Boron carbide, also known by the name black diamond, is a chemical formula that has the molecular formula B4C. This usually results in a greyish-black powder. It is one among the three hardest materials, along with diamond and cubicboron nuitride. This material can be found in armor for tanks, as well industrial applications. It has a Mohs toughness of 9.3.
An academician Huang Boyun of Central South University, has created a new type of ceramic coating which can withstand 3000 °C ablation. This was achieved through a number of extensive experiments. This could be a step towards the development hypersonic vehicles.
Professor Xiong Xiang of Central South University’s Institute of Powder Metallurgy explained that hypersonic means the aircraft travels at a speed of more than 5 times sound speed, or 6,120 kilometers per hour. With such a speed, the trip from Beijing to New York could be accomplished in 2 hours if the structural components of aircraft can withstand high levels of air friction or hot air impacts (up to 2000-3000°C) without being damaged. . Central South University recently developed ceramic coatings at ultra high temperatures and composite materials that provide protection for these components. Reports state that this is the first ever synthesis of single-phase, quaternary boroncontaining carbide, ultra-hightemperature ceramic material. The study of mixed material in binary compound system systems remains the dominant field of research in new materials. Because of this, the successful development of it will promote the widespread use of quaternary material systems in the hypersonic field.
Modified carbon/carbon carbon composite with ceramic coating is composed of an innovative single-phase, quaternary boron-containing carbide made from zirconium. By infiltrating carbon/carbon compounds with a multiceramic component, it is most commonly obtained. An ultra-high temperature composite combines both the adaptability to high temperatures of carbides and the antioxidation capabilities of borides. These properties make the ceramics superior for thermal shock resistance as well as ablation resistance. Apart from being resistant to the high temperature of 3000 °C the ceramic oxide also features a low oxygen diffusion rate and high-temperature Self-Healing Ability. Ceramics have a gradient structure which makes them less material than other ceramic systems. Ablation loss rate.
“This ultra-hightemperature ceramic blends the high temperature adaptability, carbides, and the anti-oxidation characteristics of Boride. The composites and coatings mentioned above are extremely resistant to heat shock, as well as superior ablation resistance. Xiong Xiang identifies the best candidates to make these parts.
Nature Communications published June 15th the research results and development of the team. The first thesis completion unit is located at Central South University’s State Key Laboratory of Powder Metallurgy. Zeng Yi (Professor Xiong Xiang) is the first author. Doctor Xiong Xiang was the first to publish. The University of Manchester, UK (partner unit) analyzed and described the material.
It was published and received much attention by academic circles abroad as well media. After publication, the number of downloaded articles exceeded 5,000 within the first 3 days. Other articles on that day were downloaded from anywhere from 300-900 times. The British Daily Mail, The Economist, the United States Yahoo,” Public Machinery,” Russia’s Satellite News Agency,” and other major media as well authoritative academic institutions worldwide have paid extensive attention to this research. . Nature Newsletter reviews that these research findings will inspire academic enthusiasm.
In 2002 the National 863/973 Foundation supported Professor Chang Xiang who is a Yangtze River Scholar. The team used a medium-high (1600 °C), anti-oxidation coated of carbon/carbon mixtures. Search for ultra-high temperatures ceramic coating materials that are both oxidation resistant and anti-lasing. The screening of material systems from initial silicon carbide to subsequent strontium, titanium, zirconium, zirconium, tantalum, tantalum, and others dozens of materials and hundreds high-temperature substances, nearly involved all existing ultra-high-temperature ceramics and composites. The 15-year-old breakthrough that led to the discovery of new ceramic coatings for ablation resistance at 3000°C was the most significant.
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