KR19990075846A - Dielectric composition for ceramic capacitor and method of manufacturing same - Google Patents

Dielectric composition for ceramic capacitor and method of manufacturing same Download PDF

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KR19990075846A
KR19990075846A KR1019980010300A KR19980010300A KR19990075846A KR 19990075846 A KR19990075846 A KR 19990075846A KR 1019980010300 A KR1019980010300 A KR 1019980010300A KR 19980010300 A KR19980010300 A KR 19980010300A KR 19990075846 A KR19990075846 A KR 19990075846A
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dielectric
mol
ceramic capacitors
titanate
dielectric composition
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KR1019980010300A
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KR100259327B1 (en
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임성수
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김충환
한국전자 주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/018—Dielectrics
    • H01G4/06—Solid dielectrics
    • H01G4/08—Inorganic dielectrics
    • H01G4/12—Ceramic dielectrics
    • H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
    • H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
    • H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/018—Dielectrics
    • H01G4/06—Solid dielectrics
    • H01G4/08—Inorganic dielectrics
    • H01G4/12—Ceramic dielectrics
    • H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
    • H01G4/1254—Ceramic dielectrics characterised by the ceramic dielectric material based on niobium or tungsteen, tantalum oxides or niobates, tantalates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/465—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/472—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on lead titanates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • C04B35/475—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on bismuth titanates

Abstract

본 발명은 세라믹 콘덴서용 유전체 조성물 및 그 제조방법에 관한 것으로서, 티탄산스트론튬(SrTiO3), 티탄산납(PbTiO3), 티탄산마그네슘(MgTiO3), 산화비스무스티타늄(Bi2O3·3TiO3)을 주성분으로 하고 여기에 산화니오븀(Nb2O5) 및 탄산바륨(BaCO3)을 부성분으로 첨가하여 일정온도에서 소성하여 제조된 것으로, 이는 온도특성을 개선하고 유전율 및 유전손실 특성을 향상시켜 지금까지 전량 수입되고 있는 YD의 온도특성과 유전손실계수 0.5% 이하이며, 유전율이 2,000 이상인 전기적 특성을 갖는 세라믹 콘덴서용 유전체 조성물에 대한 수입대체 효과를 얻을 수 있다.The present invention is a ceramic as the capacitor dielectric composition and relates to a production method for, strontium titanate (SrTiO 3), lead titanate (PbTiO 3), magnesium titanate (MgTiO 3), bismuth oxide titanium (Bi 2 O 3 · 3TiO 3 ) It is manufactured by sintering at a certain temperature by adding niobium oxide (Nb 2 O 5 ) and barium carbonate (BaCO 3 ) as a main component, and improving the temperature characteristics and improving the dielectric constant and dielectric loss characteristics. It is possible to obtain an import substitution effect on the dielectric composition for ceramic capacitors, which has a temperature characteristic and a dielectric loss factor of 0.5% or less and a dielectric constant of 2,000 or more.

Description

세라믹 콘덴서용 유전체 조성물 및 그 제조방법Dielectric composition for ceramic capacitor and method of manufacturing same

본 발명은 세라믹 콘덴서용 유전체 조성물 및 그 제조방법에 관한 것으로서, 더욱 상세하게는 유전율, 온도특성 및 유전손실계수 등의 전기적 성능이 우수한 세라믹 콘덴서를 구성하는 유전체 조성물과 이를 제조하는 방법에 관한 것이다.The present invention relates to a dielectric composition for ceramic capacitors and a method of manufacturing the same, and more particularly, to a dielectric composition constituting a ceramic capacitor having excellent electrical performance such as dielectric constant, temperature characteristics, and dielectric loss coefficient, and a method of manufacturing the same.

세라믹 콘덴서는 비유전율(比誘電率)이 큰 산화티타늄의 자기를 유전체에 사용한 콘덴서이다.Ceramic capacitors are capacitors in which a magnet of titanium oxide having a large relative dielectric constant is used for a dielectric.

그 외형은 원반에 2개의 리드선이 한 방향으로 나와있는 형태이며, 내부는 자기원반을 사이에 두고 은(銀) 전극이 마주보고 있다.The outer shape is a form in which two lead wires are shown in one direction on a disk, and the inner side of the disk faces a silver electrode.

따라서, 세라믹 콘덴서는 매우 높은 주파수까지 사용할 수 있다.Thus, ceramic capacitors can be used up to very high frequencies.

