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Thermal Expansion of Silicon Carbide Monofilaments and Silicon Carbide–Borosilicate Composites
Author(s) -
Elkind Alexander,
Barsoum Michel,
Kangutkar Pramod
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.tb05520.x
Subject(s) - borosilicate glass , thermal expansion , materials science , composite material , silicon carbide , atmospheric temperature range , carbide , volume fraction , fiber , silicon , metallurgy , thermodynamics , physics
The coefficient of thermal expansion (CTE) of a 140‐μm‐diameter SiC monofilament was determined to be 6.5 ± 0.5 × 10 −60 C −1 in the temperature range 25°–900°C. Heat treatment of the fibers at 1400°C for 90 min resulted in both an increase in the intensities of the SiC peaks and a reduction of their width, indicating some grain growth. Furthermore, heat treatment of the fibers for 2 h at 1600°C in vacuum reduced their CTE to 5.7 × 10 −60 C −1 . The anomalously high CTE and its decrease upon heat treatment were attributed to the presence of a large fraction of the atoms in the boundaries between the nanometer β‐SiC grains. The thermal expansion coefficients of a series of SiC/borosilicate composites were measured as a function of fiber volume fraction in the temperature range 25°–500°C and found to follow the rule of mixtures.