Search results
Results from the WOW.Com Content Network
Very few measurements of melting point in tantalum hafnium carbide have been reported, because of the obvious experimental difficulties at extreme temperatures. A 1965 study of the TaC-HfC solid solutions at temperatures 2,225–2,275 °C found a minimum in the vaporization rate and thus maximum in the thermal stability for Ta 4 HfC 5.
The melting points of tantalum carbides was previously estimated to be about 3,880 °C (4,150 K; 7,020 °F) depending on the purity and measurement conditions; this value is among the highest for binary compounds. [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]
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). [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.
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]
72 Hf hafnium; use (T/K) 2689 2954 ... 73 Ta tantalum; use (T/K) 3297 3597 ... The temperature at standard pressure should be equal to the normal boiling point, ...
72 Hf hafnium; use: 648 LNG: 571 WEL: 630 Zhang et al. 648 73 Ta tantalum; use: 732.8 LNG: 732.8 WEL: 735 Zhang et al. 753 74 W tungsten; use: 806.7 LNG: 806.7 WEL: 800 Zhang et al. 774 75 Re rhenium; use: 704 LNG: 704 WEL: 705 Zhang et al. 707 76 Os osmium; use: 678 LNG: 738 WEL: 630 Zhang et al. 678 77 Ir iridium; use: 564 LNG: 231.8 WEL: 560 ...
Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] Lauric acid: