The memory alloy spring is a combination of the material properties of the memory alloy and the functionality of the spring. When it is rolled tightly, it has more practical application temperature conditions, and it automatically restores its shape in the parent phase when unfolded. A 1mm extension of the Nitinol coil spring produces approximately 50g of force. Nickel-titanium coil springs have high elastic properties and can generate a relatively soft and stable continuous force under tension. Compared with the stainless steel wire of the same diameter, the rectification force released by the nickel-titanium wire drawing spring is 3.5-4 times different due to its high elasticity and extremely low permanent deformation rate.
1. It is used for super-elastic memory alloy mobile phone antennas, children's toy antennas, and optical glasses frames. With the development of the times, it is gradually used in women's body sculpting brackets. It is used as a scientific research material and frequently appears in various science and technology colleges. room.
2. One-way shape recovery using one-way shape memory effect. Such as pipe joints, antennas, collars, etc.
3. Extrinsic two-way memory recovery. That is to use the one-way shape memory effect and make repeated actions with the temperature rise and fall with the help of external force, such as thermal elements, robots, terminals, etc.
4. The application of superelasticity. Such as nitinol springs, binding posts, glasses frames, etc. The memory alloy material frame takes the spring made of memory alloy as an example. When the spring is placed in hot water, the length of the spring will be extended immediately, and then placed in cold water, it will immediately return to its original shape. The shape memory alloy spring can be used to control the water temperature of the bathroom water pipe. When the hot water temperature is too high, the "memory" function can be used to adjust or close the water supply pipe to avoid burns. It can also be made into a fire alarm device and a security device for electrical equipment. When a fire occurs, the spring made of memory alloy is deformed, and the fire alarm device is activated to achieve the purpose of alarm. A spring made of memory alloy can also be placed in the heating valve to maintain the temperature of the heating room. When the temperature is too low or too high, the heating valve can be automatically opened or closed.
5. The biocompatibility of TiNi alloy is very good, and there are quite a few medical examples using its shape memory effect and superelasticity. Such as thrombus filter, spinal orthopedic rod, dental orthopedic wire, bone plate, intramedullary needle, artificial joint, artificial heart WeChat pump, etc.