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Debonding in Multilayered Composites of Zirconia and LaPO 4
Author(s) -
Marshall David B.,
Morgan Peter E. D.,
Housley Robert M.
Publication year - 1997
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.1151-2916.1997.tb03038.x
Subject(s) - materials science , composite material , cubic zirconia , composite number , phase (matter) , pyrochlore , toughening , ceramic , chemistry , toughness , organic chemistry
Multilayered composites consisting of LaPO 4 (La‐monazite) layers alternating with various ZrO 2 ‐based materials were fabricated to investigate whether LaPO 4 provides a weakly bonded interface suitable for promoting toughening, as previously observed in the system LaPO 4 /Al 2 O 3 . The following ZrO 2 ‐based materials were assessed: Y‐ZrO 2 , Y‐ZrO 2 /Al 2 O 3 , Ce‐ZrO 2 , and Ce‐ZrO 2 /Al 2 O 3 . Debonding was observed in all cases. The composites containing Y‐ZrO 2 and Y‐ZrO 2 /Al 2 O 3 were stable, with no reactions, at temperatures up to at least 1600°3C. However, in the composites containing Ce‐ZrO 2 , interdiffusion of Ce and La occurred, resulting in formation of a pyrochlore‐like phase and, in the case of the Ce‐ZrO 2 /Al 2 O 3 composite, a (Ce,La)Al 11 O 18 magnetoplumbite phase.