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Microstructure and Fracture Toughness of Hot‐Pressed Zirconia‐Toughened Sialon
Author(s) -
Cain Markys G.,
Lewis Mike H.
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.tb03918.x
Subject(s) - microstructure , materials science , fracture toughness , composite material , yttria stabilized zirconia , cubic zirconia , volume fraction , hot pressing , toughness , zirconium , sialon , ceramic , metallurgy
Zirconia‐toughened sialon composites have been fabricated using conventional hot‐pressing techniques. The fracture toughness and microstructure were determined for CeO 2 ‐and Y 2 O 3 ‐stabilized ZrO 2 additives and also as a function of volume percent ZrO 2 . The yttria system showed a linear increase in fracture toughness with increasing volume fraction zirconia content while the ceria‐stabilized system exhibited a peak in fracture toughness at 20 vol % ZrO 2 content. The fracture toughness at 800°C was measured and correlated with the microstructure. High‐temperature stability was determined and it was found that the deleterious nitride phases of zirconium could be precluded from the microstructure.