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Erosion Response of Highly Anisotropic Silicon Nitride
Author(s) -
Zhang Yu,
Cheng YiBing,
Lathabai Srinivasarao,
Hirao Kiyoshi
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00014.x
Subject(s) - microstructure , materials science , erosion , whiskers , silicon nitride , composite material , fracture toughness , grain size , toughness , anisotropy , layer (electronics) , geology , paleontology , physics , quantum mechanics
The erosion rates and impact damage of two sintered Si 3 N 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.