The characterization and measurement of interfacial toughness for Si3N4/BN composites by the four-point bend test

The interfacial toughness of Si3N4/BN composites with different interphase compositions was characterised. A single-interlayer type of sandwich material Si3N4/BN/Si3N4, with one preset crack path connecting directly to the BN interphase in the centre of one side of the Si3N4 matrix, was designed and...

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Veröffentlicht in:Journal of the European Ceramic Society 2004-08, Vol.24 (9), p.2861-2868
Hauptverfasser: LINHUA ZOU, YONG HUANG, WANG, Chang-An
Format: Artikel
Sprache:eng
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Zusammenfassung:The interfacial toughness of Si3N4/BN composites with different interphase compositions was characterised. A single-interlayer type of sandwich material Si3N4/BN/Si3N4, with one preset crack path connecting directly to the BN interphase in the centre of one side of the Si3N4 matrix, was designed and fabricated. Sandwiched sample bars measuring 3 x 4 x 50 mm were cut and machined. The load-displacement curves for the samples were obtained using the four-point bend test, and the interfacial toughness was calculated, based on the model for a specimen with bimaterial interface. The interfacial toughness was measured for composites with interphases strengthened by Si3N4 or Al2O3 modifiers. The method was proved to be viable. The effectiveness of the method is discussed and the reasons for its effectiveness explained. 13 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2003.08.006