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Hot Isostatically Pressed Alumina‐Silicon Carbide‐Whisker Composites
Author(s) -
Björk Lennart,
Hermansson Leif A. G.
Publication year - 1989
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.1151-2916.1989.tb07668.x
Subject(s) - whisker , whiskers , monocrystalline whisker , materials science , silicon carbide , composite material , ductility (earth science) , fracture toughness , carbide , hot pressing , toughness , creep
Alumina‐silicon carbide‐whisker composites were hot isostatically pressed at 1550°C and 200 MPa for 1 h. The silicon carbide whiskers were treated in different acid and gas environments before they were pressed. All samples exhibited linear elastic behavior with no ductility tendency. Improved strength and fracture toughness were obtained compared with unreinforced alumina. Mechanisms for the improved mechanical properties are discussed. These include grain growth control, whisker encapsulation of defects, and related stress relief at the defect.