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Processing of Boron Carbide‐Aluminum Composites
Author(s) -
Halverson Danny C.,
Pyzik Aleksander J.,
Aksay IIhan A.,
Snowden William E.
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.tb06216.x
Subject(s) - boron carbide , materials science , wetting , aluminium , composite material , carbide , fracture toughness , boron , silicon carbide , phase (matter) , metal , toughness , microstructure , metallurgy , chemistry , organic chemistry
The processing problems associated with boron carbide and the limitations of its mechanical properties can be significantly reduced when a metal phase (e.g., aluminum) is added. Lower densification temperatures and higher fracture toughness will result. Based on fundamental capillarity ther modynamics, reaction thermodynamics, and densification kinetics, we have established reliable criteria for fabricating B 4 C–Al particulate composites. Because chemical reactions cannot be eliminated, it is necessary to process B 4 C–AI by rapidly heating to near 1200°C (to ensure wetting) and subsequently heat‐treating below 1200°C (for microstructural development).