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Powder Preparation and Sintering Characteristics of Rare‐Earth Sesquisulfide Ceramics
Author(s) -
VaughanForster Cheryl M.,
White William B.
Publication year - 1997
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.1151-2916.1997.tb02826.x
Subject(s) - ceramic , sintering , materials science , graphite , rare earth , chemical engineering , mineralogy , metallurgy , decomposition , chemistry , organic chemistry , engineering
Dense ceramics were prepared from rare‐earth sesquisulfides. Extremely fine‐grained precursor oxides were synthesized by evaporative decomposition of solutions. The sesquisulfides were synthesized by direct reaction of the oxides with flowing H 2 S in the presence of graphite. These reactive, fine‐grained, EDS‐derived sulfides could be sintered into ceramic compacts that achieved 92–98% of theoretical density. In comparison, the same processing conditions with 25–50 m stock powder produced ceramics with only 70–80% of theoretical density.