Effect of Si2N2O content on the microstructure, properties, and erosion of silicon nitride-Si2N2O in situ composites

Dong Soo Park, Hyun Ju Choi, Byung Dong Han, Hai Doo Kim, Dae-Soon Lim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Silicon nitride-Si2N2O in situ composites were prepared by hot pressing powder mixtures of α-Si3N4, 6 wt% Y2O3, 1 wt% Al2O3, and 0-12 wt% SiO2 X-ray diffraction (XRD) analysis indicated that the volume percents of Si2N2O, 13, 31, and 54 for the composites prepared with 0, 4, 8, and 12 wt% SiO2, respectively. XRD results also indicated that both silicon nitride grains and Si2N2O grains were laid down perpendicular to hot pressing direction. As the volume percent of Si2N2O increased, the width and the amount of elongated silicon nitride grains decreased, but the fracture toughness increased. Young's modulus of the in situ composites decreased as the Si2N2O content was increased. The erosion rate decreased as the Si2N2O content was increased, in part, due to both the increased fracture toughness and the reduced grain size. Erosion of the composites occurred primarily due to the grain dislodgment. The sample without Si2N2O experienced micro-chipping due to transgranular fracture.

Original languageEnglish
Pages (from-to)2275-2280
Number of pages6
JournalJournal of Materials Research
Volume17
Issue number9
Publication statusPublished - 2002 Sep 1
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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