um 99.8 Methylidyneniobium
Niobium carbide
CAS: 12069-94-2
Molecular Formula: CHNb
um 99.8 Methylidyneniobium - Names and Identifiers
| Name | Niobium carbide |
| Synonyms | Niobium carbide NIOBIUM CARBIDE COLUMBIUM CARBIDE methylidyneniobium Niobium monocarbide Niobium(IV) carbide Niobium carbide (NbC) um 99.8 Methylidyneniobium NIOBIUM CARBIDE (AVERAGE PARTICLE SIZE 1 - 3UM) |
| CAS | 12069-94-2 |
| EINECS | 235-117-8 |
| InChI | InChI=1/CH.Nb/h1H;/rCHNb/c1-2/h1H |
um 99.8 Methylidyneniobium - Physico-chemical Properties
| Molecular Formula | CHNb |
| Molar Mass | 105.93 |
| Density | 7.6g/mLat 25°C(lit.) |
| Melting Point | 3500°C |
| Boling Point | 4300°C |
| Water Solubility | Insoluble in water. |
| Solubility | Soluble in acid, insoluble in a mixture of nitric acid and hydrofluoric acid, not in water |
| Appearance | Powder |
| Specific Gravity | 7.6 |
| Color | White |
| Storage Condition | Room Temprature |
| MDL | MFCD00016237 |
| Physical and Chemical Properties | Niobium carbide is a green cubic crystal with metallic luster and belongs to the cubic system of sodium chloride. The relative density is 8.47, the lattice constant is a = 0.447nm, and the melting point is 2300 ℃. The microhardness is> 235 Gpa(>2400/mm2), which is harder than corundum. The elastic modulus is 338000 N/mm2, the coefficient of thermal expansion is 6.65 × 10-6/K, and the thermal conductivity is 14w/(m? K), heat of formation -140.7 kJ/mol, specific heat capacity of 36.8 J/(mol? K), resistivity 35 μ Ω? cm. Insoluble in cold and hot hydrochloric acid, sulfuric acid, nitric acid, soluble in hot hydrofluoric acid and nitric acid mixed solution. It is stable at 1000-1100 °c and rapidly oxidizes to niobium pentoxide above 1100 °c. Niobium Carbide is fusible in titanium carbide, zirconium carbide, tungsten carbide and other compounds, and together to form a kind of homogeneous solid solution mixture. |
| Use | This product is for scientific research only and shall not be used for other purposes. |
um 99.8 Methylidyneniobium - Risk and Safety
| UN IDs | UN3178 |
| WGK Germany | 3 |
| TSCA | Yes |
| Hazard Class | 4.1 |
| Packing Group | III |
um 99.8 Methylidyneniobium - Nature
Open Data Verified Data
Green cubic crystal, metallic luster, belongs to the sodium chloride type cubic crystal system. Relative density 8. 47, lattice constant a = 0. 477nm, melting point 2300 ℃. The microhardness is> 235GPa (>2400kg/mmz), which is harder than corundum. Modulus of elasticity 3. 38 × 105N/mmz, coefficient of thermal expansion 6. 65 × IO -6 /K, thermal conductivity 14W/(m-K), heat of formation -140. 7kJ/mol. Specific heat capacity 36. 8J/(mol.K), resistivity 35u.cm. Insoluble in cold and hot hydrochloric acid, sulfuric acid, nitric acid; Soluble in hot hydrofluoric acid and nitric acid mixed solution. It is stable at 1000-1100 °c and rapidly oxidizes to niobium pentoxide above 1100 °c. Niobium Carbide is fusible in titanium carbide, zirconium carbide, tungsten carbide and other compounds, and together to form a kind of homogeneous solid solution mixture.
Last Update：2024-01-02 23:10:35
um 99.8 Methylidyneniobium - Preparation Method
Open Data Verified Data
generally, niobium pentoxide and carbon black are used as raw materials, and niobium pentoxide and carbon black are thoroughly mixed into a graphite crucible in a certain proportion, with the high-frequency electric furnace in the hydrogen or vacuum condition is heated to 1600~1800 deg C, once carbonized, and then add carbon black, fully mixed, further, it is heated to 1800 to 1900 ° C. Under hydrogen gas or vacuum, and secondary carbonization is performed to obtain niobium carbide. Alternatively, metal niobium and carbon black are used as raw materials, the metal niobium powder and carbon black are mixed in proportion, mixed well, and heated to 1600~1700 °c in vacuum or hydrogen, niobium Carbide is obtained by direct carbonization. The gas phase reaction method can also be used, that is, the mixture of niobium pentachloride vapor, hydrogen and methane is used as the raw material, and the mixture of niobium pentachloride vapor and hydrogen is used, through the tungsten wire whose temperature has reached more than 1000 ° C, a metal niobium layer is formed on the surface of the tungsten wire, and the temperature is increased to 1300 ° C by continuing to be energized, and then a mixed gas of methane and hydrogen is introduced, carbonized niobium into niobium carbide and deposited on the surface of the hot tungsten wire is the product.