소형인 것에 비하여 용량이 크며 1pF에서 1.5μF 정도의 범위의 것이 만들어지고 있다. 정격 사용전압은 저전압의 경우 DC 25∼50V, 중고압의 경우 AC 125, 250V, DC 500∼3kV 정도이다.Compared to the small size, the capacity is large and the range of 1pF to 1.5μF is being made. The rated operating voltage is about 25-50V DC for low voltage, about 125, 250V AC, 500 ~ 3kV AC for high voltage.

일반적으로 세라믹 콘덴서용 유전체 조성물은 유전율이 높은 티탄산바륨을 주성분으로 하고, 여기에 지르콘산바륨(BaZrO3), 탄산망간(MnCO3), 산화코발트(CoO), 산화세륨(CeO2) 등과 같은 첨가물을 혼합하여 유전체 세라믹을 소성하여 제조된다.In general, a dielectric composition for ceramic capacitors has a high dielectric constant of barium titanate, and additives such as barium zirconate (BaZrO 3 ), manganese carbonate (MnCO 3 ), cobalt oxide (CoO), and cerium oxide (CeO 2 ). It is prepared by firing the dielectric ceramic by mixing.

또 다른 세라믹 콘덴서용 유전체 조성물로는 고유전율계로서 티탄산바륨을 주성분으로 하고, 여기에 지르콘산칼슘(CaZrO3) 또는 안티몬산칼슘(CaSnO3)을 첨가한 복합세라믹 유전체도 널리 사용되어 왔다.As another dielectric composition for ceramic capacitors, a composite ceramic dielectric composed mainly of barium titanate as a high dielectric constant and added calcium zirconate (CaZrO 3 ) or calcium antimonate (CaSnO 3 ) has also been widely used.

그런데, 현재까지 국내 세라믹 콘덴서 제조업체에서 생산되고 있는 유전체 중 유전율이 2,000 이상이고, YD의 온도특성과 유전손실계수(tanδ)의 값이 0.5% 이하인 전기적 성능을 만족하는 유전체 원료는 일본 등에서 전량 수입되고 있다.However, dielectric materials satisfying the electrical performance of dielectrics produced by domestic ceramic capacitor manufacturers with more than 2,000 and YD's temperature characteristics and dielectric loss coefficient (tanδ) of 0.5% or less are all imported from Japan. have.

여기서, YD 온도특성이란 -25∼85℃의 온도범위에서 20℃기준으로 +20%, -30% 이하의 용량변화 범위를 만족하는 JIS규격을 의미한다.Here, the YD temperature characteristic means a JIS standard that satisfies a capacity change range of + 20% and -30% or less based on 20 ° C in a temperature range of -25 to 85 ° C.

본 발명은 상기와 같이 전량 수입에 의존하고 있는 세라믹 콘덴서용 자기 유전체 조성물을 유전율 2,000 이상이고, YD의 온도특성 및 유전손실계수 0.5% 이하인 전기적 성능을 만족하도록 조성하여 이를 국산화하는 동시에 국내외적으로 경쟁력 우위를 확보할 수 있도록 한 세라믹 콘덴서용 유전체 조성물을 제공하는 데 있다.The present invention provides a magnetic dielectric composition for ceramic capacitors, which is dependent on the total amount of import as described above, is localized at a dielectric constant of 2,000 or more, and satisfies the thermal performance of the YD and the electrical loss of 0.5% or less, and localizes it at the same time. The present invention provides a dielectric composition for ceramic capacitors that can secure an advantage.

본 발명의 또 다른 목적은 상기와 같은 온도특성과 전기적 성능을 만족하는 세라믹 유전체를 제조하는 방법을 제공하는 데 있다.Still another object of the present invention is to provide a method of manufacturing a ceramic dielectric that satisfies the above temperature characteristics and electrical performance.

상기와 같은 목적을 달성하기 위한 본 발명의 세라믹 콘덴서용 유전체 조성물은 티탄산스트론튬 59.8∼73.6 몰%, 티탄산납 13.8∼20.72 몰%, 티탄산마그네슘 2.64∼13.8 몰% 및 산화비스무스티타늄 4.6∼10.02 몰%로 이루어진 주성분 100중량부, 산화니오븀 0.1∼0.25 중량부 및 탄산바륨 0.1∼0.25 중량부로 이루어진 것에 그 특징이 있다.Dielectric composition for ceramic capacitors of the present invention for achieving the above object is 59.8-73.6 mol% of strontium titanate, 13.8-20.72 mol% of lead titanate, 2.64-13.8 mol% of magnesium titanate and 4.6-10.02 mol% of bismuthium oxide It is characterized by consisting of 100 parts by weight of the main component, 0.1 to 0.25 parts by weight of niobium oxide and 0.1 to 0.25 parts by weight of barium carbonate.

