The F35, J-20 and T57 are Invisible Due to the External Coating Material Contain Tungsten?

The fifth generation fighter is in accordance with the epoch-making military standards for jet fighters. At present, the most advanced generation fighter of the world's active aircraft is characterized by the comprehensive application of low detectability technology, high mobility, advanced avionics system, highly integrated computer network, excellent battlefield situation awareness and information fusion power.

The most important rigid need of the five generations of fighters is "stealth", that is, how to cheat the tracking of "radar". The whole fighter needs to absorb or digest radar wave 360 degrees without dead angle. So the material of the fighter is very important. The most special material of the whole fighter needs to be conquered is cockpit glass. As the driver's close up window, it has higher requirements than other parts of the aircraft. It should not only have light transmittance, but also be able to prevent the impact of birds, as well as be able to block ultraviolet rays and have a high level of high temperature resistance and heat preservation. Of course, the final hard index can still be "invisible". Thanks to China's strong industrial manufacturing strength and rich strategic resources such as tungsten and rare earth, the material technology has made rapid progress in recent years, and most of the j-20's manufacturing materials completed independently are also natural.

You may think that tungsten is a kind of high-density metal, which will increase the weight of aircraft when used in aerospace tools, so it is difficult to apply it. Here, we need to separate the concept of tungsten alloy and nano tungsten oxide coating. Generally, the coating does not have much weight. So, what are the characteristics of tungsten oxide that can be used as absorbing materials for aircraft?

Nano tungsten oxide is a kind of n-type semiconductor material, which has unique physical properties such as photochromism, electrochromism, thermochromism and gas sensitivity. Its color change can be achieved by changing the irradiation wavelength, temperature or voltage. It can be widely used in the fields of photoconversion system, electrochemiluminescence, sensor devices, etc.

Among them, one-dimensional tungsten oxide nanowires are the most widely studied absorbing materials. Researchers have tested the electromagnetic wave absorbing performance of tungsten oxide nanowires. When the thickness of the absorbing layer of tungsten oxide nanowires is 1.5, the thickness of the absorbing layer is 1.5. At 16.7ghz, the maximum reflection loss is - 40.5db, which indicates that tungsten oxide nanowires are very good absorbing materials, can be applied in the field of electromagnetic mask technology and combat stealth technology, and can improve the compatibility of electromagnetic equipment, strengthen the protection of information technology, and better protect the health of personnel operating electromagnetic radiation equipment.

Not only for this, in the next generation of microwave absorbing materials research, there is also a nano coating called "chiral materials" which is focused on. Scientists have found in-depth research on tungsten oxide that the single-layer tungsten selenide composed of tungsten oxide and selenium is a very special "chiral" material. The phonon of this material vibrates collectively in the atomic crystal, and naturally rotates in a certain direction. This property is called chiral - similar to the left and right hands of human being, which mirror each other but are not identical. The characteristic material can reduce the reflection of the incident electromagnetic wave and absorb the electromagnetic wave. Compared with the general absorbing materials, the chiral materials have the advantages of high absorbing frequency and wide absorbing frequency band, and the absorbing characteristics can be improved by adjusting the rotating wave parameters. It has great potential in improving the absorbing performance and expanding the absorbing frequency, and is expected to become a new generation of fighter absorbing material in the future.

In addition to our j-20 coating materials, in fact, in addition to the engines, the coating technology, aerodynamic structure and material structure of our fifth generation fighters are no less than those of the F22 or F35 of Midea. In terms of coating technology alone, they may be more advanced. From the coating technology of j-20, we can see the great achievements in material science and technology industry in recent years. In addition, as China is a big raw material country of tungsten, molybdenum, rare earth and other basic rare metals, we have the most powerful raw material guarantee, and it is easy to produce high-quality nano tungsten oxide, rare earth oxide and other materials with high purity and performance. We believe that with the continuous progress of production and processing technology of rare earth metals such as tungsten and molybdenum and the leaping development of aviation industry, our aviation industry will develop in the future. Space technology material technology will be more and more advanced.

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