| 摘要 |
PURPOSE: Provided is a preparation method of dielectric ceramics with ultrafine particles and high density at low temperature by adding CuO and rare earth metal oxide to BaTiO3, and sintering in O2 atmosphere. CONSTITUTION: Ultrafine dielectric ceramics are prepared by the following steps: wet ball-milling powders of raw materials, BaTiO3, CuO and RE3O3, for a slurry of BaTiO3 + xCuO + yRE2O3, where 0.00<x<=0.05, 0.00<y<=0.05, and RE is at least one rare earth element selected from the group consisting of La, Pr, Nd, Sm, Eu, Gd, Tb, Ho, Er and Yb; calcining at 900-1100deg.C for 0.5-2hrs. in air atmosphere; forming; sintering by heating at 360deg.C/hr to 1100deg.C in O2 atmosphere. The flow of O2 gas is over 1.1times(per min.) and preferably over 3.2times(per min,) of the volume of furnace. The resultant dielectric ceramics have 90-100nm of particle size and 5.2-5.8g/cm¬3 of density.
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