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Effect of calcium carbonate addition on carbothermic formation of hexagonal boron nitride
Date
2008-01-01
Author
ÇAMURLU, HASAN ERDEM
SEVİNÇ, NACİ
Topkaya, Yavuz Ali
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Effect of CaCO3 on formation of hexagonal boron nitride (h-BN) was investigated by holding CaCO3 free and CaCO3 added activated carbon-boric oxide mixtures under nitrogen atmosphere at 1500 degrees C for 30-120 min. Amount of CaCO3 addition was varied in the range of 0-50 wt.% of the initial mixture. Products were characterized by powder X-ray diffractometry, FT-IR analysis, quantitative chemical analysis, scanning electron microscopy and BET specific surface area analysis. It was observed that calcium carbonate addition led to an increase in the amount and the grain size of hexagonal boron nitride and a decrease in the amount of boron carbide forming. Ten weight percent calcium carbonate addition was found to be the optimum value for increasing the yield of hexagonal boron nitride and decreasing the formation of boron carbide.
Subject Keywords
Materials Chemistry
,
Ceramics and Composites
URI
https://hdl.handle.net/11511/40043
Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
DOI
https://doi.org/10.1016/j.jeurceramsoc.2007.07.002
Collections
Department of Metallurgical and Materials Engineering, Article
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H. E. ÇAMURLU, N. SEVİNÇ, and Y. A. Topkaya, “Effect of calcium carbonate addition on carbothermic formation of hexagonal boron nitride,”
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
, pp. 679–689, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40043.