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Dielectric ceramic composition
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A technology of dielectric ceramics and compositions, which is applied in the field of low-temperature co-fired dielectric ceramic compositions, and can solve problems such as high cost and economic defects
Inactive Publication Date: 2003-05-21
SAMSUNG ELECTRO MECHANICS CO LTD
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[0005] However, when Mo or W is used to make the internal electrode structure, it brings economic disadvantages due to its high cost
Method used
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Embodiment 1
[0046] According to the data in Table 1 below, according to the composition xBaO-y 1 Nd 2 o 3 -y 2 SM 2 o 3 -wBi 2 o 3 -zTiO 2 Weigh BaO and Nd with a purity of 99.0% or more 2 o 3 、Sm 2 o 3 、 Bi 2 o 3 and TiO 2 , and using a rod mill, the components were mixed in deionized water with 3Φ zirconia balls for 16 hours.
[0047] The slurry thus obtained was dried, coarsely ground in a mortar, heated to 1,150° C. at a heating rate of 5° C. / minute, and calcined at this temperature for 2 hours.
[0048] Subsequently, the calcined powder was pulverized first by grinding in a mortar and then using a planetary mill at 200 revolutions per minute (rpm) for 80 minutes. After combining with an adhesive, through a single-shaft compressor, using a 14mmΦ mold, at 2.0 tons / square centimeter (cm 2 ) pressure to mold the ground powder into a disc. The sample was sintered at 1,350°C for 3 hours, and its dielectric constant (K), Q value, TCF and sintered density were measured. The...
Embodiment 2
[0055] After the No. 7 and No. 8 compositions of Table 1 were roughly ground in a mortar, 4.0-12.0% by weight of glass powder was added to each 30g composition, and then 0-12.0% by weight of CuO was added, as shown in Table 3 below. Show.
[0056] The preparation method of glass powder is: weigh its components according to the composition in Table 2, melt each component at 1,200-1,400 ° C, quench in water, dry grind into coarse particles, and grind it in ethanol to size 0.5-1.0μm.
[0057] Next, the mixture was dried and calcined at 600-700° C. for 2 hours.
[0058] Subsequently, the calcined powder was ground first in a mortar and then in a planetary mill at 200 rpm for 30 minutes.
[0059] After combining with a binder, the ground powder was molded into a disc by a uniaxial compressor at a pressure of 2.0 t / cm2 using a mold of 14 mmΦ. The samples were sintered at 900 or 1,150°C for 3 hours, and their dielectric constant (K), Q value, TCF and sintered density were measured...
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Abstract
A dielectricceramic composition of high dielectric constant and low dielectric loss, which can be co-fired with Ag electrodes, is provided for use in various parts of electric and electronic appliances. The composition is represented by the following chemical formula:a wt. % {x BaO-y1 Nd2O3-y2 Sm2O3-w Bi2O3-z TiO2}+b wt. % (ZnO-B2O3-SiO2-PbO based glass frit)+c wt. % CuOwherein, 10.0 mol %<=x<=20.0 mol %; 7.0 mol %<=y1+y2<=20.0 mol %; 0.5 mol %<=w<=5.0 mol %; 60.0 mol %<=z<=80.0 mol %, with the proviso that x+y1+y2+w+z=100; 80.0 wt. %<=a<=98.0 wt. %; 1.0 wt. %<=b<=10.0 wt. %; 1.0 wt. %<=c<=10.0 wt. %.
Description
technical field [0001] The present invention relates to a dielectric ceramic composition widely used in high-frequency electronic components, more specifically, the present invention relates to a low-temperature co-fired dielectric ceramic composition with high dielectric constant and low dielectric loss. [0002] The low-temperature co-fired dielectric composition (material) refers to a composition (material) that can be fired at a temperature range of 800-950°C lower than the melting point of silver (Ag) or copper (Cu), which is different from that in Unlike conventional ceramic dielectrics sintered at 1,300°C or higher. Background technique [0003] In view of the recent trend of miniaturization, lightness, and modularization of high-frequency electronic devices, it is necessary to develop dielectric materials that can be multilayered and then co-fired with internal electrodes. [0004] In order to achieve multi-layering and co-firing with conventional dielectric materia...
Claims
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