The hottest Tiangong-1 is about to take off. Rocke

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"Tiangong-1" is about to take off. Rocket paint is escorting

on September 20, 2011, Jiuquan Satellite Launch Center, with a clear sky. At 9:00 sharp, "Tiangong-1" was seated on the 70 meter high long march-2f carrier rocket, and was successfully transferred to the launch site along a 1500 meter long seamless rail after 1 hour and 7 minutes of movement. At this point, the highly anticipated "Tiangong-1" officially entered the countdown to launch

Tiangong-1 is the name of China's first space laboratory. China will launch the target spacecraft "Tiangong-1" from 2010 to the end of 2011 to dock with Shenzhou-8, shenzhou-9 and shenzhou-10 spacecraft respectively. So as to establish the first Chinese space laboratory. On September 20, 2011, a spokesman for China's manned space program announced that Tiangong-1 would be launched from September 27 to 30 in Jiuquan. The Tiangong-1 target aircraft and the long march-2f carrier rocket assembly have been transferred to the launch area

rapid development of rocket coatings

modern aerospace technology is developing rapidly. China, the United States, Russia and other countries have their own stable rocket series. The rocket is a collection of many high-tech technologies, among which the high-tech special coating puts a thin and tough protective coat on the rocket

everyone knows that to send an artificial satellite into space, a space rocket with great thrust is required, and the flight speed of the rocket is required to be more than 8 kilometers per second. At such a fast speed, the friction between the rocket shell and the atmosphere will produce a high temperature of thousands of degrees. At the same time, when the rocket engine works, it also ejects a high-temperature airflow of several thousand degrees Celsius. In this way, the rocket has to withstand a high temperature of several thousand degrees Celsius. Generally speaking, the shell of the rocket is made of titanium alloy, beryllium alloy and aluminum alloy, which are easy to heat transfer. If the shell of the rocket is directly exposed to such high temperature, the strength of the shell of the rocket will be greatly weakened. The high temperature of several thousand degrees will soon spread to the interior of the rocket, burning all kinds of automatic control instruments and electronic components of the rocket, and the rocket will not be able to fly normally according to the predetermined orbit. In order to prevent the high temperature of thousands of degrees from entering the rocket and make various instruments in the rocket work normally, people try to paint the rocket shell with a light and thin special coating - ablation resistant and heat insulation coating. Coating with this paint is like putting an asbestos coat on the rocket, and the rocket will fly safely in the atmosphere

new technology escorts rocket launch

most coatings are based on organic resins. Why does it have the performance of non combustion and heat insulation at high temperature? Through long-term scientific experiments, scientists have found that as long as an organic resin containing silicon, phosphorus, nitrogen, boron, chlorine and other elements is synthesized, it has high temperature resistance cm3/(n · m); And self extinguishing. If some inorganic fillers (such as silica, mica powder, carbon boron fiber, etc.) and sublimates (such as selenium oxide, mercury sulfide, etc.) are added to this kind of high temperature resistant resin, a coating with high temperature resistance and good heat insulation performance can be prepared

this special coating can be closely covered on the shell of the rocket by the general methods of brushing, spraying and scraping. When the rocket flies at high speed in the atmosphere, the heat generated by the friction between the rocket shell and the air flow gradually volatilizes the sublimated substances in the coating. At the same time, the high temperature resistant organic resin forms a microporous carbonized layer. In this process, although the coating surface melts, it also takes away part of the heat and guarantees the quality through a third-party guarantee. The left carbonized layer is like a thermal barrier, isolating most of the external heat

of course, when the rocket is flying at high speed, the air flow may wash away this layer of carbon layer, but the thickness of the coating is designed according to the rocket flight time, the coating ablation speed and the thermal insulation effect of the coating. A layer of carbonized layer was washed away, and there were "successors", and the coating without carbonization began to "go through fire and water" until the rocket completed its flight mission

coating for the support that supports the smooth launch of the rocket

the author learned that in fact, the paint used on the tower is no different from other steel structures. The paint used on the Xichang launch tower constructed by Taiyuan Heavy Industry was alkyd paint. When the rocket is launched, the supports around it may be impacted by short-term high temperature, and some of them will melt away. Some high-temperature paint should be painted on the surrounding columns to prevent the high temperature from seriously damaging the support. In the past, high-temperature aluminum paint was used around the rocket

the author will now introduce the 35 steel cone rib joint. The protector high temperature paint of the lower rocket support is a kind of protection that can work on high-temperature surfaces for a long or short time, and has excellent heat resistance that ordinary paint does not have! At present, the most commonly used types of high-temperature paint are organosilicon element high-temperature paint and inorganic high-temperature paint. Organosilicon resin is a kind of resin that can withstand high temperature. Inorganic high-temperature paint can withstand 1700 ℃ for a long time and feel insulation and other characteristics. It is an indispensable raw material in the preparation of high-temperature paint! Therefore, if you want to understand high-temperature paint, you must first understand silicone high-temperature resin:

silicone resin is a thermosetting plastic, and one of its most prominent properties is excellent thermal oxidation stability. After heating at 250 ℃ for 24 hours, the weight loss of silicone resin is only 2 ~ 8%. Another outstanding performance of silicone resin is excellent electrical insulation, which can maintain its good insulation performance in a wide range of temperature and frequency. Generally, the electrical breakdown strength of silicone resin is 50 kV/mm, the volume resistivity is 1013 ~ 1015 ohm cm, the dielectric constant is 3, and the dielectric loss tangent is about. In addition, silicone resin also has excellent moisture resistance, waterproof, rust prevention, cold resistance, ozone resistance and weather resistance. It has good corrosion resistance to most aqueous chemical reagents such as dilute mineral acids, but poor solvent resistance

as a high-tech coating, rocket coating has made its own contribution to China's high-tech cause

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