Rare earth magnetostrictive materials
When a substance is magnetized in a magnetic field, it will elongate or shorten in the direction of magnetization, which is called magnetostriction. The magnetostrictive value of general magnetostrictive materials is only 10-6-10-5, which is very small, so the application fields are also limited. However, in recent years, it has been found that there are alloy materials in rare earth alloys that are 102-103 times larger than the original magnetostriction. People refer to this material with great magnetostriction as rare earth giant magnetostrictive material.
Rare earth giant magnetostrictive materials are a new type of functional material newly developed by foreign countries in the late 1980s. Mainly refers to rare earth iron based intermetallic compounds. This type of material has a much larger magnetostrictive value than iron, nickel, and other materials. In recent years, with the continuous reduction of the cost of rare earth giant magnetostrictive materials (REGMM) products and the continuous expansion of application fields, the market demand has become increasingly strong.
Development of Rare Earth Magnetostrictive Materials
Beijing Iron and Steel Research Institute started its research on GMM preparation technology earlier. In 1991, it was the first in China to prepare GMM bars and obtained a national patent. Afterwards, further research and application were carried out on low-frequency underwater acoustic transducers, fiber optic current detection, high-power ultrasonic welding transducers, etc., and efficient integrated production GMM technology and equipment with independent intellectual property rights and an annual production capacity of tons were developed. The GMM material developed by Beijing University of Science and Technology has been tested in 20 units both domestically and internationally, with good results. Lanzhou Tianxing Company has also developed a production line with an annual production capacity of tons, and has made significant achievements in the development and application of GMM devices.
Although China’s research on GMM started not too late, it is still in its early stages of industrialization and application development. At present, China not only needs to make breakthroughs in GMM production technology, production equipment, and production costs, but also needs to invest energy in the development of material application devices. Foreign countries attach great importance to the integration of functional materials, components, and application devices. The ETREMA material in the United States is the most typical example of the integration of material and application device research and sales. The application of GMM involves many fields, and industry insiders and entrepreneurs should have a strategic vision, foresight, and sufficient understanding of the development and application of functional materials with broad application prospects in the 21st century. They should closely monitor the development trends in this field, accelerate its industrialization process, and promote and support the development and application of GMM application devices.
Advantages of Rare Earth Magnetostrictive Materials
GMM has high mechanical and electrical energy conversion rate, high energy density, high response speed, good reliability, and simple driving mode at room temperature. It is these performance advantages that have led to revolutionary changes in traditional electronic information systems, sensing systems, vibration systems, and so on.
Application of Rare Earth Magnetostrictive Materials
In the rapidly developing new century of technology, more than 1000 GMM devices have been introduced. The main application areas of GMM include the following:
1. In the defense, military, and aerospace industries, it is applied to underwater ship mobile communication, sound simulation systems for detection/detection systems, aircraft, ground vehicles, and weapons;
2. In the electronics industry and high-precision automatic control technology industries, micro displacement drives manufactured using GMM can be used for robots, ultra precision machining of various precision instruments, and optical disk drives;
3. Marine science and offshore engineering industry, survey equipment for ocean current distribution, underwater topography, earthquake prediction, and high-power low-frequency sonar systems for transmitting and receiving acoustic signals;
4. Machinery, textile, and automotive manufacturing industries, which can be used for automatic brake systems, fuel/injection injection systems, and high-performance micro mechanical power sources;
5. High power ultrasound, petroleum and medical industries, used in ultrasound chemistry, ultrasound medical technology, hearing aids, and high-power transducers.
6. It can be used in many fields such as vibration machinery, construction machinery, welding equipment, and high fidelity audio.
Rare earth magnetostrictive displacement sensor
Post time: Aug-16-2023