New Record The Most Heat-resistant Materials Were Born - Tantalum Carbide and Hafnium Carbide Materials
What is Tantalum Carbide, Hafnium Carbide? Tantalum carbide is a light brown metal cubic crystal powder belonging to the sodium chloride type cubic system. At present, tantalum carbide is also used as a cemented carbide sintered grain growth inhibitor, which has a significant effect on suppressing grain growth, and has a density of 14.3 g/cm3. It is insoluble in water, hardly soluble in inorganic acids, soluble in mixed acids of hydrofluoric acid and nitric acid and decomposable. It has strong antioxidant capacity and is easily melted and decomposed by potassium pyrosulfate. It has high conductivity and a resistance of 30 O at room temperature, indicating superconducting properties.
Hafnium carbide is usually synthesized with cerium oxide (HfO 2 ) and carbon in an inert or reducing atmosphere. The reaction temperature of 1900 to 2300 deg C can form a solid solution with many compounds (such as ZrC, TaC, etc. ).
Tantalum Hafnium Carbide properties:
Researchers have recently developed two new heat-resistant materials, tantalum carbide (TaC) and tantalum carbide (HaC), which can withstand temperatures as high as nearly 4,000 degC.
It is worth mentioning that the research team from Imperial College London also found that the melting point of tantalum carbide has set a new record in the field of materials. Considering the extreme high temperature resistance of the two materials to nearly 4000 deg C, these two materials may be used in more extreme and extreme environments, such as the insulation shield of the next generation hypersonic spacecraft.
Both tantalum carbide and tantalum carbide are refractory ceramics, meaning that these two materials have excellent heat resistance. The ability of these two materials to withstand extreme environments means that their potential applications may include thermal protection systems for high-speed spacecraft and fuel cladding in nuclear reactors in an ultra-heat environment. However, since there are no technologies in the laboratory that can test the melting temperatures of two ceramics, TaC and HfC, it is still unclear whether they are really capable of working under extreme environmental conditions.
To this end, the researchers developed a new type of extreme heating technology that uses lasers to test the heat resistance of TaC and HfC. Using this technique, the researchers determined the melting point of both the TaC and HfC elements and the mixture. The study was recently published in the journal Scientific Reports.
They found that the measured melting point of the mixture of two ceramics (Ta0.8H2O20C) was consistent with the previous study, reaching 3905 deg C, but the melting points of the two compounds themselves were higher than previously found - the melting point of TaC reached 3768 deg C, while HfC is 3958 deg C.
The researchers said that the emergence of these two materials will pave the way for the development of the next generation of hypersonic aircraft. This means that future spacecraft can be much faster than ever.
The study was conducted by Dr. Omar Cedillos Barraza during his Ph.D. in Physics at Imperial College London. Dr. Sadiez Barazza is currently an associate professor at the University of Texas at El Paso.
Dr. Saidi Barazza said: "When the aircraft is flying at a supersonic speed of more than Mach 5, the friction between it and the air will produce a very high temperature. So far, both TaC and HfC have not been used. In the development of hypersonic vehicles. However, our new findings show that these two materials are more heat-resistant than we thought before, and in fact their heat resistance has surpassed any other compounds known to man. This fact means that they can be used in new spacecraft: in the atmosphere, these spacecraft can fly like ordinary airplanes and then fly in space at supersonic speeds. These two materials can make spacecraft Able to withstand the extreme heat generated between the shuttle atmosphere."
Examples of potential uses for TaC and HfC are the nose cover of the spacecraft and the edge of the external instrument that rubs the most with the outside during flight.
At present, more than 5 Mach spacecraft are not yet capable of manned flights. But Dr. Saidi Barazza pointed out that this dream is very likely to be realized in the future.
Dr. Saidi Barazza added: "Our tests show that these two materials have great potential when building future spacecraft. These two materials can withstand such extreme temperatures, which This means that one day, a manned hypersonic spacecraft is really possible. If we can fly at Mach 5, the flight time from London to Sydney will only take about 50 minutes, which will open up for the world. A new continent that breeds new business opportunities."
Tantalum hafnium carbide uses:
Tantalum carbide is used in powder metallurgy, cutting tools, fine ceramics, chemical vapor deposition, hard wear-resistant alloy tools, tools, molds and wear-resistant and corrosion-resistant structural component additives to improve the toughness of the alloy. The sintered body of tantalum carbide shows a golden yellow color and can be used as a watch ornament.
Hafnium carbide is very suitable for rocket nozzles and can be used as a nose cone for re-entry atmospheric rockets. It is used in ceramics and other industries.
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