Co‐Additions of TiO₂ and SiO₂ Crystalline Fillers to Tailor the Properties of BaO–ZnO–B₂O₃–SiO₂ Glass for Application to Barrier Ribs of Plasma Display Panels

Abstract

The influence of co-additions of crystalline TiO 2 and SiO 2 fillers (10 wt% addition in total) to BaO-ZnO-B 2 O 3 -SiO 2 glass on resultant properties was investigated from the viewpoint of applying the material to the barrier ribs of plasma display panels. The substitution of SiO 2 for TiO 2 reduced the dielectric constant significantly, while it maintained high optical reflectance and appropriate coefficient of thermal expansion (CTE) in the case when TiO 2 alone was used. A 5-7.5 wt% SiO 2 addition with 2.5-5 wt% TiO 2 under the constraint of 10 wt% total fillers demonstrated an optical reflectance of about 55%, a CTE of about 8.3 Â 10 À6 K À1 (compatible with glass panels), and a dielectric constant of about 7.5, which are promising properties for the barrier rib application.

Effects of Filler Size and Distribution on Viscous Behavior of Glass Composites

“…Although the dispersion behavior is quite good in the matrix with particle size lower than that of the glass, an excess amount of filler in the glass matrix creates agglomeration, which later on results in crystallization during firing in the sintering cycle. Viscosity increases with the decreasing of the filler particle size and with the increasing of the filler concentrations this is represented by the following equationwhere η 0 = absolute viscosity of the glass system, κ = 1/particle size, φ = particle packing density and φ max is the maximum fractional packing density of the filler particles in the dispersion.…”

Calcium Zinc Borosilicate Glass with High Thermal Expansion Coefficient for LTCC Applications

“…2, is the predicted results by using the effective CTE of each ingredient by Appen's constant () and by using Hormadaly's model 14 . The prediction by Appen's constants is qualitatively consistent with the experiment, although it significantly underestimates experiment like the cases for other glass compositions 6–10 . In this regard, the prediction by Hormadaly's model is more accurate on a quantitative base, which was also the case in an existing work 6 .…”

“…14 The prediction by Appen's constants is qualitatively consistent with the experiment, although it significantly underestimates experiment like the cases for other glass compositions. [6][7][8][9][10] In this regard, the prediction by Hormadaly's model is more accurate on a quantitative base, which was also the case in an existing work. 6 The underestimation of the CTE by the Appen's constants would be due to the fact that the constants were extracted from different glass compositions.…”

“…Therefore, the Appen constant of CTE is the effective CTE of an oxide when it is dissolved in glass network. The approach of tailoring the properties of glasses, based on and reported effective properties, was shown to be qualitatively valid in many existing works 6–10 . As the developed high CTE glass is aimed to be applied as a dielectric material, the dielectric constant of the glass has been also estimated and compared with the predicted value based on as reference data.…”

“…(1) and reported effective properties, was shown to be qualitatively valid in many existing works. [6][7][8][9][10] As the developed high CTE glass is aimed to be applied as a dielectric material, the dielectric constant of the glass has been also estimated and compared with the predicted value based on Eq. (1) as reference data.…”