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Boron carburide is a high-performance carbon compound, which is composed primarily of boron, carbon, and other elements. The chemical formula for B4C is B4C. It is widely used by industries, the military, aerospace and other fields because of its characteristics, such as high melting point and high heat transmission. This article will give a detailed description of the physical properties and chemical composition, as well as preparation methods, performance characteristics, and applications fields, for use in research and other fields.
Boron carbide, a non-metallic inorganic material, has a mass density of 2.52g/cm3. It has a cubic lattice structure, a black lustre, and a density of 2.52g/cm3. Boron carbide exhibits a low electrical conductivity of only 10-6S/m, and has excellent insulation. Its thermal conductivity (97W/m*K) is lower than metals, silicon and ceramics but higher than glass and other materials.
Boron carbide exhibits chemical stability, and it is not reactive to acids and alkalis. B4C is reactive with O2, H2O and other substances. High temperatures can generate B2O3, CO etc. B4C has anti-oxidant and corrosion resistance. This makes it a good choice for long-term usage in corrosive and high-temperature environments.
Preparation methods for
The main methods are the arc melting and chemical vapour deposit method.
Methode de réduction du carbothermal
The carbon thermal method is widely used to prepare
. This method generates carbon dioxide and boron carburide by melting boric black and carbon. The reaction formula is B2O3+3C + B4C+CO. Reaction temperature is usually between 1500 and 1700°C. The method has the advantage of being simple, low-cost, and easy to use. However, the boron carbide produced is not of high purity.
Arc melting method
In the arc melting process, graphite electrodes are heated and melted in an arc with boric acid to create boron carbide. The reaction formula is B2O3+3C + B4C. The reaction temperature ranges between 1800 and 2000°C. This method yields boron-carbide with high purity, fine particle size and a complex and expensive process.
Chemical vapour deposition method
Chemical vapour deposition uses the reaction of gaseous carbon black and borane at high temperature to create boron carburide. The reaction formula is B2H6+6C B4C+6H2. The reaction temperature ranges between 1000-1200°C. The boron-carbide prepared using this method is high in purity, with superfine particles. However, the process is complicated and expensive.
The performance characterisation of
The term primarily includes chemical, physical and mechanical characteristics.
Density, conductivity and thermal conductivity are the main physical properties of Boron carbide. The density is 2.52g/cm3, conductivity 10-6S/m, and thermal conductivity 97W/m*K.
Boron carbide exhibits chemical stability, and it is not reactive to acids and alkalis. B4C is reactive with H2O and O2. High temperatures can generate B2O3, CO etc. B4C has anti-oxidant and corrosion resistance. This makes it suitable for use over a long period of time in high temperature and corrosive environment.
Boron carbide's high hardness, melting point, and heat transmission make it a popular material in many industries. Hardness of 3500kg/mm2, melting point 2450, and heat transfer rate 135W/m*K are among the characteristics that make boron carbide so popular in industries, military, aerospace, and other fields.
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