Ultra-high temperature materials

by Izzy X. Product specialist

What are ultra-high temperature materials Ultra-high-temperature materials refer to the most heat-resistant high-grade materials that can be used as usual under severe environments such as stress an

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Refractory metals (W, Mo, Ta, Nb, Zr, etc.) and their alloys have outstanding advantages such as high melting point, high temperature resistance and strong corrosion resistance.
Ultra-high temperature ceramic materials, especially the borides and carbides of the insoluble metals Zr, Hf, and Ta, represent candidate materials that can be used above 2000C.
The melting points of hafnium carbide (HfC), zirconium carbide (ZrC) and tantalum carbide (TaC) are much higher than their oxides.
Research shows that the brittleness and room temperature strength of ZrB2 and HfB2 based ceramic composites can be overcome by reasonable selection of the composition, purity and particle size of the
C/C composite material has light weight, high specific strength, high specific stiffness, high modulus, low thermal expansion coefficient, high strength at high temperature, good ablation performance

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Review on Ultra-high temperature materials

From room temperature to 2 000 , the strength of C/C composite material increases with the increase of temperature, and it still has higher strength at 2500 . Compared with many metal alloys and ceramic matrix composites, C/C composites have the highest specific strength, but their applications as high-temperature structural materials are extremely limited. This is because in an oxidizing environment, especially over 350, its use effect Very bad, it will burn above 500C. Therefore, the development of a reliable oxidation protection system is critical to the full potential of C/C composites. To this end, many research institutions have conducted in-depth research on this issue, such as by adding SiO2, ZrO2, Al203, etc. to the substrate and improving the surface coating to study the impact of oxidation resistance. The United States, Russia, France and other countries have proposed to use refractory carbide coatings in recent years to improve the oxidation resistance of carbon-carbon composites, reduce the ablation rate, and withstand higher gas temperatures or longer working hours. The molten carbides include SiC, HfC, TaC, NbC, ZrC and so on.

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