Properties of Si 3N 4-BN composite ceramics by spark plasma sintering

Hailong Qiu, Juan Zhang, Hongmin Zhu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Dense Si 3 N 4 - BN compsite ceramics were fabrica-ted by spark plasma-sintering at 1 500, 1 600 and 1 650 °C under 50 MP a for 5 min using Si 3N 4 and BN powders as starting materials and 2 mass% Al 20 3 and 6 mass% Y 20 3 as sintering additives. The volume fracion ofBN n Si 3N 4 -BN composite powders was chosen as 10%, 20%, and 30%, respectively. The results of XRD and SEM show hat a-Si 3N 4 completely urns nto sintered at 1 650 °C; the addition of BN hinders the growth of Si 3N 4 grains, refining he structure; Vickers hardness and fracture toughness of the composite ceramics decrease with the increase of BN content.

Original languageEnglish
Pages (from-to)36-39
Number of pages4
JournalChina's Refractories
Volume21
Issue number1
Publication statusPublished - 2012 Aug 6
Externally publishedYes

Keywords

  • Mechanical properties
  • Silicon nitride;Boron nitride;Composite ceramics
  • Spark plasma sintering

ASJC Scopus subject areas

  • Ceramics and Composites

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