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

Shota Daiki and Toshihiro Ishikawa
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Shota Daiki: Tokuyama Corporation, Japan
Toshihiro Ishikawa: Tokyo University of Science, Japan

European Journal of Engineering and Technology Research, 2022, vol. 7, issue 3, 114-118

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.

Keywords: Boron nitride; Heat-treatment; Particle growth (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:epw:ejeng0:v:7:y:2022:i:3:id:62834

DOI: 10.24018/ejeng.2022.7.3.2834

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