Newly 3000°C Ablative Ceramic Coating Successfully Developed - Multi-boron-containing Single-phase Carbide
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Boron carbide is also known as black Diamond. It has a molecular formula of B4C. The powder is typically grayish. It is one the three hardest materials known (the other two being diamond and cubic boronnitride), which are used in many industrial applications, including tank armor, torso armor, and body armor. It has a Mohs toughness of 9.3. A large number of tests were conducted by the team of the Academician Huang Boyun of Central South University’s National Laboratory of Powder Metallurgy to develop a new ceramic coating and composite materials that are resistant to 3000°C ablation. This discovery may pave a way for the development hypersonic cars.
According to Professor Xiong Xiang of the Institute of Powder Metallurgy of Central South University's Institute of Powder Metallurgy (IPM), hypersonic flight is defined as a flight speed that is at least 6120 km/h, or 5 times faster than the sound. With such high speeds, the flight between Beijing and New York could be completed in just 2 hours - provided the aircraft's key structural components can handle severe air friction as well as hot air impacts of 2000-3000 deg. C. . Central South University has developed ceramic composite materials and coatings for ultra-high temperatures that provide better protection of the above components. The world's very first synthesis of a single-phase quaternary carbide ultra-high-temperature ceramic material with boron is being reported. This coating is a perfect "fusion" between carbon-carbon-based materials. The current focus of research in the area of new materials is on the mixed materials of binary compound system. The successful application of materials quaternary to hypersonic will be greatly facilitated by its development.
The novel ceramic coated modified carbon/carbon material is composed by a single-phase carbide of zirconium (quarterary), titanium, carbon, and boron. It has a stable carbide-crystal structure. Infiltration of a multiceramic phase is the main method for obtaining it. The ultra high temperature ceramic combines the high-temperature adaptability of carbides and the anti-oxidation property of borides. This makes the coatings, composites, and other materials exhibit superior ablation and thermal shock resistance. The ceramic oxide can withstand an ultra-high temperature of 3000 degC and has low oxygen diffusion rates, self-healing properties at high temperatures, dense and gradient ceramic coatings, all of which make the ceramic a lighter material. Ablation loss rate.
The above composites and coatings are superior in ablation resistance as they combine the carbide with the antioxidation properties of the boride. This combination is essential for hypersonic cars. The promising candidates," said Xiong Xiang.
Nature Communications published on 15th June the results of research conducted by the team. The State Key Laboratory of Powder Metallurgy of Central South University was the first completion unit of this thesis. Zeng Yi and Professor Xiong Xiang are the first correspondents. First author is the doctor. The University of Manchester (UK), a partner unit of the University of Manchester, UK characterized the material and performed an analysis.
After publication, the article attracted a great deal of interest from the foreign media and academic circles. In the three days immediately following publication, this article was downloaded over 5,000-times, whereas other articles were only downloaded 300 to 900 times. The Daily Mail in Britain, The Economist in the United States and Public Machinery (Russia) have all covered the research. . According to the reviewer in Nature Newsletter: "The above results will ignite academic excitement and interest in applying quaternary materials in the field of hypersonics, because it represents a very promising system of material."
The team has been working on anti-oxidation coatings for carbon/carbon composites since 2002. This was done with the help of the National 863 and 973, as well as the National Natural Science Foundation. Professor Chang Xiang is the leader of this project. Find a new ultra high temperature ceramic coating that has excellent oxidation resistance, and resistance to ablation. In the course the research, dozens and hundreds of high-temperature material systems were screened, from the initial strontium carbide through to zirconium and zirconium boride. tantalum and tantalum carbide. It has taken 15 years to achieve the breakthrough of developing new ablation-resistant coatings in 3000 degC ultra high temperature environment.
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