B4C HD 07
Boron carbide
CAS: 12069-32-8
Molecular Formula: CB4
B4C HD 07 - Names and Identifiers
| Name | Boron carbide |
| Synonyms | B4-C Tetrabor B4C HD 07 Boron carbide boroncarbide(b4c) tetraboron carbide Boron carbide (B4C) |
| CAS | 12069-32-8 |
| EINECS | 235-111-5 |
| InChI | InChI=1/CB4/c2-1-3(2)5(1)4(1)2 |
| InChIKey | NOJMLSPGQSYAIT-UHFFFAOYSA-N |
B4C HD 07 - Physico-chemical Properties
| Molecular Formula | CB4 |
| Molar Mass | 55.25 |
| Density | 2.51 g/mL at 25 °C (lit.) |
| Melting Point | 2450°C |
| Boling Point | 3500°C |
| Water Solubility | Insoluble in water. |
| Appearance | Black lens |
| Specific Gravity | 2.51 |
| Color | Black |
| Merck | 14,1344 |
| Storage Condition | Room Temprature |
| Stability | Stable. Incompatible with oxidizing agents. Not flammable. |
| Sensitive | Easily absorbing moisture |
| MDL | MFCD00011520 |
| Physical and Chemical Properties | Character gray-black powder. melting point 2350 ℃ boiling point> 3500 ℃ relative density 2.52 |
| Use | The powder is used as an abrasive material, the molded product can be used as an anti-wear material, and is also used in atomic nuclear reactors |
B4C HD 07 - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | 20 - Harmful by inhalation |
| Safety Description | S22 - Do not breathe dust. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S38 - In case of insufficient ventilation, wear suitable respiratory equipment. |
| WGK Germany | 3 |
| RTECS | ED7420000 |
| TSCA | Yes |
| HS Code | 28499010 |
B4C HD 07 - Nature
Open Data Verified Data
boron carbide is a compound having a high hardness, an appearance of a gray-black powder, a relative density of 2. 52, a melting point of 2450 ° C., a boiling point of> 3500 ° C., and a hardness (Mohs) of 9. 36. Boron carbide is chemically stable in all concentrated or dilute aqueous acid or base solutions. However, it can be decomposed by a mixed acid of sulfuric acid and hydrofluoric acid and a mixed acid of hydrofluoric acid, sulfuric acid and nitric acid. After treatment with a mixture of sulfuric acid and hydrofluoric acid, boron trioxide can be completely decomposed and formed by calcination at 800 ℃ for 21h in air. Untreated was stable. Carbon dioxide and boron trioxide are formed by slow oxidation when heated to 1000 °c in oxygen. In the presence of nitric acid with sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate melting, boron carbide easy decomposition and solution. When some transition metals and their carbides coexist, there is a special instability. Under the condition of 1000~1100 ℃, the transition metals of groups IV, V and VI in the periodic table react strongly with boron carbide powder to form metal boride.
Last Update：2024-01-02 23:10:35
B4C HD 07 - Preparation Method
Open Data Verified Data
carbothermal reduction method: After graphite and coal are pulverized, they are mixed with boric acid in a ball mill according to the ratio of 0.5:0.5:3, and then placed in a single-phase bipolar horizontal electric arc furnace, the carbonization reaction was carried out at 17-2300 °c. After the completion of the reaction, discharge, cooling, crushing, selection, hot water washing, then by coarse grinding, grinding, acid washing (temperature not lower than 80 ℃,12h), after washing with water to neutral, then using sedimentation and tandem water washing method for separation, drying, screening, prepared boron carbide products. Boron carbide ceramics can be prepared by molding and hot pressing sintering using the above boron carbide raw materials.
Last Update：2022-01-01 10:58:27
B4C HD 07 - Introduction
The hardness is lower than that of industrial diamond, but higher than that of silicon carbide. It is less fragile than most pottery. Has a large thermal neutron capture cross section. Strong anti-chemical effect. It is not eroded by hot hydrogen fluoride and nitric acid. Soluble in molten alkali, insoluble in water and acid.
