Effect of particle size in slurry manufacturing for green sheet of lead-free transparent dielectrics
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The dispersion characteristics of the slurries according to the particle size (0.7 μm, 5 μm and 10 μm) of the lead(Pb)-free fritas a raw material were studied in order to aid in the manufacture of a green sheet for the transparent dielectric layers usingthe tape casting method. Effect of solvents and dispersants on the slurry formation was investigated by comparing thesedimentation height according to the particle size of the frit. Overall observations about precipitation and viscosity have beenperformed to establish the suitable manufacturing of slurry and the optimum working condition of the green sheet. When thepowder of lead-free transparent dielectric frit was dispersed in methyl alcohol, it was found that polyethylene glycol was themost suitable among several dispersants. Higher dispersion stability was shown at 2.0 wt% addition for a particle size of0.7 μm, 1.5 wt% for 5 μm, and 1 wt% for 10 μm, which can be explained by a steric stabilization mechanism. The smallerparticle size is more recommendable for dispersion based on steric stabilization, and increases the effective solid contact rateper unit volume, leading to a higher transmittance and voltage withstand property.
Abstract
The dispersion characteristics of the slurries according to the particle size (0.7 μm, 5 μm and 10 μm) of the lead(Pb)-free fritas a raw material were studied in order to aid in the manufacture of a green sheet for the transparent dielectric layers usingthe tape casting method. Effect of solvents and dispersants on the slurry formation was investigated by comparing thesedimentation height according to the particle size of the frit. Overall observations about precipitation and viscosity have beenperformed to establish the suitable manufacturing of slurry and the optimum working condition of the green sheet. When thepowder of lead-free transparent dielectric frit was dispersed in methyl alcohol, it was found that polyethylene glycol was themost suitable among several dispersants. Higher dispersion stability was shown at 2.0 wt% addition for a particle size of0.7 μm, 1.5 wt% for 5 μm, and 1 wt% for 10 μm, which can be explained by a steric stabilization mechanism. The smallerparticle size is more recommendable for dispersion based on steric stabilization, and increases the effective solid contact rateper unit volume, leading to a higher transmittance and voltage withstand property.
참고문헌 (16)
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