KR940005991B1 - Dielectric material - Google Patents

Dielectric material Download PDF

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KR940005991B1
KR940005991B1 KR1019920001942A KR920001942A KR940005991B1 KR 940005991 B1 KR940005991 B1 KR 940005991B1 KR 1019920001942 A KR1019920001942 A KR 1019920001942A KR 920001942 A KR920001942 A KR 920001942A KR 940005991 B1 KR940005991 B1 KR 940005991B1
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dielectric
composition
capacitor
temperature compensation
mgtio
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KR1019920001942A
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Korean (ko)
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KR930018605A (en
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구자권
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삼화콘덴서공업 주식회사
김태화
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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

Abstract

The ceramic condenser comprising a dielectric ceramic and electrods is characterized in that the composition of ceramic condenser comprises CaTiO3 42.13 wt.%, MgTiO3 27.48 wt.%, Bi2(TiO3)3 17.36 wt.%, Nd2O3 11.06-11.20 wt.%, La2O3 1.15 wt.%, ZrO2 0.36-0.51 wt.%, SiO2 0.16-0.17 wt.% and MnCO3 0.15-0.14 wt.%.

Description

원판형 고정 자기콘덴서의 유전체 조성물Dielectric Composition of Disk-shaped Fixed Magnetic Capacitor

본 발명은 유전체 자기와 100% Ag 전극을 사용하여 제조되는 자기콘덴서의 조성물에 관한 것으로, 특히 온도보상용으로 사용되는 원판형 고정 자기 콘덴서에 관한 것이다.The present invention relates to a composition of a magnetic capacitor manufactured using a dielectric porcelain and a 100% Ag electrode, and more particularly to a disk-shaped fixed magnetic capacitor used for temperature compensation.

일반적으로 온도보상용 자기 콘덴서는 산화티타늄을 주성분으로 하는 세라믹 유전체를 1200℃ 이상의 고온에서 소성한 후 전극을 도포하여 제조되는 것으로 이는 전자기기의 공진회로나 품질계수(Q) 값이 높고 온도에 대하여 정전용량의 안정성이 중요한 회로에 사용되어 진다. 즉 이러한 온도보상용 자기콘덴서는 자기 유전체에 온도를 변화시키면 정전 용량도 이에 따라 변화하게 되는데 이때 변화되는 양을 계수로 표기하며 콘덴서의 정전용량과 인덕터(Inductor)가 서로 조합되어 LC 공진회로의 주파수가 온도에 따라 변화되지 않도록 보상해 주는 역할을 하게 된다.Generally, a magnetic capacitor for temperature compensation is manufactured by firing a ceramic dielectric mainly composed of titanium oxide at a high temperature of 1200 ° C. or higher, and then applying an electrode. Capacitive stability is used in critical circuits. That is, the temperature compensation magnetic capacitor changes the capacitance according to the change in the temperature of the magnetic dielectric. The amount of change is expressed as a coefficient. To compensate for not changing with temperature.

본 발명은 이러한 온도보상용 고정자기 콘덴서 중에서 -25℃~+85℃의 사용 온도 범위에서 온도계수가 -220±60ppm/℃인 PH 특성을 갖는 원판형 고정 자기콘덴서의 유전체 자기 조성물 및 그에 따른 자기 콘덴서의 제조방법을 제공하고자 하는 것이다.The present invention provides a dielectric ceramic composition of a disk-shaped fixed magnetic capacitor having a PH characteristic of a temperature coefficient of -220 ± 60ppm / ° C in a temperature range of -25 ° C to + 85 ° C, and a magnetic capacitor thereof. It is to provide a method of manufacturing.

즉, 본 발명에 따라 유전상수 80±8, PH(-220±60ppm/℃) 특성의 세라믹 콘덴서용 유전체 조성물을 제조하기 위해서 조성원료인 CaTiO3, MgTiO3, Bi2(TiO3)3, ZrO2, Nd2O3, SiO2, MnCO3를 각각 중량비로 구성하여 볼밀기로 습식혼합을 시행한 건조, 분쇄하여 성형한 후 전기로에서 종래의 자기콘덴서 제조공정에 따라 소성시킨다. 이후 소결된 시편을 100% Ag 전극을 도포하고 전극은소를 하여 납땜후 완제품으로 하고, 이들의 전기적 특성을 측정한다. 이때 측정항목 및 방법은 용량, 손실, Q값은 4220A Test chamber(Saunder 사) 및 4194A Impedence/Gain-phase Analyzer, 절연저항(IR)은 SM-10E ultra MΩ Meter 등을 사용하며, SEM을 통하여 소결된 시료의 표면 및 단면을 관찰한다.That is, according to the present invention, in order to prepare a dielectric composition for ceramic capacitors having a dielectric constant of 80 ± 8 and PH (-220 ± 60ppm / ° C), CaTiO 3 , MgTiO 3 , Bi 2 (TiO 3 ) 3 , and ZrO 2 , Nd 2 O 3 , SiO 2 , and MnCO 3 are respectively weighted, dried, pulverized, wet-mixed with a ball mill, and then fired according to the conventional magnetic capacitor manufacturing process in an electric furnace. Then, the sintered specimen is coated with 100% Ag electrode, the electrode is sintered to be a finished product after soldering, and their electrical characteristics are measured. At this time, the measurement items and methods use capacity, loss, Q value of 4220A Test chamber (Saunder) and 4194A Impedence / Gain-phase Analyzer, and insulation resistance (IR) such as SM-10E ultra MΩ meter. The surface and the cross section of the prepared sample.

