Synthesis of boron carbide powder from polyvinyl borate precursor |
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Authors: | Ikuo Yanase Riichi Ogawara Hidehiko Kobayashi |
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Affiliation: | Department of Applied Chemistry, Faculty of Engineering, Saitama University, 255 Shimoohkubo, Saitama, 338-8570 Japan |
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Abstract: | Polyvinyl borate (PVBO) was prepared by the condensation of poly(vinyl alcohol) (PVA) and boric acid, and used as a precursor for boron carbide. Boron carbide powder was synthesized by the pyrolysis of the PVBO precursor in air at 600 °C for 2 h, followed by heat treatment in Ar flow at 1300 °C for 5 h, which is a relatively low temperature compared with conventional carbothermal methods. Pyrolysis of the PVBO precursor resulted in submicron-size particles of B2O3 dispersed in a carbon matrix. In addition, the pyrolysis temperature governed the carbon content in the pyrolyzed product of the PVBO precursor, which led to the synthesis of crystalline boron carbide powder with little free carbon. |
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Keywords: | Boron carbide Poly(vinyl alcohol) Boric acid Precursor |
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