또한 본 발명은 상기와 같은 조성의 세라믹 콘덴서용 유전체 조성물을 습식혼합하고 건조 분쇄하는 공정, 950℃로 가소하는 공정, 가소된 유전체를 미분쇄하고 건조한 다음 바인더를 첨가하여 미분말로 제조하는 공정, 일축가압성형하여 성형체를 제조하는 공정, 및 1,200∼1,250℃로 3시간 동안 소성하는 공정을 포함하는 데 그 특징이 있다.In addition, the present invention is a process for wet mixing and drying and pulverizing the dielectric composition for ceramic capacitors of the above composition, the step of calcining at 950 ℃, the process of preparing the fine powder by pulverizing and drying the calcined dielectric and then adding a binder, uniaxial It is characterized by including a step of pressing and forming a molded article, and a step of baking for 3 hours at 1,200 ~ 1,250 ℃.

이와같은 본 발명을 더욱 상세하게 설명하면 다음과 같다.The present invention will be described in more detail as follows.

본 발명에 따른 세라믹 콘덴서용 유전체 조성물에 있어서 조성물에 있어서 주성분은 티탄산스트론튬인 바, 그 함량은 전체 세라믹 콘덴서의 유전체 조성물 중 59.8∼73.6몰%인 것이 바람직하다.In the dielectric composition for ceramic capacitors according to the present invention, the main component of the composition is strontium titanate, and its content is preferably 59.8 to 73.6 mol% in the dielectric composition of all ceramic capacitors.

만일, 티탄산스트론튬의 함량이 상기 범위를 벗어나면 유전율이 저하되거나 온도특성이 벗어나는 문제가 있다.If the content of strontium titanate is out of the above range, there is a problem that the dielectric constant is lowered or the temperature characteristic is deteriorated.

여기에, 티탄산납을 13.8∼20.72몰% 되도록 첨가하는 바, 이는 유전율 및 유전손실을 향상시키기 위해 첨가된다.Here, lead titanate is added so as to be 13.8 to 20.72 mol%, which is added to improve the dielectric constant and dielectric loss.

만일, 그 함량이 13.8 몰% 미만이면 유전율이 낮고, 20.72 몰%를 초과하여 첨가하면 유전손실이 증가하는 문제가 있다.If the content is less than 13.8 mol%, the dielectric constant is low, and if more than 20.72 mol% is added, there is a problem in that the dielectric loss increases.

그리고, 티탄산마그네슘은 온도특성을 안정화시키는 역할을 하는 것으로서, 그 함량은 주성분 중 2.64∼13.8 몰%인 것이 바람직하다.In addition, magnesium titanate plays a role of stabilizing temperature characteristics, and the content thereof is preferably 2.64 to 13.8 mol% in the main component.

만일, 티탄산마그네슘의 함량이 상기 범위를 벗어나면 유전율 및 온도특성에 악영향을 미칠 수 있다.If the content of magnesium titanate is out of the above range, it may adversely affect the dielectric constant and temperature characteristics.

또한, 본 발명에서 산화비스무스티타늄(Bi2O3·3TiO3)을 첨가하여 온도특성이 향상되도록 하는 바, 그 함량은 주성분 중 4.6∼10.02 몰%이다.In addition, in the present invention, by adding bismuthitanium oxide (Bi 2 O 3 · TiO 3 ) to improve the temperature characteristics, the content is 4.6-10.02 mol% of the main components.

산화비스무스티타늄은 산화비스무스(Bi2O3)와 산화티타늄(TiO2)을 1:3의 몰비로 일부치환하여 얻어지는 것으로서, 만일 산화비스무스티타늄의 함량이 상기 범위를 벗어나면 소결성이 나빠지거나 온도특성이 벗어나는 문제가 있다.Bismuth oxide is obtained by partially replacing bismuth oxide (Bi 2 O 3 ) and titanium oxide (TiO 2 ) in a molar ratio of 1: 3. If the content of bismuth oxide is out of the above range, the sintering property is deteriorated or the temperature characteristic is poor. There is a problem out of this.

이같은 주성분 100 중량부에 산화니오븀과 탄산바륨을 부성분으로 첨가할 수 있는 바, 그 함량은 산화니오븀은 0.1∼0.25 중량부이고, 탄산바륨의 경우 0.1∼0.25 중량부이다.Niobium oxide and barium carbonate can be added as a secondary component to 100 parts by weight of such a main component. The content is 0.1 to 0.25 parts by weight of niobium oxide and 0.1 to 0.25 parts by weight of barium carbonate.

