Application of two-way memory alloy

Because of its many excellent properties, shape memory alloys are widely used in many fields such as aerospace, machinery and electronics, biomedicine, bridge construction, automobile industry and daily life.

1. Aerospace industry: Shape memory alloys have been applied to aviation and space devices. For example, the low temperature mating connector used in the hydraulic system of military aircraft, Europe and the United States are developing shape memory alloy materials used in the intelligent horizontal rotors of helicopters.

2. Mechanical and electronic products: In 1970, the United States used shape memory alloys to make low-temperature mating connectors for F-14 combat, and then there were more than millions of connecting pieces.

3. Biomedicine: TiNi shape memory alloy used in the medical field should not only use its shape memory effect or superelasticity, but also meet the requirements of chemistry and biology, that is, good biocompatibility.

4. Building structure: Utilizing the pseudo-elastic properties and dynamic damping properties of shape memory alloys, shape memory alloys are used to passively control structures affected by earthquakes and play an anti-seismic role. Should be applied to the active damping control of structural vibration.

Extended information:

Daily life function of shape memory alloy:

1. Anti-scald valve In family life, the developed shape memory valve can be used to prevent accidental scalding of hot water in the sink, bathtub and bathroom; these valves can also be used in hotels and other suitable places.

If the temperature of the water flowing out of the faucet reaches a temperature (approximately 48°C) that may burn people, the shape memory alloy drives the valve to close, and the valve does not reopen until the water temperature drops to a safe temperature.

2. Spectacle frame The assembly of TiNi alloy on the nose bridge and ears of the spectacle frame can make people feel comfortable and wear-resistant. Due to the flexibility of TiNi alloy, they have been widely used to change the fashion industry of glasses.

The superelastic TiNi alloy wire is used as the frame of the glasses. Even if the lens thermally expands, the shape memory alloy wire can clamp the lens by the superelastic constant force. Glasses frames made of these superelastic alloys have great deformability, which ordinary glasses frames cannot.

3. Mobile phone antennas and fire check valves. The use of super-elastic TiNi wires as cellular phone antennas is another application of shape memory alloys. In the past, stainless steel antennas were used, and damage often occurred due to bending. The use of TiNi shape memory alloy wire for mobile phone antennas with high destructive resistance is generally welcomed by people.

Therefore, it is often used to make cellular phone antennas and fire check valves. In a fire, the valve will automatically close when a local area heats up, preventing dangerous gas from entering.

The advantage of this special structure design is that it has the ability to check the operation of the valve, and then it can be reset to a safe state; this kind of fire check valve is used in the semiconductor manufacturing industry, and toxic gases are used in the diffusion process of the semiconductor manufacturing; This fire check valve can also be used in chemical and petroleum plants.