Growth of tubular boron nitride filaments
- 109 Downloads
Considering the similarity between graphite and hexagonal boron nitride (h-BN) structures, this study aims to elaborate boron nitride filaments analogous to filamentous carbon. Filamentous carbon is obtained by decomposition of a hydrocarbon coming into contact with a metal belonging to the iron family. Dissolving carbon in this metal leads to the precipitation of filamentous carbon around metallic grains. In the case of h-BN, the metallic phase may be zirconium owing to the solubility of C and N in this metal, although in practice it is easier to use ZrB2. BN filaments were obtained when B2H6 and NH3 (or N2) came into contact with this compound (or borides of related metals) at temperatures around 1100 °C. Nevertheless it has been shown that BN filaments also occurred in the absence of B2H6; therefore the boron of the filaments originates in the boride. TEM observations showed that BN filaments exhibit structure, morphology and dimensions (φ∼0.1 μm, L∼1–10 μm) analogous to those of C filaments, although the formation mechanisms are different.
KeywordsPrecipitation Graphite Zirconium Boron Hydrocarbon
Unable to display preview. Download preview PDF.
- 1.M. Endo and K. Komaki, in Proceedings of the 16th Biennial Conference on Carbon, San Diego, June 1983 edited by R. J. Price and G. B. Engle (American Carbon Society) p. 523.Google Scholar
- 2.M. Coulon, N. Kandani, L. Bonnetain and J. Maire, French Patent N∘ 84.06365 (1984).Google Scholar
- 4.F. Benissad, PhD Thesis, Grenoble, 1986.Google Scholar
- 5.M. Hillert and N. Lange, Z. Krist. 24 (1958) 111.Google Scholar
- 8.R. T. K. Baker and P. S. Harris, in “Chemistry and Physics of Carbon”, Vol. 14, edited by P. L. Jr. Walker and P. A. Thrower (Marcel Dekker, New York, 1978) p. 83.Google Scholar
- 10.A. Jr. Sacco, in “Carbon Fibers, Filaments and Composites”, edited by J. L. Figueiredo, C. A. Bernardo, R. T. K. Baker and K. J. Huttinger (Nato Asi Series Vol. 177, Kluwer, Dordrecht, 1989) p. 459.Google Scholar
- 14.E. Rudy and F. Benesovsky, Mon. Chemie 92 (1961) 424.Google Scholar
- 15.P. Gleize, S. Herreyre, P. Gadelle, M. Mermoux, N. C. Cheynet and L. Abello, submitted to J. Mater. Sci. Lett. Google Scholar
- 17.F. Seon, French Patent N∘ 88-08579 (1988).Google Scholar
- 21.P. Gadelle, in “Carbon Fibers, Filaments and Composites”, edited by J. L. Figueiredo, C. A. Bernardo, R. T. K. Baker and K. J. Huttinger (Nato Asi Series Vol. 177, Kluwer, Dordrecht, 1989) p. 95.Google Scholar