Last Update：2022-01-01 09:05:53
um 99.8 Methylidyneniobium - Introduction
Super cemented carbide is made with tungsten carbide and tantalum carbide. Preparation or source: obtained by direct combination of niobium and carbon or reduction of niobium pentoxide with carbon.
Last Update：2022-10-16 17:12:42
um 99.8 Methylidyneniobium - Use
Open Data Verified Data
used as carbide cemented carbide additive. It is a ternary and Quaternary carbide solid solution component, which is used in combination with tungsten carbide and molybdenum carbide for hot forging dies, cutting tools, jet engine turbine blades, valves, tail skirt and rocket nozzle coatings. It can also be used as a purple artificial gemstone.
Last Update：2022-01-01 09:05:53
um 99.8 Methylidyneniobium - Reference Information
| crystal structure | Cubic, NaCl Structure |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| overview | niobium carbide, black cubic crystal or purple gray powder; Belongs to sodium chloride cubic crystal system; Insoluble in hot and cold hydrochloric acid, sulfuric acid, nitric acid, only soluble in hot mixed solution of hydrofluoric acid and nitric acid; It has high melting point (3500 ℃) and high hardness (microhardness> 235GPa, harder than corundum), good chemical stability (stable at 1000~1100 ℃, rapid oxidation to niobium pentoxide above 1100 ℃) and other characteristics; It is easy to melt in titanium carbide, zirconium carbide, tungsten carbide and other compounds to form homogeneous solid solutions, so it can be used to manufacture cermet, heat-resistant alloy and cemented carbide; it can be used as an additive to cemented carbide, the thermal hardness, thermal shock resistance, thermal compression resistance and oxidation resistance of cemented carbide are significantly improved. The cutting tools made of cemented carbide also have good thermal hardness, thermal shock resistance and thermal oxidation resistance. At the same time, the multiphase materials prepared by it have also been widely used in fusion reactors, machining, metallurgy, aerospace and other fields. (2015-09-09) |
| Preparation method | 1. Niobium pentoxide carbothermal reduction method Under the protection of high temperature, vacuum or inert gas, niobium pentoxide and carbon undergo carbonization reaction to form carbides. In industry, niobium pentoxide and carbon black are usually used as raw materials to prepare niobium carbide. First, niobium pentoxide and carbon black are prepared into a carbonized material in a proportion, so that they are fully mixed and then put into a graphite crucible, and put into a carbonization furnace in inert gas or Under vacuum conditions, heat to 1600~1800 ℃, perform the first carbonization, then add carbon black and fully mix, and then put it in a carbonization furnace to heat to 1800~1900 ℃ under inert gas or vacuum, carry out the second carbonization to obtain the niobium carbide product. The main reaction formula is as follows: Nb2O5 C = 2NbO2 CONbO2 3C = NbC 2CO The disadvantage of this method is that the niobium pentoxide powder and carbon black (or graphite) powder are mixed unevenly, and the activity of the carbon black (or graphite) powder is low, so that the reaction of niobium pentoxide is incomplete, and finally becomes the impurity of the product. In addition, the carbon black (or graphite) powder remaining in the niobium carbide powder has low activity, and a higher temperature (>600°C) is required for decarburization to make carbon generate carbon monoxide or carbon dioxide in an oxidizing atmosphere. The higher the temperature, the higher the oxygen content in the powder, the lower the quality of niobium carbide powder. 2. Metal niobium carbonization method This method uses niobium oxide (Nb2O5 or Nb2O3) to be reduced by hydrogen to obtain niobium powder or hydrogenated niobium powder, and carbon black in an equal molar ratio. After being fully mixed, it is heated to 1600~1700 ℃ under vacuum or inert gas protection to directly carbonize niobium carbide. The main reaction formula is as follows: 2NbC + C = Nb2CNb2C + C = 2NbC. The advantage of this method is high production efficiency, but the disadvantage is that the produced niobium carbide particles are coarse and the carbon content in the residue is high. 3. Chemical vapor reaction method This method uses niobium pentachloride vapor, hydrogen and methane mixed gas as raw materials to prepare niobium carbide. The mixed gas of niobium pentachloride vapor and nitrogen is electrically heated to form a metal niobium layer on the surface of the tungsten wire at a temperature of 1000°C or more, and then continue to energize to raise the temperature to 1300°C, and then pass