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13.1: Invited Paper : Carbonation Reaction of (Ca, Mg)O Protective Layer on PDP
Author(s) -
Motoyama Yasushi,
Kato Daisuke,
Seki Masahiko
Publication year - 2012
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/j.2168-0159.2012.tb05733.x
Subject(s) - carbonation , power consumption , annealing (glass) , layer (electronics) , chemistry , materials science , chemical engineering , mineralogy , nanotechnology , metallurgy , composite material , power (physics) , thermodynamics , physics , engineering
Abstract We have been applying a low discharge voltage (Ca, Mg)O protective layer to plasma display panels (PDPs) to reduce their power consumption. However, (Ca, Mg)O is highly reactive with CO 2 , and the resulting carbonate formation during high‐temperature panel sealing in air impairs the low discharge voltage characteristic. We investigated the mechanism of the carbonation reaction that occurs on a (Ca, Mg)O surface during annealing in air at 450°C and found that the CO 2 diffuses through the formed CaCO 3 layer and that a (Ca, Mg)O + CO 2 r̊ CaCO 3 + MgO reaction then occurs. This carbonation reaction evidently stops when the growing MgO finally forms a layer at all boundaries between the CaCO 3 and (Ca, Mg)O regions.