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Investigation of the Role of Calcium Borate in the Growth of Hexagonal Boron Nitride Particles

Author

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  • Shota Daiki

    (Tokuyama Corporation, Japan)

  • Toshihiro Ishikawa

    (Tokyo University of Science, Japan)

Abstract

Hexagonal boron nitride (h-BN) powder is a promising thermally conductive filler in resins and controlling its particle size is important. To obtain h-BN powder with a large particle size as well as high purity and crystallinity, high-temperature heat treatment over 1800 oC in N2 gas atmosphere is effective. Carbothermal reduction nitridation (CRN) involves carbothermic reduction of boric oxide in N2 gas atmosphere. In CRN using a CaO promoter, h-BN particles with large sizes can be produced through a simple heat-treatment process. During CRN, CaO forms calcium borate (CaO-B2O3), which prevents the vaporization of B2O3 and promotes h-BN particle growth at high temperatures. Up to now, the effect of CaO-B2O3 on the growth of h-BN particles during CRN is unclear. In this study, the role of CaO-B2O3 in the growth of h-BN particles during CRN was clarified via experimentation using various approaches. The results led to the ideal reaction process of CRN using a CaO promoter to produce large-particle-size h-BN powder.

Suggested Citation

  • Shota Daiki & Toshihiro Ishikawa, 2022. "Investigation of the Role of Calcium Borate in the Growth of Hexagonal Boron Nitride Particles," European Journal of Engineering and Technology Research, European Open Science, vol. 7(3), pages 114-118, May.
    • Handle: RePEc:epw:ejeng0:v:7:y:2022:i:3:id:62834
    DOI: 10.24018/ejeng.2022.7.3.2834
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