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Preparation of Porous Cr 3 C 2 Grains with Cr 2 O 3
Author(s) -
Hashimoto Shinobu,
Yamaguchi Akira
Publication year - 1996
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.1151-2916.1996.tb09007.x
Subject(s) - porosity , graphite , materials science , porous medium , morphology (biology) , crystallography , mineralogy , crucible (geodemography) , analytical chemistry (journal) , chemistry , metallurgy , composite material , computational chemistry , chromatography , biology , genetics
Porous Cr 3 C 2 grains (∼300 to 500 μm) with ∼10 wt% of Cr 2 O 3 were prepared by heating a mixture of MgCr 2 O 4 grains and graphite powder at 1450° to 1650°C for 2 h in an Al 2 O 3 crucible covered by an Al 2 O 3 lid with a hole in the center. The porous Cr 3 C 2 grains exhibited a three‐dimensional network skeleton structure. The mean open pore diameter and the specific surface area of the porous grains formed at 1600°C for 2 h were ∼3.5 (μm and ∼6.7 m 2 /g, respectively. The present work investigated the morphology and the formation conditions of the porous Cr 3 C 2 grains, and this paper will discuss the formation mechanism of those grains in terms of chemical thermodynamics.