Shaanxi BLOOM Tech Co., Ltd. is one of the most experienced manufacturers and suppliers of boron carbide (b4c) cas 12069-32-8 in China. Welcome to wholesale bulk high quality boron carbide (b4c) cas 12069-32-8 for sale here from our factory. Good service and reasonable price are available.
Boron carbide powder,typically represented by the chemical formula B₄C, is one of the hardest man-made materials known. Its hardness is second only to cubic boron nitride and diamond, with a Mohs hardness of approximately 9.3. This extraordinary hardness stems from its unique crystal structure - densely packed boron dodecahedrons are interconnected through strong covalent bonds with carbon atom chains, forming an extremely stable three-dimensional network. This structure not only endows it with extremely high hardness and excellent wear resistance, but also brings about low density (about 2.52 g/cm³), high melting point (about 2450°C), and extremely large thermal neutron capture cross-sections, among other outstanding characteristics. Therefore, boron carbide is widely used in military and industrial fields such as lightweight high-performance bulletproof armor, sandblasting machine nozzles, and wear-resistant seals. At the same time, it is also an indispensable neutron-absorbing material in nuclear power plants, used for manufacturing control rods and shielding components. However, this extremely strong covalent bond also results in poor sintering activity and inherent brittleness, making it a significant challenge to produce complex-shaped dense components, which remains an important research topic in current material science.
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C.F |
CB4 |
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E.M |
56 |
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M.W |
55 |
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m/z |
56 (100.0%), 55 (74.5%), 54 (37.0%), 55 (24.8%), 53 (6.1%), 57 (1.1%), 56 (1.1%) |
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E.A |
C, 21.74; B, 78.26 |
Detailed steps and chemical equations for preparing boron carbide powder
Step 1: Graphite and coal are crushed by carbon thermal reduction method. The purpose of this step is to break graphite and coal into smaller particles for subsequent mixing and reaction.
Step 2: Mix with boric acid in a ratio of 0.5:0.5:3. Mix the product of carbon thermal reduction of graphite and coal with boric acid in a ratio of 0.5:0.5:3 to obtain a uniform mixture.
C+H3BO3 → B+CO2+H2O
Step 3: Ball milling mixing. Put the mixture into a ball mill and mix thoroughly to make the various components more uniform.
Step 4: Carbonization reaction in electric arc furnace. Put the mixture into a single-phase bipolar horizontal arc furnace and conduct carbonization reaction at 1700-2300 ℃.
B2O3+3C → 2B+3CO
Step 5: Discharge and cooling. After the reaction is completed, remove the reaction products from the electric arc furnace and cool them down.
Step 6: Crush and select. Crush the cooled product and then select it to remove impurities and unqualified parts.
Step 7: Hot water washing. Wash the crushed and selected products with hot water to further remove impurities and residues.
Step 8: Coarse crushing and grinding. Roughly crush the product after the previous washing step, and then grind it to make the particle size of the product finer.
Step 9: Pickling. Wash the product with acid solution at a certain temperature, with a temperature not lower than 80 ℃ and a time of 12 hours. This step is to further remove impurities and residues, and improve the purity of the product. The possible acid washing chemical equation is: B+H3PO4 → H3BO3+H2.
Step 10: Wash with water until neutral. Wash the acid washed product with clean water until the pH value of the product reaches neutral.
Step 11: Selection and drying. Select the washed product, remove any non-conforming parts, and then dry the product.
Step 12: Screening and precipitation. Sieve and precipitate the dried product to obtain boron carbide products with different particle sizes.
Step 13: Series water washing. Wash the precipitated boron carbide product multiple times to further remove impurities and residues, and obtain high-purity boron carbide finished products.
Boron carbide powder, with the chemical formula B ₄ C and a molecular weight of 55.25, is usually a gray black or black micro powder with a metallic luster. Its Mohs hardness is about 9.3-9.5, second only to diamond and cubic boron nitride, ranking third in hardness among all common materials. The melting point of boron carbide is as high as 2350-2450 ° C, with a boiling point exceeding 3500 ° C, and it has excellent high temperature resistance. Its relative density is 2.508-2.512 g/cm ³, making it a lightweight material with high strength, high elastic modulus, and high thermal conductivity.
In terms of chemical stability, boron carbide exhibits extremely strong acid and alkali corrosion resistance, and is stable in all concentrated or dilute acid or alkali aqueous solutions, even resisting wetting by molten metal. In addition, boron carbide also has good neutron absorption ability, high capture cross-section for thermal neutrons, and does not form any radioactive isotopes. These unique properties have laid a solid foundation for the application of boron carbide in multiple fields.
