A large-size high-electric strength titanium oxide-based dielectric ceramic material and its preparation method and application
A technology of dielectric ceramics and electric strength, applied in the direction of titanium dioxide, titanium oxide/hydroxide, fixed capacitor dielectric, etc., can solve the problems of low energy storage density, poor stability of dielectric and mechanical properties, and low electric strength , to achieve the effect of simple preparation process and good frequency stability
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Embodiment 1
[0044] By 25mol% CaTiO 3 +61mol%TiO 2 +8mol%Al 2 TiO 5 +6mol% SiO 2 Formulation Weighing CaCO 3 、TiO 2 , SiO 2 and Al 2 o 3 The raw materials for each composition were wet-milled for 12 hours with water as the medium and agate balls as the grinding medium, then discharged and dried, and the obtained powder was pre-calcined at 1100° C. for 4 hours. Carry out wet ball milling again, obtain the mixed powder that particle size is 0.02~4 μm after drying; Add weight to the mixed powder 0.8% polyvinyl alcohol (PVA) of mixed powder gross weight and carry out spray granulation, then Press the green body under the isostatic pressure of 200MPa; sinter the green body at 1250°C for 20 hours, and then cool it to room temperature naturally to obtain the ceramic block; cut and finely grind the obtained ceramic block to obtain the diameter 6mm×thickness 3mm and diameter 30mm×thickness 0.1 ~ 1mm cylindrical ceramic piece, length 300mm×width 15mm×thickness 3mm cuboid ceramic piece, the ...
Embodiment 2
[0049] By 22mol% CaTiO 3 +76.8mol%TiO 2 +0.2mol%SrTiO 3 +0.5mol%Al 2 TiO 5 +0.5mol% SiO 2 Formulation Weighing CaCO 3 , SrCO 3 、TiO 2 , SiO 2 and Al 2 o 3 Each composition raw material, using water as the medium and agate ball as the grinding medium, after wet ball milling for 24 hours, discharging and drying, pre-calcining the obtained powder at 1100°C for 4 hours; performing wet ball milling again, and drying to obtain Mixed powder with a particle size of 0.2-2 μm; add 0.5% polyvinyl alcohol (PVA) whose weight is the total weight of the mixed powder to the obtained mixed powder for spray granulation, and then press under an isostatic pressure of 200 MPa to produce Blank; sinter the resulting green body at 1310°C for 6h, and then cool naturally to room temperature to obtain a ceramic block.
[0050] Figure 10 Be the dielectric spectrum figure of the ceramic standard sheet (diameter 30mm, thick 1mm) in the present embodiment, by Figure 10 It can be seen that the...
Embodiment 3
[0052] By 29mol% CaTiO 3 +41mol%TiO 2 +12mol%Al 2 TiO 5 +18mol% SiO 2 Formulation Weighing CaCO 3 、TiO 2 , SiO 2 and Al 2 o 3 Each composition raw material, using water as the medium and agate ball as the grinding medium, after wet ball milling for 24 hours, discharging and drying, pre-calcining the obtained powder at 1100°C for 4 hours; performing wet ball milling again, and drying to obtain A mixed powder with a particle size of 0.2-2 μm; adding 0.8% polyvinyl alcohol (PVA) with a weight equal to the total weight of the mixed powder to the obtained mixed powder for spray granulation, and then pressing under an isostatic pressure of 200 MPa to produce Blank; sinter the resulting green body at 1220°C for 24 hours, and then cool naturally to room temperature to obtain a ceramic block.
[0053] Figure 11 Be the dielectric spectrum figure of the ceramic standard sheet (diameter 30mm, thick 1mm) in the present embodiment, by Figure 11 It can be seen that the dielectri...
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