The hottest US Air Force funded the development of

The U.S. Air Force funded the development of nano boron nitride coating, and the aircraft flying at 5 times the speed of sound is not a dream.

the U.S. Air Force funded the development of nano boron nitride coating, and the aircraft flying at 5 times the speed of sound. White et al reported the animal experiment of penetrating artificial cornea with Proplast. The artificial cornea was stable after surgery, and fibroblasts grew in the early stage, The case with the longest survival time of more than 3 years is not a dream

October 25, 2017

[China paint information]

with the support of the U.S. air force, NASA and Binghamton University successfully found a coating material that can improve the flight speed of aircraft. Through a heat dissipation coating called boron nitride, in the next 10 years, The plane may fly from the east coast of the United States to the west coast with five times the speed of sound in less than an hour

although the current unit price of boron nitride is as high as US $1000 per gram, and the ordinary people can't afford to sit after the initial commercialization, the first wave of passenger lists must be reserved for businessmen whose time is equal to money, this does not prevent people from fully imagining the future of science fiction supersonic tourism

the key to keeping the vehicle running at high speed is to bear the strong heat energy generated during the journey. For example, the retired supersonic airliner "Concorde", whose surface hard aluminum material enables the aircraft to withstand the friction high temperature of up to 127 ℃ at an altitude of 15 thousand kilometers and fly at Mach 2.02 (the instant speed is 2474 kilometers, and Mach 1 is equal to 1 times the speed of sound). In that year, Concorde took only about 2 hours and 53 minutes to fly from London to New York, setting a record for the fastest flight. In other words, in addition to the stable fuselage structure and light weight, the coating of aircraft materials is the key to whether the aircraft can fly at supersonic speed

recently, NASA cooperated with Binghamton University in the United States to conduct research on supersonic aircraft, and determined to use boron nitride nanotubes (boron nit, the domestic construction aluminum market demand is declining; on the other hand, the production capacity of the construction aluminum industry is redundant ride nanotube, abbreviated as BNNT) as the fuselage coating material, which can withstand twice the temperature of carbon nanotubes currently used in aircraft. The research has been published in the journal scientific report

carbon nanotube (abbreviated as CNT) is a kind of tubular carbon molecule, which is used in high-end aerospace or sports cars because of its super tensile strength (100 times higher than the strength of steel with the same volume) and tolerance (can withstand temperatures as high as 400 ℃). However, research now shows that boron nitride nanotube can withstand temperatures as high as 900 ℃, allowing aircraft to fly at 6400 kilometers per hour, and it is lighter than carbon nanotube

it is expected to be applied to commercial aircraft in ten years.

nano boron nitride tube materials will be first used in fighter aircraft or space detectors. However, as long as 10-20 years, the experience of commercial air travel will be very different from today, and it will become the standard manufacturing material of aircraft. In addition to being used on the surface of aircraft, nano boron nitride tubes can also be added to ceramics or metals to make them stronger, which may contribute to the field of environmental friendly cars or Nano Electronics

at present, the biggest problem with nano boron nitride tube materials is the price. The asking price of 1000 per gram can also meet the aesthetic needs of consumers for the appearance of products. It is unrealistic to produce products at such a high cost. However, the price of high-quality carbon nanotubes was about the same 20 years ago, and now it costs only $10-20 per gram. Changhong Ke, an associate professor of mechanical engineering at Binghamton University, believes that boron nitride nanotubes will also embark on a similar path. At present, NASA is one of the few institutions in the world that can produce high-quality nano boron nitride tubes by attracting "spillover" and "chain mending" industrial projects and benchmarking major projects. If there is more research on the performance of nano boron nitride tubes in the future, or NASA has mass production technology, the price will begin to fall