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Processing and Properties of Alumina‐Graphite Platelet Composites
Author(s) -
Kellett Bruce J.,
Wilkinson David S.
Publication year - 1995
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.1151-2916.1995.tb08469.x
Subject(s) - materials science , graphite , composite material , flake , microstructure , perpendicular , tape casting , pressing , hot pressing , fracture (geology) , ceramic , geometry , mathematics
Fine‐grain Al 2 O 3 ‐graphite platelet composites have been fabricated by both filter pressing and tape casting with up to 50 vol% of fine or coarse graphite flakes. Filter pressing behavior remains unchanged with coarse graphite flake additions. Strength of hot‐pressed specimens decreases from about 350 to about 50 MPa with 50 vol% graphite. Preliminary experiments indicate that platelet orientation has a significant effect on strength: Platelets oriented perpendicular to the fracture plane and face‐on to the crack front are about 20% weaker than composites with platelets oriented both perpendicular to the fracture plane and edge‐on to the crack front. This suggests that the flakes behave as oriented voids in the microstructure.