What is Boron carbide

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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 used widely in the aerospace and military industries for its hardness and melting point. The article will give a detailed description of the physical properties and chemical composition, preparation techniques, performance characterization and application fields.

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. It has a thermal conductivity of 97W/m*K. This 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 a good choice for long-term usage in high-temperature, corrosive environments.

Preparation method

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

Methode de réduction du carbothermal

Carbon thermal reduction (CTR) is widely used to prepare boron carbide . The reaction equation is B2O3+3C - B4C+CO. The reaction formula is B2O3+3C + B4C+CO. The reaction temperature ranges from 1500 to 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 a reaction between boric acid (or borax) to create boron carbide. The reaction formula is B2O3+3C + B4C. The reaction temperature ranges between 1800 and 2000°C. The boron-carbide prepared using this method is high in purity, with fine particles. However, the process is complicated and expensive.

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. Reaction temperature ranges between 1000-1200°C. This method yields boron-carbide with high purity, superfine particles and a complex and expensive process.

Performance Characterization

The performance characterisation of boron carbide The term mainly refers to physical, chemical, or mechanical properties.

Physical property

Density, conductivity, and thermal conductivity are the main physical properties of Boron carbide. Among these, the density of the boron carbide material is 2.52g/cm3, its conductivity is 10-6S/m. And the 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 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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