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Tantalum hafnium carbide is a refractory chemical compound ... and 4,232 K (3,959 °C; 7,158 °F), respectively, [1] and their "alloy" with a composition Ta 4 HfC 5 ...
Hafnium carbide (Hf C) is a chemical compound of hafnium and carbon.Previously the material was estimated to have a melting point of about 3,900 °C. [2] More recent tests have been able to conclusively prove that the substance has an even higher melting point of 3,958 °C exceeding those of tantalum carbide and tantalum hafnium carbide which were both previously estimated to be higher. [3]
The mixed carbide tantalum hafnium carbide (Ta 4 HfC 5) possesses the highest melting point of any currently known compound, 4,263 K (3,990 °C; 7,214 °F). [35] Recent supercomputer simulations suggest a hafnium alloy with a melting point of 4,400 K (4,127 °C; 7,460 °F). [36]
This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison. As of 2020, the most expensive non-synthetic element by both mass and volume is rhodium.
[6] [7] And only tantalum hafnium carbide was estimated to have a higher melting point of 3,942 °C (4,215 K; 7,128 °F). [8] However new tests have conclusively proven that TaC actually has a melting point of 3,768 °C and both tantalum hafnium carbide and hafnium carbide have higher melting points. [9]
The mixed carbide tantalum hafnium carbide (Ta 4 HfC 5) possesses the highest melting point of any currently known compound, 4,263 K (3,990 °C; 7,214 °F). [21] Recent supercomputer simulations suggest a hafnium alloy with a melting point of 4,400 K. [22] Hafnium forms both a hafnium(III) and a hafnium(IV) nitride.
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Binary compounds such as tungsten carbide or boron nitride can be very refractory. Hafnium carbide is the most refractory binary compound known, with a melting point of 3890 °C. [8] [9] The ternary compound tantalum hafnium carbide has one of the highest melting points of all known compounds (4215 °C). [10] [11]