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 has high heat transfer properties, high melting points, and high hardness. It’s widely used by industries, the military, aerospace and other fields. The article will give a detailed description of the physical properties and chemical composition, the preparation methods, the performance characterization and its application fields. References for research in other fields are also provided.

Physical Properties

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.

Chemical properties

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 suitable for long term use in high-temperature, corrosive environments.

Preparation method

Preparation methods for boron carbide The main methods are the carbon thermal decomposition method, the arc melting technique, and the chemical vapour deposit method.

Methode de réduction du carbothermal

Carbon thermal reduction (CTR) is widely used to prepare boron carbide . 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. This 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 equation is: B2O3+3C + B4C. The reaction temperature ranges between 18002000 degrees. This method yields boron-carbide with fine particles and high purity, but is costly and complex.

Chemical vapour deposition method

Chemical vapour deposition uses high temperature reactions of gaseous carbon black and borane 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.

Performance Characterization

Physical, chemical, mechanical, and other properties are primarily considered when describing the performance of boron carbide.

Physical Property

Density, conductivity, thermal resistance, etc. are the main physical properties of Boron carbide. The density is 2.52g/cm3, conductivity 10-6S/m, and thermal conductivity 97W/m*K.

Chemical property

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 suitable for long term use in high-temperature, corrosive environments.

Mechanical property

Boron carbide’s high hardness, melting temperature, and heat transfer 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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