Effect of microstructural variables on the erosion of silicon nitride ceramics

Dong Soo Park, Hyeon Ju Choi, Dong Ho Han, Hai Doo Kim, Byung Dong Han, Dae Soon Lim, Il Soo Kim

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Silicon nitride ceramics with three different microstructures were prepared using three different silicon nitride powders and β-silicon nitride whiskers in order to study their erosion characteristics. Samples with a coarse microstructure were prepared by using a commercially available silicon nitride powder seeded with the whiskers. Samples with fine microstructures were obtained using fine silicon nitride powders that had been milled in toluene or in distilled water. The powder milled in toluene gained both carbon and oxygen during milling. Heating the powder at 1673 K for 10 h in a flowing nitrogen atmosphere reduced carbon and oxygen contents to the level of as-received powder. The powder milled in distilled water gained a significant amount of oxygen during milling, and silicon oxynitride (Si2N2O) was detected by X-ray diffraction analysis (XRD) from the sample sintered with it. The sample sintered with the powder milled in distilled water showed the finest microstructure and the lowest erosion rate among the samples. Erosion occurred mainly by dislodgment of grains.

Original languageEnglish
Pages (from-to)259-262
Number of pages4
JournalKey Engineering Materials
Volume247
Publication statusPublished - 2003 Sep 1
EventAdvanced Ceramics and Composites - Shanghai, China
Duration: 2002 Nov 192002 Nov 22

Keywords

  • Erosion
  • Microstructure
  • Silicon Nitride
  • Silicon Oxynitride

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Park, D. S., Choi, H. J., Han, D. H., Kim, H. D., Han, B. D., Lim, D. S., & Kim, I. S. (2003). Effect of microstructural variables on the erosion of silicon nitride ceramics. Key Engineering Materials, 247, 259-262.