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Phase and Property Studies of Boron Carbide–Boron Nitride Composites
Author(s) -
Ruh Robert,
Kearns Michael,
Zangvil Avigdor,
Xu Youren
Publication year - 1992
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.1151-2916.1992.tb04152.x
Subject(s) - boron carbide , materials science , boron nitride , flexural strength , boron , composite material , carbide , solubility , nitride , hot pressing , phase (matter) , lattice constant , grain boundary , microstructure , chemistry , layer (electronics) , organic chemistry , diffraction , optics , physics
Boron carbide–boron nitride particulate composites were fabricated by vacuum hot‐pressing. Near‐theoretical densities of B 4 C were obtained, but percent theoretical densities decreased with increasing amounts of BN. The grain size of B 4 C and BN was not affected by composition, but the amount of twinning in B 4 C decreased with increasing BN content. No third phase was found at the B 4 C–BN interface by analytical STEM analysis. Lattice parameter measurements indicated slight solubility of B 4 C in BN, but no solubility of BN in B 4 C for samples hot‐pressed at 2250°C. Room‐temperature flexural strength measurements revealed a sharply decreasing strength with increasing BN content up to 40% BN, and then relatively constant values with greater amounts of BN.