Carbothermic synthesis of boron carbide with low free carbon using catalytic amount of magnesium chloride

  • Masoud BakhshiEmail author
  • Ali Souri
  • Mohammad K. AminiEmail author
Original Paper


Microcrystalline boron carbide was synthesized from boric acid and carbon black in the presence of a small amount of magnesium chloride by carbothermal reduction method at 1600 °C. The presence of magnesium chloride in the mixture has a determining effect in increasing the yield of the reaction and lowering the residual free-carbon content of the resulting boron carbide. We have also shown that, compared to several reported carbothermal reduction methods, the present catalyst also considerably lowers the excess amount of boron compound precursor required to afford boron carbide with negligible free carbon. X-ray powder diffraction (XRD) pattern indicated that the product was rhombohedral B4C. No peak, corresponding to free carbon, was observed in the XRD diffraction pattern of the B4C product formed from H3BO3:C:MgCl2 in the molar ratio of 1.0:1.45:0.01. Scanning electron microscopy image also showed that the product is fully crystalline and consisted of uniformly sized particles.


Boron carbide Boric acid Carbon black Carbothermal reduction Magnesium chloride 



The authors gratefully acknowledge full support of this work by the Sooreh Company, Isfahan, Islamic Republic of Iran.


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Copyright information

© Iranian Chemical Society 2019

Authors and Affiliations

  1. 1.Sooreh CompanyIsfahanIslamic Republic of Iran
  2. 2.Department of ChemistryUniversity of IsfahanIsfahanIslamic Republic of Iran

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