Nitinol shape memory alloy has been widely used in many fields because of its unique function as shape memory alloy, super elasticity, wear resistance and corrosion resistance.
1. Construction industry
The structure of NiTi shape memory alloy can enhance the damping of the system and reduce the dynamic response of the structure, so as to make various forms of damping energy dissipation devices. The isolator can also be designed with nitinol shape memory alloy. The deformation of NiTi shape memory alloy can increase the energy consumption of deformation and displacement, prevent the seismic energy of the structure from transferring to the upper part of the structure, thus protecting the superstructure and improving the seismic performance of the structure.
2. Mechanical engineering
Nitinol shape memory alloy was first used in the mechanical industry for pipe joints and fasteners. To be specific, nitinol shape memory alloy is used to process the shell whose outer diameter is 3% larger than the inner diameter at the joint of mechanical parts, pipelines, etc. and the refueling interface of the aircraft. 8% at a certain temperature. During assembly, the sleeve is taken out from liquid nitrogen and inserted into the pipe from both ends. If the temperature rises to room temperature, electric heating can be adopted. The temperature of air refueling joint is deformed, and the shape memory alloy and nickel titanium alloy shape memory alloy sleeve are shrunk to form a tight seal, so as to achieve tight air leakage, which is much higher than the traditional welding effect. Therefore, nitinol shape memory alloy is especially suitable for aerospace, ship, oil pipeline and other fields. In inconvenient places, pins made of nitinol shape memory alloy can be inserted into the holes for heating. Therefore, the temperature sensitivity of NiTi shape memory alloy is used to drive multiple functions to produce robots and manipulators.
3. Automobile industry
Nitinol shape memory alloy is mainly used in engine exhaust fan clutch, exhaust nozzle and diesel radiator.
4. Medical field
Nitinol shape memory alloy is widely used in medical field because of its high mechanical properties and biocompatibility. In fact, thrombus filter is a new product of nitinol shape memory alloy. After the straightener is inserted into the vein, it gradually forms a network structure over time, thus preventing more than 90% of blood clots from flowing to organs such as heart and lung. In addition, nitinol shape memory alloy is also used in medical clinical trials, such as surgical suture, artificial joint, artificial heart, etc.
5. Aerospace industry
In the aircraft hydraulic system, basically every aircraft needs to use 800 nitinol shape memory alloy joints. Since the 1970s, most of them have failed in the US Navy. In addition, nitinol shape memory alloy can also be used in spacecraft antenna, electromechanical actuator and so on.