in The mixed gas of methane and hydrogen carbonizes niobium into niobium carbide and deposits it on the surface of the hot tungsten wire to form a product. The main reaction formula is as follows: NbCl +5/2H2 = Nb + 5HClNb + CH4 = NbC +2H2 This method has the advantages of less powder agglomeration, good dispersibility and high production cost. 4. Auxiliary metal bath method This method uses cobalt as auxiliary metal, niobium and cobalt form a metal bath according to a mass ratio of 1: 2, put into a pure graphite crucible, heat to 1800 ℃ (completed within 1h) in a Taman furnace through argon flow, cool for 2-3h to room temperature, dissolve and remove cobalt with concentrated hydrochloric acid to obtain powdered NbC with a particle size of 100-200 μm, containing bound carbon 11.3% and free carbon 0.3%. NbC prepared by this method is the same as TaC, and the content of impurities, especially oxygen and nitrogen, is low (both lower than 0.01%). 5. Reaction ball milling The reaction ball milling method is to prepare niobium carbide products by chemical reaction between metal or alloy powder and other elemental substances or compounds during the ball milling process. The main equipment of the reactive ball milling method is a high-energy ball mill, which is mainly used to prepare ultra-fine crystal niobium carbide products. 6. Preparation method of ultra-fine niobium carbide (1) First, the carbide after one-time carbonization of niobium pentoxide is ball milled, sieved, etc., and then the second carbonization is carried out in vacuum, and the finished product is obtained after sampling and analysis. (2) The slurry niobium hydroxide is compressed and dried at 180~250 ℃ for 6~12h to remove water to obtain niobium hydroxide powder with a particle size of 20 ~ 90nm; Then it is evenly mixed with carbon black according to the mass ratio of 1:(0.225~0.235), carbonized in a vacuum furnace, controlled the carbonization temperature at 1280~1350 ℃ and continuously vacuumized; When the vacuum degree reaches 10~12Pa, the carbonization process is completed, cooling for 12~16h, discharge ball milling to obtain niobium carbide powder with Fischer particle size less than 0.8 μm. The following two reactions mainly occur in the vacuum carbonization process: 2Nb(OH)5 = Nb2O5 +5H2ONb2O5 + 7C = 2NbC +5CO2(3) mechanical alloying method: ultra-fine niobium carbide powder was successfully prepared using niobium powder and graphite as raw materials under the conditions of ball-to-material ratio of 30:1, ball milling speed of 300r /min and ball milling of 20h. 1.5% was added as a process control agent in the experiment, which shortened the synthesis time of niobium carbide by 10h. At the same time, the particle size of the powder obtained by ball milling with process control agent is more uniform. |
| application | 1. application in composite materials (1) composite ceramics are one of the raw materials of composite ceramic materials. the composite ceramic materials are often used in wear-resistant parts, cutting tools, electrodes and other fields due to their high hardness, high melting point, excellent chemical stability and electrical conductivity. (2) Cemented carbide can not only be used as an inhibitor of cemented carbide grain growth, but also form a third dispersed phase except WC and Co together with other carbides, which significantly improves the thermal hardness and resistance of cemented carbide. The ability of thermal shock, thermal compression resistance and oxidation resistance. Niobium carbide can be used to prepare hard alloy tool materials with excellent cutting performance due to its advantages of increasing the hardness of the alloy and improving the fracture toughness of the alloy. (3) The hard niobium carbide hard phase of the surfacing electrode enters the structure of the surfacing layer, so that the welding layer has a better wear-resistant skeleton and the wear resistance is greatly improved. The wear resistance of this welding rod surfacing wear alloy is 1.2-1.8 times higher than that of quenched 45# steel (HRC50) and 2.4-3.6 times higher than that of Fe-Cr-C-B type wear-resistant alloy. At the same time, the wear-resistant surfacing layer does not need to be preheated when welding, and can be surfacing on the surface of the workpiece. The small cracks generated on the surface can release the stress of the surfacing layer and will not diffuse into the base metal. d. The steel strengthening phase is added with a trace amount of niobium carbide in the steelmaking process to achieve the effects of precipitation strengthening and fine grain strengthening, thereby improving the comprehensive mechanical properties of the steel. (4) Aerospace components are used as preparation materials for many aerospace equipment components such as turbine rotors, gas rudders, blades, engine nozzle linings, and structural parts of nuclear reactors. 