Improvement of Chemical Stability of a CaMgO Protective Layer

Kato, Daisuke; Motoyama, Yasushi; Seki, M.

doi:10.3169/itej.65.1326

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2013

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“…The chemical stability of the (Ca, Mg)O films was significantly improved when we reduced the CaO concentration. We obtained good chemical stability when the concentration was from 0% to 40% . A high CaO concentration has been reported to be necessary to obtain a low firing voltage, so we measured the firing voltage of panels with a (Ca, Mg)O protective layer (Fig.…”

Section: Resultsmentioning

confidence: 99%

Carbonation reaction of (Ca, Mg)O protective layer on plasma display panel

Motoyama¹,

Kato²,

Saito³

et al. 2013

J Soc Info Display

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We have been applying a low discharge voltage (Ca, Mg)O protective layer to plasma display panels to reduce their power consumption. However, (Ca, Mg)O is highly reactive with CO2, 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 CO2 diffuses through the formed CaCO3 layer and that a (Ca, Mg)O + CO2 → CaCO3 + MgO reaction then occurs. This carbonation reaction evidently stops when the growing MgO finally forms a layer at all boundaries between the CaCO3 and (Ca, Mg)O regions.

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Section: Resultsmentioning

confidence: 99%