Synthesis of Si3N4 composite nano-powders and evaluation of sintered bodies

Takanori Shinoura, Masato Uehara, Naoya Enomoto, Junichi Hojo

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Fine Si3N4 powder, Si3N4-TiN composite powder and Si3N4-BN-TiN composite powder were prepared by a vapor phase reaction method, and hot-pressed to investigate the effects of TiN inclusion in Si3N4-TiN composites and BN inclusion in Si3N4-BN-TiN composites on the microstructure and mechanical properties of sintered bodies. The prepared powders were fine with a size of about 80-100 nm. Hot pressing was carried out for 2h at 1800°C and 50 MPa in N2 with 6 wt% Y2O3 and 2 wt% Al2O3 as sintering aids. When the content of TiN was small, Si3N4-TiN composites included rod-like Si 3N4 grains dispersed in a fine Si3N4 matrix, having a high thermal shock resistance whilst retaining their fracture toughness. The thermal shock resistance of Si3N4-TiN composites was not improved by addition of the BN and the fracture toughness was reduced.

    Original languageEnglish
    Pages (from-to)210-213
    Number of pages4
    JournalJournal of Ceramic Processing Research
    Volume4
    Issue number4
    Publication statusPublished - Dec 1 2003

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites

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