In-situ carbon control in the preparation of precursors to boron carbide by a non-aqueous solution technique
Watts, Joshua L., Talbot, Peter Cade, Alarco, Jose A., & Mackinnon, Ian D.R. (2015) In-situ carbon control in the preparation of precursors to boron carbide by a non-aqueous solution technique. Journal of Materials Science and Engineering A, 5(1-2), pp. 8-20.
Synthesis of high quality boron carbide (B4C) powders is achieved by carbothermal reduction of boron oxide (B2O3) from a condensed boric acid (H3BO3)/polyvinyl acetate (PVAc) product. Precursor solutions are prepared via free radical polymerisation of vinyl acetate (VA) monomer in methanol in the presence of dissolved H3BO3. A condensed product is then formed by flash evaporation under vacuum. As excess VA monomer is removed at the evaporation step, the polymerisation time is used to manage availability of carbon for reaction. This control of carbon facilitates dispersion of H3BO3 in solution due to the presence of residual VA monomer. B4C powders with very low residual carbon are formed at temperatures as low as 1,250 °C with a 4 hour residence time.
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|Item Type:||Journal Article|
|Keywords:||boron carbide, solution synthesis, polymerisation, boric acid, poly vinyl acetate|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ORGANIC CHEMISTRY (030500) > Free Radical Chemistry (030501)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Solution Chemistry (030605)
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2015 David Publishing Company|
|Deposited On:||08 Jun 2015 23:15|
|Last Modified:||09 Jun 2015 23:42|
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