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Processing‐Related Fracture Origins: I, Observations in Sintered and Isostatically Hot‐Pressed A1 2 O 3 /ZrO 2 Composites
Author(s) -
LANGE F. F.
Publication year - 1983
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.1151-2916.1983.tb10068.x
Subject(s) - sintering , fractography , hot isostatic pressing , materials science , fracture (geology) , agglomerate , composite material , relative density , hot pressing , grain boundary , microstructure
Strengths of sintered Al 2 O 3 /ZrO 2 composites are much lower than those of hot‐pressed composites due to large flaws associated with the sintering process. Fractography has shown that cracklike internal surfaces are at the fracture origins of the sintered materials. It is hypothesized that the cracklike internal surfaces are developed as a result of differential sintering of agglomerates relative to their surrounding powder compact. Isostatic hot‐pressing of the sintered composites quickly eliminated the cracklike internal surface. Flaws responsible for fracture of the isostatically hot‐pressed composites were low‐density regions that are not as easily eliminated.