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Mechanical Properties of Infiltrated Alumina‐Y‐TZP Composites
Author(s) -
Glass S. Jill,
Green David J.
Publication year - 1996
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.1151-2916.1996.tb08967.x
Subject(s) - materials science , transgranular fracture , agglomerate , infiltration (hvac) , composite material , fracture toughness , grain boundary , ceramic , conductivity , microstructure , intergranular fracture , chemistry
Small Al 2 O 3 additions (∼ 4 vol%) made to Y‐TZP using an infiltration technique increased the fracture toughness and strength by ∼15% and the amount of transgranular fracture. Ionic conductivity measurements showed decreased grain‐boundary conductivity, confirming a change in the grain‐boundary composition. The predominant failure origins for both the unmodified Y‐TZP and the Al 2 O 3 —Y‐TZP were surface flaws related to agglomerates in the original powder. Finishing reduced the severity of these flaws and substantially increased the strength of both materials (>50%). The infiltration approach introduced a new flaw population in some specimens; however, this problem was overcome by a simple processing modification.