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Redox Behavior of Sn and S in Alkaline Earth Borosilicate Glass Melts with 1 mol% Na₂O
김기동,김효광 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
Redox investigation of Sn and S ion was attempted in alkaline earth borosilicate glass melts with only 1 mol% Na₂O by means of Square Wave Voltammetry (SWV). According to voltammograms, there was only one peak due to Sn4+/Sn2+ in melt doped with SnO₂. The calculated standard enthalpy and entropy of the reduction of Sn4+ to Sn2+ were 116kJ/mole and 62 J/mol K, respectively. The determined redox ratio, [Sn2+] / [Sn4+] in the temperature range of 1300~1600℃ was in 0.4~2.1. On the contrary, in the voltammogram of melt doped with BaSO₄ there was no peak due to S4+/So but shoulder that might be attributed to the adsorption of sulfur at the electrode. The absence of the peak related with S4+/So was discussed from the view-point of the thermal decomposition behavior of BaSO₄ in the glass batch.
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김기동,김효광,김준홍 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.8
The behavior of oxygen gas participating in fining was observed in CRT (Cathode Ray Tube) glass melts doped with Sb 2O5 orCeO2 by means of a yttria-stabilized zirconia (YSZ) electrode. The temperature dependence of the oxygen equilibrium pressure(PO2) or the activity in both melts showed typical behavior corresponding to a theoretical redox reaction. In other words, the PO2value of melts with CeO 2 was lower than that of melts with Sb 2O5 above 1250oC. The result implies that Sb2O5 is more efficientas a fining agent compared to CeO 2. On the other hand, melts from a batch containing Sb 2O5 and KNO 3 showed much higher PO2values compared to melts without KNO 3 above 1350oC. It is suggested that the addition of KNO 3 to a CRT glass batch contrib-utes partly to the first fining of the melts.
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김기동,김효광 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.2
The oxygen gas behavior in PDP (Plasma Display Panel) glas melts doped with sulfate (SO 42) or blast furnace slag (BFS, S2)or both by means of yttria-stabilized zirconia (YSZ) electrodes was observed after the first fining. The temperature dependence ofoxygen equilibrium pressure ( PO2) in each melt showed typical behavior, namely PO2 decreased as temperature decreased. Thissuggests that an oxidation of S4+ to S6+ took place. However, the PO2-value at constant temperature increased in the followingPO2 of the melt doped with sulfate+BFS was much lower than that ofthe melt with only sulfate, although only 10% of sulfur was added by the BFS. This behavior can be explained by the redox reac-tion between sulfide ions in the BFS and dissolved oxygen ions in the melt during the first fining.
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Plasma Display Panel용 기판 유리용융체의 내화물 침식
김기동,정현수,김효광,Kim, Ki-Dong,Jung, Hyun-Su,Kim, Hyo-Kwang 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.1
For self-developed alkali-alkaline earth-silicate and commercial glass melts for plasma display panel substrate, the corrosion behavior of fused casting refractory consisting of $Al_2O_3-ZrO_2-SiO_2$ was examined at the temperature corresponding to $10^2\;dPa{\cdot}s$ of melt viscosity by static finger methode. The corroded refractory specimens showed a typical concave shape due to interfacial convection of melts at their flux line. However, the corrosion thickness by commercial glass melts was $6\sim10$ times comparing to that by the self?developed melts. From the view point of the glass composition and the role of alkaline earth in glass network, it was discussed the effect of alkali/alkaline earth diffusion and temperature on the refractory corrosion.
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서로 다른 다가이온을 함유한 음극선관 전면유리 용융체의 Square Wave Voltammetry
김기동,김영호,김효광 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.6
With aids of square wave voltammetry (SWV) the redox behavior for various combination of polyvalent ions (Sb+Fe, Sb+Zn,Sb+Ce+Ti+Zn) was investigated in alkali-alkaline earth-silica CRT (Cathode Ray Tube) glass melts. The current-potential curve socalled voltamogram was produced at temperature range of 1400 to 1000oC under the scanned potential between 0 and 800 mVat 100 Hz. In the case of the Sb+Fe and Sb+Zn doped melts, peak for Sb3+/Sb0 shown voltammogram was shifted to negativedirection comparing to the only Sb doped melts. However, according to voltammogram of Sb+Ce+Ti+Zn doped melt, Ti and Ceexcept Zn had hardly any influence on the redox reaction of Sb. Based on the temperature dependence of the peak potential, standardenthalpy (H0) and standard entropy (S0) for the reduction of Fe3+ to Fe2+, Sb3+ to Sb0, Zn2+ to Zn0 and Ti2+ to Ti0 in each polyvalention combination of CRT glass melts were calculated.
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