Effect of grain growth and measurement on fracture toughness of silicon nitride ceramics

Jianfeng Yang, Tohru Sekino, Koichi Niihara

研究成果: Article査読

13 被引用数 (Scopus)

抄録

Two kinds of α-Si3N4 powders with different properties (high purity and low purity) were pressureless sintered using MgAl2O4-ZrO2 as sintering additives. The grain growth was controlled by sintering time and temperature. The fracture toughness was determined using indentation microfracture (IM) and single-edge-precracked-beam (SEPB) methods. A discrepancy of fracture toughness was found between the values obtained by these two methods, and the SEPB method provided higher fracture toughness than the IM method. Materials with more large elongated Si3N4 grains gave higher fracture toughness, R-curve behavior and larger discrepancy. This is contributed to the effects of grain bridging, pull-out and deflection by the large elongated Si3N4 grains. Comparing the specimens from two kinds of α-Si3N4 powders with different purity level, both gave high fracture toughness of over 9 MPa · m 1/2 by the SEPB method, while the E10 samples have a little higher flexural strength.

本文言語English
ページ(範囲)5543-5548
ページ数6
ジャーナルJournal of Materials Science
34
22
DOI
出版ステータスPublished - 1999 12 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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