이같은 부성분의 첨가는 온도특성, 유전율 및 유전손실계수 특성을 개선시키는 역할을 한다.The addition of such minor components serves to improve the temperature characteristics, permittivity and dielectric loss coefficient characteristics.

만일, 부성분의 함량이 상기 범위를 벗어나는 경우 소결온도, 유전율 및 유전손실계수 등의 향상이 어렵다.If the content of the minor component is out of the above range, it is difficult to improve the sintering temperature, dielectric constant and dielectric loss coefficient.

이와같은 유전체 조성물을 통해 유전체를 제조하는 방법은 상기와 같은 유전체 조성물을 습식혼합하고 건조 분쇄하고, 이를 950 ℃로 가소한다.The method for producing a dielectric through such a dielectric composition wet mixes and dry pulverizes such a dielectric composition and calcines it to 950 ° C.

가소된 유전체를 미분쇄하고 건조한 다음 바인더를 첨가하여 미분말로 제조하는 공정, 일축가압성형하여 성형체를 제조하고, 이를 1,200∼1,250℃에서 3시간 동안 소성하면 본 발명에 따른 유전체를 제조할 수 있다.A process of preparing a fine powder by pulverizing and drying the calcined dielectric and then adding a binder to produce a molded body by uniaxial pressure molding, and firing it at 1,200 to 1,250 ° C. for 3 hours can produce a dielectric according to the present invention.

만일, 이때 소성온도가 상기 범위를 벗어나면 미소결 또는 과잉 소결되는 문제가 발생될 우려가 있다.If the firing temperature is out of the above range, there is a concern that a problem such as fine grain or excessive sintering occurs.

이하, 본 발명을 실시예에 의거하여 상세히 설명하면 다음과 같은 바, 본 발명이 실시예에 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in detail with reference to the following Examples, but the present invention is not limited by the Examples.

실시예 1∼9Examples 1-9

다음 표 1에 나타낸 바와 같은 세라믹 콘덴서용 유전체 조성물을 볼밀에 넣어 습식혼합하였다. 그 다음 건조분쇄하고, 950℃에서 2시간 가소하고 가소된 유전체를 1.5∼2.0㎛ 되도록 미분쇄한 다음 건조한 후, 바인더를 전체 유전체 조성물 100중량부에 대하여 1.5 중량부 첨가혼합하여 과립을 제작하였다.Next, the dielectric composition for ceramic capacitors as shown in Table 1 was placed in a ball mill and wet mixed. Then, the mill was dried, calcined at 950 ° C. for 2 hours, the ground dielectric was ground to 1.5 to 2.0 μm, and then dried, and then the binder was mixed with 1.5 parts by weight based on 100 parts by weight of the total dielectric composition to prepare granules.

제작된 과립을 사용하여 1ton/㎠ 압력으로 일축가압성형하여 1.5Φ, 2.5mm 촌법으로 성형하였다.The produced granules were uniaxially press-molded at 1ton / ㎠ pressure and molded in 1.5Φ and 2.5mm millimeters.

성형한 후 1,200∼1,250℃로 3시간 소성하고 유전체 표면에 10∼20㎛ 두께로 은(Ag) 페이스트를 도포하여 전기적 특성을 측정하였으며, 그 결과를 표 2에 나타었다.After molding, the mixture was calcined at 1,200 to 1,250 ° C for 3 hours, and silver (Ag) paste was applied to the surface of the dielectric to have a thickness of 10 to 20 µm, and electrical properties thereof were measured.

주 성 분(몰%)Primary component (mol%) 부 성 분(중량부)Part (parts by weight) 티탄산스트론튬Strontium Titanate 티탄산납Lead titanate 티탄산마그네슘Magnesium titanate 산회비스무스티타늄Acid ash bismuthitanium 산화니오븀Niobium oxide 탄산바륨Barium carbonate 1One 59.8059.80 18.4018.40 13.8013.80 8.008.00 0.250.25 0.10.1 22 64.4064.40 18.4018.40 9.209.20 8.008.00 0.250.25 0.10.1 33 67.6267.62 18.7218.72 3.643.64 10.0210.02 0.10.1 0.10.1 44 68.6268.62 20.7220.72 2.642.64 8.028.02 0.10.1 0.250.25 55 68.6268.62 20.7220.72 3.643.64 7.027.02 0.10.1 0.250.25 66 69.0069.00 18.4018.40 8.008.00 4.604.60 0.250.25 0.250.25 77 70.6270.62 15.7215.72 3.643.64 10.0210.02 0.10.1 0.250.25 88 70.6270.62 18.7218.72 2.642.64 8.028.02 0.10.1 0.250.25 99 73.6073.60 13.8013.80 4.604.60 8.008.00 0.250.25 0.250.25

