Crystallization behavior of cubic boron nitride from an amorphous BN precursor via high-pressure, high-temperature treatment with controlled water addition

Takahiro Mochizuki, Yusuke Yamamoto, Naokazu Idota, Fumio Kawamura, Takashi Taniguchi, Yoshiyuki Sugahara

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Crystallization behavior of cubic boron nitride (c-BN) from amorphous boron nitride (a-BN) by high-pressure, high-temperature (HP-HT) treatment with the intentional addition of a controlled amount of water was studied. The a-BN precursor was prepared by pyrolysis of a boric acid-urea complex with urea/boric acid = 2 at 1000 °C for 3 h under an ammonia atmosphere. Hexagonal BN (h-BN) were initially crystallized from a-BN containing 2 mass% of water after HP-HT treatment at 7.7 GPa and 1200 °C, and the formation of c-BN was observed after 5 min. The crystallization of c-BN from a-BN containing 8 mass% of water after HP-HT treatment at 7.7 GPa and 1200 °C was observed even after 1 min, indicating that the crystallization of c-BN was promoted by increasing the amount of water added. In addition, since neither h-BN nor c-BN was crystallized from a-BN without intentional water addition after the same HP-HT treatment, the addition of water promoted the crystallization of both h-BN and c-BN from a-BN. Since no transformation from h-BN to c-BN was observed during HP-HT treatment at 7.7 GPa and 1200 °C, it was concluded that c-BN was directly crystallized from a-BN. After HP-HT treatment at 7.7 GPa and 1650 °C for 1 min, both h-BN and c-BN were crystallized from a-BN containing 8 mass% of water. These results clearly indicate that the addition of water has a positive effect on crystallization of c-BN from a-BN.

    Original languageEnglish
    Pages (from-to)3565-3569
    Number of pages5
    JournalJournal of the European Ceramic Society
    Volume36
    Issue number15
    DOIs
    Publication statusPublished - 2016 Nov 1

    Fingerprint

    Cubic boron nitride
    Boron nitride
    Crystallization
    Water
    Temperature
    Boric acid
    Urea
    boron nitride
    Ammonia
    Pyrolysis

    Keywords

    • Amorphous boron nitride
    • Cubic boron nitride
    • High-pressure
    • High-temperature treatment

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

    Cite this

    Crystallization behavior of cubic boron nitride from an amorphous BN precursor via high-pressure, high-temperature treatment with controlled water addition. / Mochizuki, Takahiro; Yamamoto, Yusuke; Idota, Naokazu; Kawamura, Fumio; Taniguchi, Takashi; Sugahara, Yoshiyuki.

    In: Journal of the European Ceramic Society, Vol. 36, No. 15, 01.11.2016, p. 3565-3569.

    Research output: Contribution to journalArticle

    Mochizuki, Takahiro ; Yamamoto, Yusuke ; Idota, Naokazu ; Kawamura, Fumio ; Taniguchi, Takashi ; Sugahara, Yoshiyuki. / Crystallization behavior of cubic boron nitride from an amorphous BN precursor via high-pressure, high-temperature treatment with controlled water addition. In: Journal of the European Ceramic Society. 2016 ; Vol. 36, No. 15. pp. 3565-3569.
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    AU - Yamamoto, Yusuke

    AU - Idota, Naokazu

    AU - Kawamura, Fumio

    AU - Taniguchi, Takashi

    AU - Sugahara, Yoshiyuki

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    KW - Cubic boron nitride

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    KW - High-temperature treatment

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