The reporter learned from Central South University on the 21st that the team of the academician of the Powder Metallurgy National Laboratory of Central South University, Huang Boyun, developed a new type of ceramic coating resistant to 3000 °C ablation and its composite materials through a large number of experiments. The discovery may be hypersonic. The development of aircraft has paved the way.

Professor Xiong Xiang from the Institute of Powder Metallurgy, Central South University, said that hypersonic flight means that its flight speed is equal to or greater than 5 times the speed of sound, that is, at least 6,120 kilometers per hour. At such a high speed, the flight from Beijing to New York can be completed within 2 hours, provided that the key structural components of the aircraft can withstand severe air friction and hot air impact of up to 2000-3000 ° C without being damaged. . The newly discovered ultra-high temperature ceramic coatings and composite materials from Central South University provide better protection for the above components.

This ceramic is a multi-component boron-containing single-phase carbide with a stable carbide crystal structure composed of four elements: Zr, Ti, C and B. The R&D team introduced the multi-ceramic phase into the porous carbon/carbon composite by infiltration process, and obtained a very promising new Zr-Ti-CB ceramic coating modified carbon/carbon composite.

“Because this ultra-high temperature ceramic combines the high temperature adaptability of carbides with the anti-oxidation properties of boride, the above coatings and composites exhibit superior ablation resistance and thermal shock resistance, which is the key to hypersonic vehicles. The promising candidates for the parts," said Xiong Xiang.

The research results of the team research and development were published on June 15th in Nature Communications. The State Key Laboratory of Powder Metallurgy of Central South University is the first completion unit of the paper. Professor Xiong Xiang is the first correspondent and Zeng Yi The doctor is the first author. The partner unit, the University of Manchester, UK, characterized and analyzed the material.

Once published, the article has received extensive attention from foreign academic circles and the media. In the first three days after the publication, the download volume exceeded 5,000 times, while the other articles published on the same day were downloaded 300-900 times. The British "Daily Mail", "The Economist", the United States "Yahoo", "Public Machinery", Russia's "Satellite News Agency" and other dozens of mainstream media and authoritative academic institutions in the world have given extensive attention and coverage of this research. . "Nature·Communication" journal reviewers believe that: "The above research results will ignite academic enthusiasm and interest in the application of quaternary system materials in the hypersonic field, because this represents a very promising material system."

Since 2002, with the support of the National 863, 973 and the National Natural Science Foundation, under the leadership of Professor Chang Xiang, a scholar from the Yangtze River, the team started with a medium-high temperature (<1600 °C) anti-oxidation coating of carbon/carbon composites. Look for a new ultra-high temperature ceramic coating material with excellent oxidation resistance and ablation resistance. In the course of the research, the material system screened from the initial silicon carbide to the subsequent strontium carbide, titanium carbide, zirconium carbide, zirconium boride, tantalum carbide and other dozens of systems and hundreds of high-temperature materials, almost involved All existing ultra-high temperature ceramics and high temperature composites. Up to now, the breakthrough in the development of new ablation-resistant ceramic coatings at 3000 °C ultra-high temperature environment has been achieved, which lasted for 15 years.

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