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Microstructure and Properties of Self‐Reinforced Silicon Nitride
Author(s) -
Pyzik Aleksander J.,
Beaman Donald R.
Publication year - 1993
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.1151-2916.1993.tb04010.x
Subject(s) - microstructure , materials science , whisker , silicon oxynitride , fracture toughness , silicon nitride , composite material , flexural strength , nitride , toughness , ceramic , silicon , metallurgy , layer (electronics)
Problems associated with manufacturing Si 3 N 4 /SiC‐whisker composites have been overcome by developing selfreinforced Si 3 N 4 with elongated β‐Si 3 N 4 grains formed in situ from oxynitride glass. This Si 3 N 4 –Y 2 O 3 –MgO–SiO 2 –CaO‐based material has a flexure strength >1000 MPa and fracture toughness >8 MPa·m ½ . The optimum combination of mechanical properties has been obtained with Y 2 O 3 :MgO ratios ranging from 3:1 to 1:2, CaO contents ranging from 0.1 to 0.5 wt%, and Si 3 N 4 contents between 90 and 96 wt%.