Industrial sector
Ceramics and high-temperature durable components:
Boron carbide has extremely high hardness and strength, and can be used to manufacture components that operate at high temperatures, such as engine nozzles, turbine blades, ceramic connecting rods, etc. In the ceramic industry, adding boron carbide as a reinforcing phase to alumina and silicon carbide ceramics can significantly improve the fracture toughness and strength of the materials. Its excellent high-temperature stability enables these components to maintain stable performance under extreme conditions and extend their service life.
Cutting tools and abrasives:
Boron carbide has good wear resistance and cutting performance, and can be used to manufacture high hardness, high-strength cutting tools such as drill bits, milling cutters, cutting tools, etc. Meanwhile, the hardness of boron carbide is more than 10 times higher than that of steel, making it an ideal material for manufacturing high-efficiency abrasives such as grinding wheels, sand belts, and grinding rods. Its high grinding ability gives boron carbide abrasive a unique advantage in the processing of hard materials such as superhard alloys and gemstones.
Wear-resistant material:
The high hardness and wear resistance of boron carbide make it the preferred choice for manufacturing wear-resistant materials. Boron carbide wear-resistant materials are widely used in the manufacturing of wear-resistant parts in industries such as machinery, chemical engineering, metallurgy, etc., such as plungers of slurry pumps, mechanical seal rings, bearings, faucet blades, etc. These components can maintain stable performance in high-speed, high-pressure, and high wear environments, reducing equipment failures and maintenance costs.
Nuclear energy field
Boron carbide has a high ability to capture thermal neutrons and does not form any radioactive isotopes, making it an ideal neutron absorber in nuclear power plants. In nuclear reactors, boron carbide is mainly used to make control rods or shielding materials to control the rate of nuclear fission and shield neutron radiation. The control rods can be adjusted according to the operating status of the reactor to ensure the safety and stability of the nuclear reaction. Shielding materials can effectively reduce the radiation hazards of neutrons to the surrounding environment and personnel.
Military and Defense Fields
Bulletproof material:
Boron carbide has extremely high hardness and strength, making it an ideal choice for manufacturing bulletproof materials. In the military field, boron carbide is widely used in the manufacture of personal protective equipment such as bulletproof vests, bulletproof helmets, and bulletproof plates. Compared with traditional metal materials, boron carbide bulletproof materials have higher protective performance and lighter weight, which can effectively improve the mobility and survival ability of soldiers. Meanwhile, boron carbide is also used to manufacture protective materials for ballistic missiles to enhance their survivability.
Armored vehicles and ships:
The high hardness and wear resistance of boron carbide make it an ideal choice for manufacturing protective materials for armored vehicles and ships. In armored vehicles, boron carbide is used to manufacture armor plates for key parts such as the body and turret, in order to improve the protective performance of the vehicle. In ships, boron carbide is used to manufacture protective materials for decks, bulkheads, and other parts to resist enemy fire attacks. In addition, boron carbide is also used to manufacture ship coatings to improve the corrosion resistance and stealth performance of ships.
Aerospace field
Boroncarbide has excellent high-temperature stability and wear resistance, making it an ideal material for manufacturing high-temperature components of aerospace vehicles. In jet engines, boron carbide is used to manufacture key components such as nozzles and turbine blades to ensure stable operation of the engine in high temperature and high pressure environments. In aviation turbine engines, boron carbide is used to manufacture components such as blades and bearings to improve engine thrust and efficiency. In addition, boron carbide is also used to manufacture thermal protection systems for spacecraft to resist aerodynamic heating generated during high-speed flight.
Other fields
Chemical reactors and catalysts:
Boron carbide has excellent chemical stability and high-temperature stability, and can be used to manufacture chemical reactors and catalyst supports. In chemical production, boron carbide reactors can resist the erosion of various corrosive media, ensuring the safety and stability of the reaction process. Meanwhile, boron carbide as a catalyst carrier can improve the dispersion and stability of the catalyst, and enhance the efficiency of catalytic reactions.
Thermal barrier coating:
Boron carbide can be used to manufacture thermal barrier coating materials for use at high temperatures, such as coatings on the surface of turbine blades. Thermal barrier coatings can effectively reduce the operating temperature of high-temperature components, improve their lifespan and efficiency. Boron carbide powder thermal barrier coatings have excellent high temperature resistance and oxidation resistance, and can be used for a long time in a high-temperature oxidation atmosphere without degradation.
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