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Separate Growth of α‐ and β‐Si 3 N 4 Whiskers on or near a Carbon Substrate by Carbothermal Reduction
Author(s) -
Shimada Shiro,
Kataoka Tomoyuki
Publication year - 2001
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.1151-2916.2001.tb01031.x
Subject(s) - whiskers , whisker , scanning electron microscope , materials science , substrate (aquarium) , carbon fibers , carbothermic reaction , nitrogen , carbon black , growth rate , mineralogy , chemical engineering , analytical chemistry (journal) , composite material , chemistry , carbide , oceanography , natural rubber , geometry , organic chemistry , mathematics , chromatography , composite number , engineering , geology
Whiskers of α‐ and β‐Si 3 N 4 were grown on or near a carbon black substrate, respectively, 10 mm downstream from a mixed starting powder of low‐grade silica and carbon, in flowing nitrogen gas at 1400°C. The parameters (flowing nitrogen gas rate, growth time, grade of silica, and type of carbon) that promoted growth of the whiskers were examined in view of increasing the whisker yield. The shapes and sizes of both types of whiskers were observed by scanning electron microscopy (SEM). The separate growth of the whiskers is discussed here, based on X‐ray diffraction analysis and SEM observation with energy‐dispersive X‐ray analysis.