Premium
Hollow Beads Composed of Nanosize Ca α‐SiAlON Grains
Author(s) -
Komeya Katsutoshi,
Zhang Cheng,
Hotta Mikinori,
Tatami Junichi,
Meguro Takeshi,
Cheng YiBing
Publication year - 2000
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.1151-2916.2000.tb01316.x
Subject(s) - sialon , carbothermic reaction , materials science , sintering , ceramic , morphology (biology) , chemical engineering , raw material , metallurgy , mineralogy , composite material , chemistry , carbide , organic chemistry , engineering , genetics , biology
Carbothermal reduction—nitridation (CRN) of SiO 2 is an attractive method to manufacture Si 3 N 4 powders with controlled grain morphology. Moreover, β‐SiAlON powders could also be synthesized from either pure powder mixture or some inexpensive raw minerals by CRN and the resulting powders favored the sintering of SiAlON product. However, there have been few works on preparing α‐SiAlON powders so far. In this work, Ca α‐SiAlON powder was synthesized by CRN of a SiO 2 —Al 2 O 3 —CaCO 3 mixture. An unusual morphology of hollow beads 200 to 500 nm in diameter with a great deal of nanosize α‐SiAlON particles around 10 to 30 nm in diameter was observed from the resultant Ca α‐SiAlON powders, which has not been reported for SiAlON ceramics before.