2. Application in coating materials (1) Niobium carbide as a metal carbide on the surface of die steel has high hardness, heat resistance and wear resistance. Therefore, coating it on steel shows that the wear resistance of the mold surface can be improved. (2) The metal workpiece coating is compounded with a niobium carbide layer on the surface of the metal workpiece substrate, which greatly improves the surface hardness, which can reach HV2800 or more. At the same time, the working temperature and microstructure density of the workpiece are increased, thereby prolonging its service life. Through chemical liquid deposition treatment, niobium carbide coating can be realized on the surface of cast iron piston rings, and the coating is firmly combined with the substrate; this coated piston ring not only has a good pocket-shaped oil storage structure, but also has the advantages of high hardness. It can significantly reduce the sliding friction coefficient when there is no lubricating medium and diesel oil lubrication, greatly improve its wear resistance, and at the same time reduce the friction loss of the diesel engine and improve the performance of the diesel engine. (3) Other niobium carbide-coated spacecraft high-temperature components are coated with niobium carbide, which can significantly increase their service life. In the electronics industry, the intermediate layer material of the electron emission tube adopts ultra-fine cobalt-containing niobium carbide, which has a significant effect on increasing the emissivity of the gate surface, reducing the gate temperature and reducing the gate thermal emission, thereby extending the electron emission tube Life. 3. Application in the production of metal niobium my country mainly uses indirect reduction method to produce metal niobium. First, the produced niobium carbide is used as a reducing agent to react with niobium pentoxide to generate crude metal niobium, and then refined to produce higher purity Metal niobium. In addition, niobium carbide can also directly reduce niobium pentoxide to produce pure metal niobium. |
| use | as a carbide cemented carbide additive, it is a ternary and quaternary carbide solid solution component, such as WC-NbC-C ternary system, etc. It can also be used as a purple artificial gem. Super cemented carbide is made with tungsten carbide and tantalum carbide. Preparation or source: obtained by direct combination of niobium and carbon or reduction of niobium pentoxide with carbon. |
| production method | niobium pentoxide reduction method industry usually uses niobium pentoxide and carbon black as raw materials to prepare niobium carbide: first, niobium pentoxide and carbon black are proportionally prepared into carbonized material, fully mixed, packed into graphite crucible, heated to 1600~1800 ℃ under hydrogen or vacuum conditions with high frequency electric furnace, carbonized for the first time, and then added carbon black, make it fully mixed, then heat to 1800~1900 ℃ under hydrogen or vacuum, and carry out the second carbonization to obtain niobium carbide. The direct method uses metal niobium and carbon black as raw materials to prepare niobium carbide: the metal niobium powder and carbon black are matched in proportion, and after full mixing, they are heated to 1600~1700 ℃ in vacuum or hydrogen to make them directly carbonized to prepare niobium carbide. The gas phase reaction method uses the mixture of niobium pentachloride vapor, hydrogen and methane as raw materials to prepare niobium carbide: the mixture of niobium pentachloride vapor and hydrogen is passed through an electrically heated tungsten wire with a temperature of 1000°C or more At this time, a metal niobium layer is formed on the surface of the tungsten wire, and then the electricity is continued to raise the temperature to 1300°C, and then a mixture of methane and hydrogen is introduced, carbonization of niobium into niobium carbide and deposition on the surface of the hot tungsten wire is a product. |
Last Update：2024-04-10 22:29:15
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Product Name: Niobium carbide Request for quotationCAS: 12069-94-2
Tel: 86+027-83389957
Email: 1024042217@qq.com
Mobile: 86+18627766980
QQ: 1024042217
Wechat: 18627766980
Spot supply
Product Name: niobium carbide Visit Supplier Webpage Request for quotationCAS: 12069-94-2
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
Wechat: 18301782025
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