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Mechanical Properties and Fracture Toughness of α‐Al 2 O 3 ‐Platelet‐Reinforced Y‐PSZ Composites at Room and High Temperatures
Author(s) -
Huang XueNing,
Nicholson Patrick S.
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.tb03754.x
Subject(s) - materials science , fracture toughness , composite material , sintering , platelet , tape casting , toughness , casting , medicine , immunology
YPSZ/Al 2 O 3 ‐platelet composites were fabricated by conventional and tape‐casting techniques followed by sintering and HIPing. The room‐temperature fracture toughness increased, from 4.9 MPa·m 1/2 for YPSZ, to 7.9 MPa·m 1/2 (by the ISB method) for 25 mol% Al 2 O 3 platelets with aspect ratio = 12. The room‐temperature fiexural strength decreased 21% and 30% (from 935 MPa for YPSZ) for platelet contents of 25 vol% and 40 vol%, respectively. Al 2 O 3 platelets improved the high‐temperature strength (by 110% over YPSZ with 25 vol% platelets at 800°C and by 40% with 40 vol% platelets at 1300°C) and fracture toughness (by 90% at 800°C and 61% at 1300°C with 40 vol% platelets). An amorphous phase at the Al 2 O 3 ‐platelet/YPSZ interface limited mechanical property improvement at 1300°C. The influence of platelet alignment was examined by tape casting and laminating the composites. Platelet alignment improved the sintered density by >1% d th , high‐temperature strength by 11% at 800°C and 16% at 1300°C, and fracture toughness by 33% at 1300°C, over random platelet orientation.