Effect of applied pressure and sintering aid on phase separation and crystallization behavior of amorphous Si3N4-BN composite powder

Hironori Kugimoto, Masato Uehara, Naoya Enomoto, Junichi Hojo

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Si3N4-BN nanocomposites are formed via phase separation and crystallization of amorphous Si3N4-BN composite powder during sintering. Amorphous Si3N4-BN composite powders were prepared by a vapor phase reaction method. To clarify the effect of applied pressure and sintering aid on the phase separation and crystallization behavior, the composite powders were hot-pressed and pressurelessly sintered with and without Y2O3-Al2O3 sintering aid. Si3N4 crystallized into α-phase at 1600°C without sintering aid, and into β-phase at 1400°C with sintering aid. It was found that the crystallization of Si3N4 and BN was promoted by applied pressure and sintering aid. On the other hand, the phase separation of BN from Si3N4 occurred around 1400°C regardless of applied pressure and sintering aid.

    Original languageEnglish
    Pages (from-to)491-495
    Number of pages5
    JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
    Volume49
    Issue number6
    DOIs
    Publication statusPublished - Jun 2002

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Industrial and Manufacturing Engineering
    • Metals and Alloys
    • Materials Chemistry

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