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Interaction of Low‐Expansion NZP Ceramics with Na2SO4 at 1000°C
Author(s) -
Lee Woo Y.,
Stinton David P.,
Joslin Debra L.
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.tb08148.x
Subject(s) - ion , impurity , analytical chemistry (journal) , penetration (warfare) , materials science , ion exchange , chemistry , mineralogy , nuclear chemistry , chromatography , organic chemistry , operations research , engineering
The interaction between several low‐expansion NZP materials and Na 2 SO 4 at 1000°C in pure O 2 was studied. Ba 1.25 Zr 4 P 5.5 Si 0.5 O 24 experienced extensive cracking and delamination upon reaction with Na 2 SO 4 . On the other hand, Ca 0.5 Sr 0.5 Zr 4 P 6 O 24 remained intact in terms of visual appearance and had no significant weight loss or gain. However, the ion exchange between Na + ions and Ca +2 ions was observed to be sufficiently rapid to allow the penetration of the Na + ions into the test specimens in 100 h. The segregation of Ca to the specimen surface was observed due to the ion exchange. Ca 0.6 Mg 0.4 Zr 4 P 6 O 24 was also tested, but its stability could not be properly assessed because the as‐received specimens contained a significant amount of MgZr 4 P 6 O 24 as an impurity phase.