The launching of this year's Zhuhai Airshow is getting closer and closer, and the majority of aviation enthusiasts are constantly paying attention to the dynamics of this “blue sky event”. For example, which models will exhibit? Which models will be dynamically displayed? In the first two days, the online news said that the annihilate-20, which the military fans were looking forward to, did not appear on a list of so-called exhibitors. After seeing it, the author immediately felt that the blue sky was eclipsed a lot. Fortunately, this morning, an enthusiastic netizen photographed four annihilate-20 debuts at Zhuhai Jinwan Airport, and the two-machine formation was used for adaptation training. According to experts, this may mean that there will be four annihilate-20 on the same stage at the Zhuhai Air Show next month, and this will undoubtedly become the biggest highlight of this year's Zhuhai Air Show.

In this regard, some netizens said that they did see it, flying very low, flying low and the like. The author also saw some very humorous remarks, such as:

- Isn't annihilate-20 invisible? Why can you still shoot?

- I saw it, not invisible.

- Is it not a stealth aircraft?

- Is it not a stealth fighter? How can I still see it? ......

Some netizens are humorously new_ing to:

- There is no meaning for Ma Po and Mapo Tofu.

- Invisible to the enemy, visible to yourself. You can see it and explain it to yourself.

- This is a one-way anti-stealth camera, commonly known as SLR, to understand. ......

A single-lens reflex camera is actually an abbreviation for a single-lens reflex framing camera. It refers to a camera that uses a single lens and that illuminates the mirror through the lens through a reflective viewfinder.

Some netizens are the truth:

- It is radar stealth, not visual stealth.

What the author wants to say today is the radar stealth in the stealth technology of the warplane. This has to start with stealth materials. Nowadays, radar stealth requires stealth materials to be lighter in weight and more adaptable. The new stealth materials mainly include Nano stealth materials, chiral materials, high temperature absorbing materials, plasma absorbing materials, smart materials, salt absorbents, polycrystalline iron fiber absorbents and conductive high molecular polymer materials.

Among them, chiral materials refer to materials with chiral characteristics. Chirality refers to the phenomenon that an object does not have geometric symmetry with its mirror image and cannot overlap the image with any image by any operation; the high temperature absorbing material mainly includes ceramic fiber, ceramic matrix composite and C/C material. According to reports, the absorbing materials made of ceramic-based materials in the United States can withstand the high temperature of 1093 °C after being added to the tail nozzle of the F-117 stealth aircraft. For plasma absorbing materials, it is reported that Russia has developed A new plasma stealth technology for its fifth-generation fighters; smart materials are materials that have unique physical and chemical properties as sensors, and control dings in materials with sensing and driving dings. Smart materials not only have a stealth effect on radar waves, but also have good stealth effects on visible light and sound waves. The US military laboratory is studying the use of smart stealth materials to make the hood to reduce the noise signal, so as to achieve the purpose of stealing sound waves.

Nanomaterials are a commonly used absorbing material. The "super black" nanomaterials developed by the United States have absorbed up to 99% of radar waves. It is reported that in recent years, it has been found that Nano-tungsten oxide materials have excellent absorbing properties, and the small size effect, interface effect and quantization effect caused by their special structure lead to special properties different from conventional materials, for example, It has high absorption rate for electromagnetic waves in a wide frequency band, and also has resistance to high and low temperatures, moisture resistance, and high corrosion resistance. Moreover, Nano-tungsten oxide is an n-type semiconductor material with unique properties such as photochromism, electrochromism and gaschromism. The color change can be achieved by changing the irradiation wavelength, changing the temperature or applying a voltage, which may mean It has more research and development value on the stealth coating of fighter aircraft.

Moreover, after nearly two decades of development, research on stealth technology and stealth materials has made great progress. Take the US military as an example: its first-generation products such as the F117 stealth fighter, the second-generation products such as the B2 stealth bomber, and the third-generation products such as the F22 and other stealth fighters have been equipped with the US military and used for many years. And our army is also equipped with the annihilate-20 stealth fifth-generation fighter.

Today's aircraft coating materials with advanced infrared detectors, laser radar, meter wave radar, millimeter wave radar and other advanced detection equipment and guided weapons have been developed in the direction of multi-spectral compatible with multi-band electromagnetic wave stealth. Foreign advanced multi-dingal stealth materials have made great progress in the integration of visible light, near-infrared, far-infrared, 8mm and 3mm five-band. China has also developed multi-band camouflage masks, using visible light, infrared, radar compatible stealth design technology to achieve multi-band stealth.

Do you have some understanding of the stealth technology and materials of stealth fighters like the annihilate-20? In any case, it’s only seven days since the Zhuhai Air Show was launched. Let’s wait and see!

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