Composite dielectric material and substrate
A dielectric material and dielectric technology, applied in the direction of circuit substrate materials, non-homogeneous insulating materials, circuits, etc., can solve problems such as the decrease of resistivity, and achieve the effect of improving filling.
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no. 1 Embodiment
[0129] Experiments conducted to study suitable additives for dielectric ceramic powders are shown as a first experimental example.
[0130] (first embodiment)
[0131] As the starting raw material powder, prepare a total of 1.5 kg of BaCO 3 、TiO 2 and Nd 2 o 3 The powder is mixed in pure water to make a slurry with a concentration of 60%. To 2.5 kg of the slurry, 30 cc of a dispersant (product name: A-30SL (10% solution) manufactured by Toagosei Co., Ltd.) was added, and mixed at 85 rpm for 16 hours with a ball mill. Next, after the mixed material was dried for 24 hours, it was pre-fired in air at 1225° C. for 2 hours to obtain a dielectric ceramic material. The dielectric ceramic material is made into a slurry with a concentration of 60% with water, and finely pulverized by a ball mill to an average particle size of 0.4-1.5 μm. Then, it was dried to obtain dielectric ceramic powder. Add 0.025 to 0.2% by weight of MnCO to the powder 3 As an additive, water was added at...
no. 2 experiment example
[0163] Using MnCO 3 When it is used as an additive, an experiment conducted to confirm a preferable addition amount is shown as a second example.
[0164] Make MnCO separately 3 The addition amount was set to 0.025 wt%, 0.05 wt%, 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.3 wt%, and 1.0 wt% of the dielectric ceramic powder. Then, add MnCO 3 The time selection and annealing conditions were set as follows, and the composite dielectric material was produced under the same conditions as in the first embodiment except that. And the composition of the dielectric ceramic powder was analyzed, and the results confirmed that the composite dielectric material produced contained BaO, Nd 2 o 3 、TiO 2 , and MnO.
[0165] 3 time selection>
[0166] Add in the mixing and drying process (step S103).
[0167]
[0168] It was fired at 1100° C. for 4 hours in the atmosphere.
[0169] The electrical resistivities of the seven composite dielectric materials were measured in the same manner as above. ...
no. 3 experiment example
[0185] An experiment conducted to confirm the relationship between the specific surface area and resistivity of the dielectric ceramic powder is shown as a third experiment example.
[0186] The raw material powders were prepared to have the compositions shown in FIG. 13 to produce 17 kinds of dielectric ceramic powders. Next, resins were mixed with the respective dielectric ceramic powders to obtain 17 kinds of composite dielectric materials. For sample No.14 and sample No.17 shown in Figure 13, MnCO was added after pulverization 3 and Bi 2 o 3 as an additive.
[0187] The resistivity of the composite dielectric material thus obtained was measured. Fig. 14 shows the relationship between specific surface area and resistivity.
[0188] As shown in FIG. 14 , for samples containing no MnO after firing (indicated as “Mn-free” in FIG. 14 ), the resistivity tends to decrease as the specific surface area decreases. On the contrary, for the samples containing MnO after firing (i...
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