Last Update：2022-10-16 17:12:41
B4C HD 07 - Use
Open Data Verified Data
grinding and polishing of super hard metal and high carbon steel; Repair of wire drawing die, extrusion die, wire guide plate, grinding tool shaping, chisel, etc.; Repair of gauge, tip, reamer and milling cutter; processing of hard ceramics, grinding, grinding of valves, gears, rolling bearings; Processing and grinding of gem; Processing and grinding of mineral tests; Ultrasonic processing of various materials, manual tools, raw materials for grinding wheel repair; Shielding materials for atomic reactors, metal additives, special electrode materials, metal ceramic raw materials, boride synthetic raw materials, ceramic additive materials.
Last Update：2022-01-01 10:58:26
B4C HD 07 - Safety
Open Data Verified Data
packaging and storage, with polyethylene plastic box packaging. Each box has a net weight of 0.5kg or 1kg. Should be stored in a clean and dry warehouse.
Last Update：2022-01-01 10:58:28
B4C HD 07 - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| boron carbide ceramics | boron carbide ceramics are a class of ceramics with boron carbide as the main chemical composition. The chemical formula of boron carbide is B4C, which belongs to the hexagonal rhombus system. There are 12 boron atoms in the unit cell, and the lattice parameters co = 1.212nm,ao = 0.56nm. There are atoms with a diameter of 0.18nm in the crystal structure, so lithium or helium atoms can be retained in the crystal structure. Boron carbide powder is mainly synthesized by carbothermal reduction method. In addition to direct reduction with boron anhydride, boron anhydride can also be prepared by reducing with Mg in the presence of carbon (C). The reaction formula is: 2B2O3 6Mg C → B4C 6MgO, and the reaction temperature is 1000~1200 ℃. This reaction is a strong exothermic reaction. The final product needs to be pickled with H2SO4 or HCl, and then washed with hot water to obtain a relatively pure boron carbide powder with fine particle size (0.1~5 μm) and no C. Boron carbide ceramics are mainly sintered by hot pressing, and hot isostatic pressing and pressureless sintering can also be used. The temperature of hot pressing sintering is 2000~2100 ℃. Generally, metals such as Mg, Al, Cr, Si, Ti or oxides such as Al2O3 and MgO or glass are added as sintering aids. The melting point of boron carbide is 2450 ℃, the theoretical density is 2.519g/cm3, the elastic modulus is 360 ~ 460GPa, the thermal expansion coefficient is 5.73 × 10-6/K (300~1970K), the thermal conductivity at 200 ℃ is 24W/(m-K), the microhardness is 4950kg/mm2, which is only lower than that of diamond and cubic boron nitride, and has a large thermal neutron capture cross section. It can be used to process gems, ceramics, molds, turning tools and bearings. It can also be used as a sandblasting nozzle, bulletproof material and neutron absorber for atomic reactors. |
| use | powder is used as grinding material, molded product can be used as anti-wear material, also used in atomic nuclear reactor used for grinding, grinding, drilling and polishing of hard materials such as hard alloy and gem, manufacturing of metal boride, smelting boron steel, alloy boron and special welding, etc. Manufacture of anti-chemical Lu pottery and wear-resistant tools. |
| production method | after graphite and coal are crushed by carbothermal reduction method, they are fully mixed with boric acid according to the batching ratio of 0.5:0.5:3 in a ball mill, then placed in a single-phase bipolar horizontal electric arc furnace for carbonization reaction at 1700~2300 ℃. After the reaction is completed, discharge, cooling, crushing, selection, hot water washing, then coarse crushing, grinding, pickling (temperature not lower than 80 ℃,12h), wash with water to neutral, and then use sedimentation and series water washing method to select, dry and screen to produce boron carbide finished products. Its 4H3BO3 7C → B4C 6CO ↑ 6H2O |
Last Update：2024-04-10 22:29:15
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