유전율permittivity tanδ(%)tanδ (%) 온도특성(%)Temperature characteristic (%) -25℃-25 ℃ 85℃85 ℃ 실시예Example 1One 22972297 0.100.10 1818 -27-27 22 22402240 0.080.08 1818 -28-28 33 22982298 0.100.10 1515 -25-25 44 30863086 0.170.17 1919 -27-27 55 30113011 0.170.17 1919 -26-26 66 20592059 0.050.05 1818 -27-27 77 20142014 0.030.03 1616 -24-24 88 26772677 0.130.13 1717 -28-28 99 27602760 0.380.38 1616 -26-26

상기 표 2의 결과로부터 본 발명의 함량범위를 만족하면서 티탄산스트론튬을 비롯하여 티탄산납, 티탄산마그네슘, 산화비스무스티타늄을 주성분으로 하고, 여기에 산화니오븀 등의 부성분을 첨가하여 제조된 유전체는 YD의 온도특성에 적합하고 유전율이 2,000 이상이며, 유전손실계수가 0.5%이하인 전기적 특성을 만족함을 알 수 있다.The dielectric material prepared by adding strontium titanate, lead titanate, magnesium titanate, bismuthitanium oxide as a main component, and adding a subcomponent such as niobium oxide to the content range of the present invention is satisfied from the results of Table 2 above. The dielectric constant is more than 2,000, and the dielectric loss coefficient satisfies the electrical characteristics of 0.5% or less.

이상에서 상세히 설명한 바와 같이, 본 발명에 따른 세라믹 콘덴서의 유전체 조성물은 지금까지 전량 수입되고 있는 YD의 온도 특성과 유전손실계수 등의 전기적 성능을 만족하는 유전체 원료를 대체할 수 있어 원가를 절감할 수 있고, 나아가서는 국제 경쟁력 강화 등의 효과를 얻을 수 있다.As described in detail above, the dielectric composition of the ceramic capacitor according to the present invention can replace the dielectric material that satisfies the electrical performance such as the temperature characteristics and dielectric loss coefficient of the YD imported so far can reduce the cost In addition, it can achieve the effect of strengthening international competitiveness.

Claims (3)

티탄산스트론튬 59.8∼73.6 몰%, 티탄산납 13.8∼20.72 몰%, 티탄산마그네슘 2.64∼13.8 몰% 및 산화비스무스티타늄 4.6∼10.02 몰%로 이루어진 주성분 100중량부, 산화니오븀 0.1∼0.25 중량부 및 탄산바륨 0.1∼0.25 중량부로 이루어진 세라믹 콘덴서용 유전체 조성물.100 parts by weight of main component consisting of 59.8 to 73.6 mol% of strontium titanate, 13.8 to 20.72 mol% of lead titanate, 2.64 to 13.8 mol% of magnesium titanate and 4.6 to 10.02 mol% of bismuth oxide, 0.1 to 0.25 parts by weight of niobium oxide and 0.1 barium carbonate A dielectric composition for ceramic capacitors consisting of -0.25 parts by weight. 제 1 항의 세라믹 콘덴서용 유전체 조성물을 습식혼합하고 건조 분쇄하는 공정,Wet mixing and dry grinding the dielectric composition for ceramic capacitors of claim 1, 950℃로 가소하는 공정,Calcining at 950 ° C, 가소된 유전체를 미분쇄하고 건조한 다음 바인더를 첨가하여 미분말로 제조하는 공정,Finely pulverizing the calcined dielectric and drying it to make a fine powder by adding a binder, 일축가압성형하여 성형체를 제조하는 공정, 및Uniaxial pressure molding to produce a molded article, and 1,200∼1,250℃로 3시간 동안 소성하는 공정을 포함하는 세라믹 콘덴서용 유전체의 제조방법.A method for producing a dielectric for ceramic capacitors comprising the step of baking at 1,200 to 1,250 ° C. for 3 hours. 제 2 항에 있어서, 상기 세라믹 콘덴서용 유전체는 유전율이 2,000 이상이고, YD의 온도특성을 만족시키며, 유전손실계수 0.5% 이하 되도록 제조된 것을 특징으로 하는 세라믹 콘덴서용 유전체의 제조방법.The method of claim 2, wherein the dielectric for ceramic capacitors has a dielectric constant of 2,000 or more, satisfies the temperature characteristic of YD, and is manufactured to have a dielectric loss factor of 0.5% or less.
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