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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 an active configuration. They can be substituted by B atoms, forming a solid solution replacement.
B4C’s molecular weight is 52.25 and it has C21.74% & B78.25%. The color is usually gray or black. The density is 2.519g/cm3, the Mohs Hardness is 9.35, and the microhardness is 49GPa. This powder can grind up to 60%-70% better than diamond.
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. Thermal conductivity is 121.4W/m*k for 100degC, and 62.79W/m*k for 700degC. B4C powder can be used primarily as an abrasive. B4C hot-pressed products are suitable for wear-resistant or heat-resistant parts. B4C primarily is used in the refractory industries as an anti-oxidant additive. Unshaped materials enhance the strength and resistance to corrosion of the body.
The properties and synthesis of Boron Carbide
B4C powder is commonly synthesized by reducing boron anhydride and excess carbon.
2B2O3+7C-B4+6CO|
The synthesis reaction may be carried out either in an electric arc or a muffle oven. In a resistance-type furnace, the mixtures of boron anhydride B2O3 with carbon C are heated to a lower decomposition temperature than B4C. This is a more efficient synthesis. 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 85% fixed carbon 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 a ball-mill and then add them to the arc. B4C can be produced by reducing and Carbonizing the furnace from 1700-2300. Finaly, the frit will be sorted and cleaned, then crushed, ground and pickled.
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