Method for making raw dielectric ceramic powder, dielectric ceramic and monolithic ceramic capacitor
A technology of dielectric ceramics and manufacturing methods, applied in the field of manufacturing thin layers of dielectric ceramics that can realize laminated ceramic capacitors, and raw material powders for dielectric ceramics, which can solve problems such as difficulty in uniform reaction
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Embodiment 1
[0049] As a starting material, the polyvinyl butyral-based organic polymer compound with a molecular weight of about 21,000 adsorbed by 0.8% by weight was weighed, and the specific surface area was 18 m 2 / g BaCO 3 powder, and a specific surface area of 20m 2 / g TiO 2 powder such that the Ba / Ti molar ratio was 1.000, and these were then wet mixed. Next, the mixed powder was dried, and calcined at 1100° C. for 2 hours in a batch furnace. Finally, the obtained calcined product was pulverized with a dry pulverizer to obtain a raw material powder for barium titanate-based dielectric ceramics.
Embodiment 2
[0053] As a starting material, the polycarboxylate ammonium salt-based organic polymer compound with a molecular weight of about 10,000 adsorbed by 1.3% by weight was weighed, and the specific surface area was 12 m 2 / g BaCO 3 powder, and a specific surface area of 10m 2 / g TiO 2 powder such that the Ba / Ti molar ratio was 1.000, and these were then wet mixed. Next, the mixed powder was dried, and calcined at 1100° C. for 2 hours in a batch furnace. Finally, the obtained calcined product was pulverized with a dry pulverizer to obtain a raw material powder for barium titanate-based dielectric ceramics.
Embodiment 3
[0057] As a starting material, the styrene-maleic anhydride copolymerized polymer surfactant with a molecular weight of about 15,000 adsorbed by 1% by weight was weighed, and the specific surface area was 25 m 2 / g BaCO 3 The powder is also adsorbed 1% by weight of styrene-maleic anhydride copolymerized polymer surfactant, and the specific surface area is 30m 2 / g CaCO 3 powder, and a specific surface area of 15m 2 / g TiO 2 powder, so that their molar ratio is (Ba 0.95 Ca 0.05 ) 1.000 TiO 3 , and these are then wet mixed. Next, the mixed powder was dried, and calcined at 1100° C. for 2 hours in a batch furnace. Finally, the obtained calcined product was pulverized with a dry pulverizer to obtain a Ca-modified barium titanate-based raw material powder for dielectric ceramics.
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