Method for manufacturing dielectric ceramic powder, and multilayer ceramic capacitor obtained by using the ceramic powder
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[0070] BaCO3 raw powder having a specific surface area of 20 m2 / g was prepared. Some of BaCO3 raw powder was dispersed into a mixed solution of distilled water and polyacrylic dispersant to manufacture BaCO3 slurry. BaCO3 raw powder was dispersed into the solution to such an extent that the BaCO3 slurry would contain 10 to 60 wt % BaCO3. The slurry was wet-milled for 18 hours via beads mill type equipment that uses zirconia beads with a diameter of 0.3 mm as milling media. During wet-milling, considering a sudden increase in viscosity in accordance with decrease in BaCO3 particle numbers, ammonia was added after 8 hour milling to reduce viscosity. A specific surface area of the wet-milled BaCO3 powder was 31 m2 / g, a significant increase from the initial one, and the particles had almost a spherical shape.
[0071] Field Emission (FE-SEM) picture before and after wet-milling BaCO3 is shown in FIG. 4(a-b). As shown in the aforesaid FIG. 4(a-b), wet-milling changed BaCO3 from acicular po...
example 2
[0075]
TABLE 1Specific surface areaWet-milling of(m2 / g)CalcinationNo.BaCO3BaCO3TiO2CaCO3temp. (° C.)1Not wet-milled202010202Not wet-milled202010403Wet-milled312010204Wet-milled312010405Wet-milled31459606Wet-milled31459907Wet-milled314510208Wet-milled3145309609Wet-milled314530990
[0076] BaCO3 raw powder having a specific surface area of 20 m2 / g was prepared. Some of BaCO3 raw powder was dispersed into a mixed solution of distilled water and polyarcrylic dispersant to produce BaCO3 slurry. BaCO3 powder was dispersed into the solution to such an extent that BaCO3 slurry would contain 10 to 60 wt % BaCO3. The resultant slurry was wet milled for 18 hours via beads mill type equipment using zirconia beads with a diameter of 0.3 mm as milling media. Considering a sudden increase in viscosity in accordance with decrease in BaCO3 particle numbers during a wet-milling process, ammonia was added to reduce viscosity after 8-hour milling. A specific surface area of the wet-milled BaCO3 powder is s...
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