About Hafnium Carbide HfC Powder:
Hafnium carbide HfC is a compound of carbon and hafnium. Hafnium carbide melting point is about 3900°C, one of the most refractory binary compounds known. However, its oxidation resistance is very low, and oxidation starts at temperatures as low as 430°C.
Hafnium carbide is a black, gray, brittle solid; high cross-section absorbs thermal neutrons; resistivity 8.8μohm·cm; the most refractory binary material known; hardness 2300kgf/mm2; used in nuclear reactor control rods. It is prepared by heating HfO2 with oil soot under H2 at 1900°C-2300°C. It is used as a crucible to melt oxide and other oxides.
An improved spark plasma sintering (SPS) device was used to synthesize ultrafine carbonized ha powder through the carbothermal reduction reaction of HfO2 at 1600°C. The synthetic powder has a fine particle size of about 125 nm and a low oxygen content of less than 0.5% by weight. Except for Zr, the powder purity is> 99.9%; when it contains Zr impurities, it is 99.6%. Due to the low synthesis temperature, rapid heating/cooling rate, and the current influence during the improved SPS process, intermediate reactions and particle growth are minimized. A new synthesis method can synthesize a relatively large amount of HfC powder (>175 g/day). After sintering the synthesized powder by SPS at 2300°C for 30 minutes under a pressure of 100 MPa, HfC ceramics with high relative density (>96%) were obtained.
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Performance of Hafnium Carbide HfC Powder :
Hafnium Carbide Powder, a gray metallic solid, has the highest melting point of a single compound and is a good material for the lining of high melting point metal smelting; it has a high melting point, high hardness, good high-temperature strength, and corrosion resistance. Excellent characteristics, such as better and lower thermal conductivity, can be used as an additive for cemented carbide, widely used in the field of cutting tools and molds; also suitable for rocket nozzle materials, can be used in the nose cone of rockets, often used in the aerospace field, It can also be used in nozzles, high-temperature linings, arcs or electrodes for electrolysis; it can also be used in nuclear reactor control rods.
| Hafnium Carbide Powder Chemical Composition (%) | |||
| me | HfC | Total C | Free.C |
| HfC Powder | 99min | 6.3min | 0.1max |
How is Hafnium Carbide HfC Powder produced?
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 reacting hafnium tetrachloride with methane at 2100°C. A sufficient amount of hafnium oxide or metal sponge can be obtained in the large-scale production of pure zirconium for nuclear reactors. 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% 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 a hydrofluoric acid solution. Carbonization reacts exotherm with halogen at 250-500°C to form hafnium tetrahalide and hafnium oxide with oxygen above 500°C. In the presence of hydrogen, hafnium carbide will slowly lose some carbon at higher temperatures.
Hafnium Carbide Uses:
Hafnium carbide (HfC) has the highest melting point of any known binary alloy and has many high-temperature applications. It is 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 is 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.
Hafnium Carbide Properties |
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| Other Names | hafnium(IV) carbide, hafnium monocarbide, HfC powder |
| CAS No. | 12069-85-1 |
| Compound Formula | HfC |
| Molecular Weight | 190.5 |
| Appearance | Black Powder |
| Melting Point | 3900 °C |
| Boiling Point | N/A |
| Density | 12.20 g/cm3 |
| Solubility in H2O | N/A |
| Exact Mass | 191.946549 |
Hafnium Carbide Health & Safety Information |
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| Signal Word | N/A |
| Hazard Statements | N/A |
| Hazard Codes | N/A |
| Risk Codes | N/A |
| Safety Statements | N/A |
| Transport Information | N/A |
