methylidynetantalum
Tantalum carbide
CAS: 12070-06-3
Molecular Formula: CTa
methylidynetantalum - Names and Identifiers
| Name | Tantalum carbide |
| Synonyms | Tantalum carbide TANTALUM CARBIDE TantaluM(IV) carb methylidynetantalum tantalumcarbide(tac) Tantalum monocarbide Tantalum carbide pwdr. Tantalum carbide powder (TaC) Tantalum carbide (metals basis) Tantalumcarbidemeshpowderavgemicronsorless |
| CAS | 12070-06-3 |
| EINECS | 235-118-3 |
| InChI | InChI=1/CH.Ta/h1H;/rCHTa/c1-2/h1H |
methylidynetantalum - Physico-chemical Properties
| Molecular Formula | CTa |
| Molar Mass | 192.96 |
| Density | 13.9 |
| Melting Point | 3880°C |
| Boling Point | 5500°C |
| Water Solubility | Soluble in hydrofluoric acid and nitric acid. Partially soluble in water. |
| Appearance | Brown powder |
| Color | Gray to black |
| Storage Condition | Room Temprature |
| MDL | MFCD00011255 |
| Physical and Chemical Properties | Tantalum carbide is a light brown metal-like cubic crystalline powder, belonging to the sodium chloride type cubic crystal system. Carbon content of 6.23% (mass), relative density of 13.9, melting point of 3880 deg C, boiling point of 4780 deg C, lattice constant a = 0.4454 nm, Mo hardness 9~10, thermal conductivity of 22w/(m? K), the coefficient of thermal expansion of 6.29 x 10-6/K. Insoluble in water, insoluble in inorganic acid, soluble in hydrofluoric acid and nitric acid mixed acid and decomposition. Strong antioxidant capacity, easy to be potassium pyrosulfate melting and decomposition. The conductivity was large, and the resistance at room temperature was 30 Ω, showing superconducting properties. |
| Use | It is matched with tungsten carbide and niobium carbide to make super cemented carbide. |
methylidynetantalum - Risk and Safety
| UN IDs | UN3178 |
| WGK Germany | 3 |
| TSCA | Yes |
| Hazard Class | 4.1 |
| Packing Group | III |
methylidynetantalum - Nature
Open Data Verified Data
tantalum carbide is a light brown metallic cubic crystalline powder. Cubic crystal system, lattice constant a = 0.4454nm. Relative density 13.9; Melting point 3880 ° C; Boiling point 4780 ° C. The Mohs hardness is 9-10, the thermal conductivity is 22W/(m · K), and the coefficient of thermal expansion is 6. 29 × 10-6.K-1. Resistant to high temperatures below 3800 ℃, its hardness can be comparable with Diamond. Insoluble in water, insoluble in inorganic acid, soluble in hydrofluoric acid and nitric acid mixed acid and decomposition. Strong antioxidant capacity, easy to be potassium pyrosulfate melting and decomposition. Good conductivity, with superconducting properties.
Last Update：2024-01-02 23:10:35
methylidynetantalum - Preparation Method
Open Data Verified Data
tantalum pentoxide and carbon black were used as raw materials. Tantalum pentoxide and carbon black were thoroughly mixed in a reduction furnace, and reduced by heating at 1500 ° C. Under hydrogen or vacuum to obtain tantalum carbide powder. Alternatively, a primary reduction is carried out by heating to 1900 ° C. In an inert gas, and then a secondary carbonization is carried out under vacuum to obtain tantalum carbide. Tantalum pentoxide can also be reduced with aluminum in a graphite crucible. When the temperature is heated to 2000 ° C., pure graphite blocks are added to generate excess aluminum carbide, which is then removed by cooling, and then the reactants are crushed, impurities were removed by inorganic acid, and high purity tantalum carbide crystals were obtained. Tantalum carbide with coarser particles can also be produced by direct carbonization of tantalum metal and carbon black.
Last Update：2022-01-01 09:05:44
methylidynetantalum - Introduction
Extremely hard. There is tantalum pentoxide made by carbon reduction. Except at high temperatures, chemical resistance is excellent.
Last Update：2022-10-16 17:12:43
methylidynetantalum - Use
Open Data Verified Data
can be used as cutting tools, fine ceramics, chemical vapor deposition, hard wear alloy additives, improve the toughness of the alloy. The sintered body of tantalum carbide is golden yellow and can be used as decoration.
