Main uses of memory metal
志联
2025-05-06
Shape memory alloy Industrial applications
1. One-way shape recovery utilizing the one-way shape memory effect, such as pipe fittings, antennas, and hose clamps.
2. External two-way memory recovery. In other words, utilizing the one-way shape memory effect, with the help of external force, it can perform repetitive actions with temperature changes, such as thermal sensitive components, robots, and terminals.
3. Internal two-way memory recovery, that is, utilizing the two-way memory effect, performing repeated actions with temperature increase and decrease, such as heat engines and heating elements. However, this type of application has fast memory decay and poor reliability, and is not commonly used.
4. Superelastic applications, such as springs, terminals, and eyeglass frames.
Memory alloys are particularly suitable for heat engines and constant temperature automatic control. At room temperature, it is made into an automatic opening and closing arm. Vents can open during sunny days and automatically close at night when the room temperature drops. There are many design schemes for alloy heat engines, all of which can work between two media with very small temperature differences. This opens up a new path for the utilization of industrial cooling water, nuclear reactor residual heat, ocean temperature difference, and solar energy. The current widespread problem is low efficiency, only 4%~6%, which needs further improvement.
Shape memory alloy Applications
Shape memory alloy There are many successful examples of applications in the aerospace field. Large antennas on satellites can be made of shape memory alloys. Before satellite launch, the parabolic antenna is folded and placed inside the satellite. After the rocket launches and sends the satellite into its predetermined orbit, it only needs heating. The folded satellite antenna naturally unfolds due to its "memory" function, restoring its parabolic shape.
Shape memory alloys are widely used in clinical medicine and play an irreplaceable role in modern medicine.
Shape memory alloys are also closely related to our daily lives. Taking a spring made of shape memory alloy as an example, if it is placed in hot water, the length of the spring will immediately lengthen, and then placed in cold water, it will immediately recover. Shape memory alloy springs can be used to control the water temperature of bathroom faucets. When the hot water temperature is too high, the "memory" function can be used to adjust or close the water supply pipe to avoid scalding. It can also be made into fire alarm devices and safety devices for electrical equipment. When a fire occurs, the spring made of shape memory alloy will deform and activate the fire alarm device to achieve the purpose of alarm. A spring made of shape memory alloy can also be placed in a heating valve to maintain the temperature of a greenhouse, automatically opening or closing the heating valve when the temperature is too low or too high.
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