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What is Boron Carbide?

Boron Carbide Powder belongs to the trigonal system. The unit cell contains 12 B and 3 C. The unit cell’s stereo diagonally connected C atoms are in a state of active configuration. They can be substituted by B atoms, forming a replacement solid and leaving the crystal lattice in order to form high-boron compounds.

B4C’s molecular weight is 52.25 and it has C21.74% as well as B78.25%. The color is usually gray or black.

B4C Powder has a melting temperature of 2450°C (decomposition). The coefficient for expansion at 1000degC (4.5×10-6degC-1) is 4.5×10-6degC-1. The thermal conductivity of B4C powder is 121.4W/m*k when it’s 100degC, and 62.79W/m*k when it’s 700degC. B4C powder can be used primarily as an abrasive. B4C hot-pressed products are suitable for wear-resistant or heat-resistant parts. B4C mainly acts as an anti-oxidant in the refractory industries. Unshaped materials enhance the body’s strength and resistance to corrosion.

The properties and synthesis of Boron Carbide

B4C powder is commonly synthesized by reducing boron anhydride and excess carbon.


The synthesis reaction may be carried out either in an electric arc or a muffle oven. In a resistance-type furnace, the best way to synthesize B4C is by heating boron anhydride B2O3 with carbon C until it reaches a lower decomposition temperature than B4C. B4C is broken down into boron and carbon rich phase in the electric-arc furnace because of the high temperature. The reaction product may contain a lot of free C (20%-30%). As a result, the B4C obtained is of slightly inferior quality.

In order to synthesize B4C using an electric arc, boric acids (with a content greater than 92%), artificial graphite with a fixed carbon of greater than 95%, and petroleum coke with a fixed carbon of greater than 85% are used. The theoretical dosage is calculated based on the reaction formula. The theoretical amount is approximately 2% higher. Each of artificial graphite and petroleum coke accounts for 50% of total carbon addition, which is then 3%-4% more than the theoretical amount. Add the three prepared raw materials to the arc and mix them in a ball-mill. B4C can then be obtained by carbonizing the furnace and reducing it between 1700-2300. Finaly, the frit will be sorted and cleaned, then crushed, ground, picked, sedimented and classified, etc. to produce B4C in various particle sizes.

(aka. Technology Co. Ltd., a trusted global chemical materials supplier & manufacturer has over 12 years experience in providing high-quality nanomaterials and chemicals. The B4C powder that we produce is of high purity with a fine particle size. If you need lower, please call us.

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