Last Update：2022-01-01 09:05:45
methylidynetantalum - Reference Information
| crystal structure | Cubic, NaCl Structure |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Overview | Tantalum carbide, a transition metal carbide; black or dark brown metallic powder, cubic crystal system, hard, insoluble in water, slightly soluble in sulfuric acid and hydrofluoric acid, soluble in a mixed solution of hydrofluoric acid and nitric acid; extremely stable chemical properties; excellent physical and chemical properties, such as high hardness, high melting point, good electrical conductivity and thermal shock resistance, good chemical corrosion resistance, high oxidation resistance and certain catalytic performance, etc.; it has a wide range of applications in industry and military. In cemented carbide, it is widely used as an additive. Its main function is to improve the high temperature strength of cemented carbide and inhibit the growth of tungsten carbide particles; in cutting tools, as a hard coating to increase the chemical corrosion resistance and wear resistance of the base metal; in the military, it can be used as a coating for jet engine turbine blades and rocket nozzles, which can significantly improve its ablation resistance and extend its service life; At the same time, it can also be used for electrode materials, using wire electric discharge to cut into complex shapes; and as a second-phase particle reinforced metal matrix composite material, used in aerospace, metallurgy, building materials, electric power, hydropower, mining and other fields. |
| Preparation method | 1. In the industry, tantalum pentoxide is mixed with solid carbon by ball milling, and a non-oxidizing atmosphere (mainly vacuum and argon atmosphere) is used. At a high temperature of 1700°C, the reduction and carburizing treatment are carried out to prepare tantalum carbide powder with a particle size greater than 2 μm. 2. Nano-tantalum carbide powder was prepared by heat treatment in non-oxidizing atmosphere by liquid phase pre-body method. Add 5mL of anhydrous ethanol into a small beaker filled with 0.50gTaCl5, stir evenly with a glass rod, then put it into an ultrasonic cleaner, heating temperature 55 ℃, working frequency 40kHz, ultrasonic power 80W, ultrasonic oscillation for 5-10 min, add 0.10g of nano-activated carbon, continue oscillation for 15-20min, pour it into a crucible, coat it evenly on the inner wall, and blow dry with a hot air blower. The crucible containing the sample is placed in a vacuum hot pressing furnace, and the high temperature treatment is carried out at 1300 ℃ in a vacuum degree of 100Pa or hydrogen atmosphere, or the high temperature treatment is carried out at 1400 ℃ in an argon atmosphere, the holding time is 0.5h, and the heating rate is 20 ℃/min. When the experiment is over, brush the product in the crucible with a brush. 3. Heat in air to convert to tantalum pentoxide. Can be melted with potassium pyrosulfate. It is prepared by reacting metal tantalum with carbon or tantalum pentoxide with smoke black in an inert atmosphere to 1900 ℃. 4. Tantalum pentachloride and methane are used as reaction gases, argon is used as a carrier, silicon carbide resistors are heated from external radiation, carbonized or tantalum pentoxide is mixed with carbon black, pressurized powder molding, and heated in hydrogen or vacuum. |
| function and application | 1. in cemented carbide, it is widely used as an additive. its main function is to improve the high temperature strength of cemented carbide and inhibit the growth of tungsten carbide particles. 2. In cutting tools, it is used as a hard coating to increase the chemical resistance and wear resistance of the base metal. 3. In the military, it can be used as a coating for jet engine turbine blades and rocket nozzles, which can significantly improve its ablation resistance and prolong its service life. 4. Because of its good conductivity. Therefore, it can be used for electrode materials, and it can also be cut into complex shapes using wire electric discharge. 5. As the second phase particle reinforced metal matrix composite material, it has been widely used in aerospace, metallurgy, building materials, electric power, hydropower, mining and other fields. |
| use | used in powder metallurgy, cutting tools, fine ceramics, chemical vapor deposition, hard wear alloy additives to improve the toughness of the alloy. The sintered body of tantalum carbide shows golden yellow color and can be used as a watch ornament. It is matched with tungsten carbide and niobium carbide to make super cemented carbide. |
| production method | tantalum oxide carbonization method uses tantalum pentoxide and carbon black as raw materials to prepare tantalum carbide: 1 rnol tantalum pentoxide and 7 mol of carbon black are fully mixed, put into a reduction furnace, and heat and reduce for lh at l500 ℃ in hydrogen or vacuum to prepare tantalum carbide powder. Or it can be reduced by heating to 1900 ℃ in inert gas. In order to improve product quality, primary carbides are first carbonized in inert gas, and then tantalum carbide is prepared by secondary carbonization under vacuum conditions. |
Last Update：2024-04-10 22:29:15
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