Erosion response of highly anisotropic silicon nitride

Yu Zhang, Yi Bing Cheng, Srinivasarao Lathabai, Kiyoshi Hirao

Research output: Contribution to journalArticle

Abstract

The erosion rates and impact damage of two sintered Si 3N 4 materials with identical compositions but different microstructures were determined using a gas-blast-type erosion rig. The erodent particles used were SiC grits and the impact angles investigated were 30° and 90°. It was found that the erosion behavior of the two materials could not be related to their mechanical properties, such as hardness and fracture toughness as predicted by the theoretical erosion models. In fact, a close relationship was identified between their microstructure and the erosion mechanism. Microstructures containing evenly dispersed and uniaxially oriented reinforcing whiskers promoted grain-pullout, while the randomly oriented elongated grains hindered it.

Original languageEnglish (US)
Pages (from-to)114-120
Number of pages7
JournalJournal of the American Ceramic Society
Volume88
Issue number1
DOIs
StatePublished - Jan 2005

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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