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Shape memory alloys for daily use
1. The shape memory valve has been developed in family life to prevent accidental scalding of hot water in sinks, bathtubs and bathrooms; these valves can also be used in hotels and other suitable places. If the water from the faucet reaches a temperature that is likely to burn when it is hot (about 48 ° C), the SMA actuated valve will close and will not reopen until the water temperature drops to a safe temperature.
2. The TiNi alloy is installed on the nose and ear of the spectacle frame to provide comfort and wear resistance, and because of the flexibility of TiNi alloy, they have been widely used to change the fashion world of glasses. Hyperelastic TiNi alloy wires are used as spectacle frames. Even if the lens is thermally expanded, shape memory alloy wires can maintain the lens through hyperelastic constant force. These hyperelastic alloys have a lot of deformability that ordinary frames cannot provide.
3. Cellular telephone antenna made of hyperelastic TiNi wire is another application of shape memory alloy. In the past, stainless steel antennas were often damaged by bending. TiNi shape memory alloy wire mobile phone antenna is popular because of its high destructive power. Therefore, it is usually used in the manufacture of cellular telephone antennas and fire inspection valves. In a fire, when the local temperature rises, the valve will automatically close to prevent the entry of dangerous gases. The advantage of this special design is that it can check the operation of the valve and then reset it to a safe state. The fire damper is used in semiconductor manufacturing and uses toxic gases in the diffusion process. Fire check valves can also be used in chemical and petroleum plants.
