The single compound with the highest melting point on Earth is hafnium carbide
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Author : TRUNNANO
Update time : 2021-03-15 10:44:15
Hafnium carbide (HfC) is a chemical compound of hafnium and carbon. With a melting point of about 3900 °C, it is one of the most refractory binary compounds known. However, it has low oxidation resistance, with the oxidation starting at temperatures as low as 430 °C. This compound may be seen on future spacecraft as part of the heat shield.
Is hafnium carbide toxic? Hafnium oxychloride has been found to be toxic via the intraperitoneal route in animal studies. No industrial poisonings involving hafnium have been reported. Carbides: Pure carbon has extremely low toxicity to humans and can be handled and even ingested safely in the form of graphite or charcoal.
What is Hafnium Carbide HfC powder made from? Hafnium carbide powder is prepared by reducing hafnium oxide with carbon at 1800 to 2000°C, in which a longer treatment time is required to remove all oxygen. Hafnium carbide is a dark gray brittle solid. It can be prepared by heating a mixture of elements or by reacting hafnium tetrachloride with methane at 2100°C. In the large-scale production of pure zirconium for nuclear reactors, a sufficient amount of hafnium oxide or metal sponge can be obtained. On an industrial scale, hafnium carbide can be made from hafnium hydride sponge at 1500–1700°C or from oxidized ha at 2000–2200°C by vacuum carburizing in the presence of hydrogen. The resulting carbide contains almost the theoretical amount of carbon (6.30%°C) and up to 0.1% of free carbon (219). The obtained hafnium carbide is not a true stoichiometric compound, but only a carbon solution at a specific interstitial position of the face-centered cubic lattice. Carbonization is inert to most reagents at room temperature but will be dissolved by hydrofluoric acid solution. Carbonization reacts exotherm with halogen at 250-500°C to form hafnium tetrahalide and forms hafnium oxide with oxygen above 500°C. In the presence of hydrogen, hafnium carbide will slowly lose some carbon at higher temperatures.
Application of Titanium Carbide TiC Powder Hafnium carbide (HfC) has the highest melting point of any known binary alloy and therefore has many high-temperature applications. It is considered a candidate for extremely high-temperature applications, such as rocket nozzles and scramjet components. Carbonization can also be used in hard coatings, usually applied by processes such as plasma spraying. In addition, HfC structural foam can be made into high-temperature components or used as thermal insulation materials.
Hafnium carbide (HfC) whose melting point exceeds 3890°C is a refractory binary compound. HfC and NBC can also be used as refractory coatings in nuclear reactors. The mixed carbide Ta4HfC5 has the highest melting point at 4215°C.
1. Hafnium carbide can be used as an additive for cemented carbide, widely used in the field of cutting tools and molds; 2. Hafnium carbide applicable to the rocket nozzle material, can be used in the nose cone of the rocket, applied in the aerospace field, and can also be applied to the nozzle, high-temperature lining, arc, or electrode for electrolysis; 3. Hafnium carbide used in nuclear reactor control rods. It is an ideal metal for making nuclear reactor control rods; 4.Used to prepare ultra-high temperature ceramics; 5.Reactant for synthesizing hafnium-containing organometallic polymer; 6.For coating.
The substance with the highest melting point on Earth The single compound with the highest melting point on Earth is hafnium carbide, which has a melting point of 3890 degrees Celsius. At present, the highest melting point known on earth is the hafnium compound, tetratantalum hafnium pentacarbide, melting point 4215℃. Hafnium, having an atomic number of 72, is a shiny silvery-gray transition metal. It is found in the earth's crust at an amount of 0.00045% and is often associated with zirconium in nature, where there are six naturally stable isotopes. It is precise because of the high temperature and corrosion resistance of hafnium alloy, so often used as a rocket and aircraft forward protection layer.
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