With the development of modern science and technology, the impact of electromagnetic radiation on the environment is increasing. At the airport, aircraft flights cannot be taken off due to electromagnetic interference; in hospitals, mobile phones often interfere with the normal operation of various electronic diagnostic instruments. Therefore, to control electromagnetic pollution, to find a material that can withstand and weaken electromagnetic radiation, absorbing materials, has become a major issue in materials science.
The so-called absorbing material refers to a type of material that absorbs the energy of electromagnetic waves projected onto its surface. In engineering applications, in addition to requiring the absorbing material to have a high absorption rate for electromagnetic waves in a wide frequency band, it is also required to have light weight, temperature resistance, moisture resistance, corrosion resistance and the like.
As early as during the Second World War, the United States, Britain, Germany and other countries began a large amount of exploratory work on electromagnetic wave absorbing materials for radar electronic reconnaissance and anti-reconnaissance for their respective military purposes. In the United States in the 1960s, absorbing materials were applied to the Air Force's F-14, F-15, F-18 fighters and F-117 stealth aircraft. Since the 1980s, countries around the world have invested heavily in increasing research on absorbing materials. With the rapid development of telecommunications services, absorbing materials have also been applied to communications, environmental protection and human protection.
Electromagnetic radiation causes direct and indirect damage to the human body through thermal effects, non-thermal effects, and cumulative effects. Studies have confirmed that ferrite absorbing materials have the best performance, and it has the characteristics of high absorption band, high absorption rate and thin matching thickness. The application of such a material to an electronic device can absorb the leaked electromagnetic radiation, thereby achieving the purpose of eliminating electromagnetic interference. According to the law that electromagnetic waves propagate from the low magnetic direction to the high magnetic permeability direction in the medium, the high magnetic permeability ferrite is used to guide the electromagnetic wave, and the radiant energy of the electromagnetic wave is absorbed by the resonance, and the energy of the electromagnetic wave is converted into thermal energy by coupling.
High-rise buildings in the city, high-rise buildings reflecting electromagnetic waves will cause heavy shadows. Applying absorbing materials to building materials can solve this problem. Microwave chambers made of absorbing materials can be widely used in radar, communications and aerospace. In addition, absorbing materials also have broad application space in improving the compatibility of airborne and airborne radar equipment and improving the performance of the whole machine.
On the surface of various radar targets, absorbing materials are applied to reduce the effective reflection cross section of the weapon system, so that these weapons are easy to break through the enemy radar's defense zone. This is a powerful means of anti-radar reconnaissance and also a weapon reduction system. A method of attack by infrared guided missiles and laser weapons. Absorbing materials can also be used for airport navigation equipment such as landing lights, masts on decks, decks, submarine's periscope brackets or ventilation ducts.
Applying absorbing materials to various electronic products, such as TVs, stereos, VCDs, computers, game consoles, microwave ovens, mobile phones, can reduce electromagnetic wave leakage to national health safety limits (10 microwatts per square centimeter) To ensure the health of the human body. It can be applied to high-power radar, microwave medical device and microwave breaker to protect operators from electromagnetic radiation.
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