본 발명에서의 세라믹 유전체 조성물은, 온도 보상용 자기 콘덴서의 기본 물질로 사용되는 페로브스카이트(perovskite) 구조의 CaTiO3를 주성분으로 42.13w/o(중량%, 즉 Weight %를 의미한다), 부성분으로는 전체에 대해 27.48w/o의 MgTiO3, 11.06~11.20w/o 까지의 Nd2O3를 포함하고 여기에 온도특성 및 소결성을 개선하기 위해 Bi2(TiO3)3, ZrO2, La2O3, SiO2를 각각 17.36w/o, 0.36~0.51w/o, 1.15w/o, 0.16w/o~0.17w/o를 포함하며 발색원료 및 절연성 물질인 MnCO3를 0.15w/o의 범위에서 조성된다.In the present invention, the ceramic dielectric composition is composed of CaTiO 3 having a perovskite structure, which is used as a base material of the magnetic capacitor for temperature compensation, as a main component of 42.13 w / o (weight%, that is, weight%), The minor constituents include 27.48 w / o MgTiO 3 and Nd 2 O 3 from 11.06 to 11.20 w / o with respect to the total, and include Bi 2 (TiO 3 ) 3 , ZrO 2 , La 2 o 3, a SiO 2 respectively 17.36w / o, 0.36 ~ 0.51w / o, 1.15w / o, 0.16w / o ~ include 0.17w / o 0.15w and the MnCO 3 in color-developing material and the insulating material / It is formed in the range of o.

본 발명의 제조 공정흐름도를 간략하게 요약하면 다음과 같다.Briefly summarized the manufacturing flow chart of the present invention is as follows.

1) 원료 평량(weighing), 2) 뱃지(batch), 3) 볼밀링(ball milling), 4) 건조(drying), 5) 분쇄(grinding), 6) 체질(sieving, 7) 가압성형(pressing), 8) 소성(sintering), 9) 전극인쇄(electrode printing), 10) 전극은소(electrode sintering), 11) 납땜(soldering), 12) 완제품(products), 13) 실험(testing).1) Weighing of raw materials, 2) Batch, 3) Ball milling, 4) Drying, 5) Grinding, 6) Sieving, 7) Pressing ), 8) sintering, 9) electrode printing, 10) electrode sintering, 11) soldering, 12) products, 13) testing.

본 발명에 따라 상기와 같은 조성물 및 방법으로 제조된 세라믹 자기 유전체 콘덴서는 "RH" 특성을 나타내는 동시에 제반 전기적 특성이 종래의 온도보상용 자기콘덴서에 비해 조금도 뒤떨어지지 않고 원가절감효과가 있기 때문에 본 발명의 유전체 조성물에 의한 우수한 특성의 원판형 고정 자기콘덴서를 제공할 수 있다는 특장점이 있는 것이다.According to the present invention, the ceramic magnetic dielectric capacitor manufactured by the composition and method as described above exhibits "RH" characteristics and at the same time the electrical characteristics thereof are inferior to conventional temperature compensation magnetic capacitors and have a cost reduction effect. There is a merit that it is possible to provide a disk-shaped fixed magnetic capacitor having excellent characteristics by the dielectric composition of the present invention.

본 발명의 세라믹 유전체 조성물로부터 제조된 자기 콘덴서의 특성을 하기 표 1에 나타내었다.The characteristics of the magnetic capacitor prepared from the ceramic dielectric composition of the present invention are shown in Table 1 below.

[표 1]TABLE 1

이하 본 발명에서의 구체적 실시예를 기재한다.Hereinafter, specific examples in the present invention will be described.

[실시예 1]Example 1

a) 조성(w/o)a) composition (w / o)

CaTiO342.13 La2O31.15CaTiO 3 42.13 La 2 O 3 1.15

MgTiO327.48 ZrO20.51MgTiO 3 27.48 ZrO 2 0.51

Bi2(TiO3)317.36 SiO20.16Bi 2 (TiO 3 ) 3 17.36 SiO 2 0.16

Nd2O311.06 MnCO30.15Nd 2 O 3 11.06 MnCO 3 0.15

b) 자기 콘덴서 제조b) magnetic capacitor manufacturing

상기의 세라믹 유전체 조성물 각각을 칭량한 원료 조성물 100g을 물 60ml, 바인더(폴리비닐알콜 10%) 30ml과 혼합후, 볼밀로 습식 혼합, 분쇄한 다음, 100℃에서 5시간동안 건조후 80-230mesh 입자크기를 갖도록 한후 3톤의 압력으로 가압하여 11ø, 성형밀도 2.5-3.0을 갖는 성형체를 제조하고, 전기로에서 1340℃-1380℃의 소성조건으로 일반적인 세라믹 유전체 소성공정에 따라 소성한다. 소결된 세라믹 유전체에 100% Ag 페이스트(paste)를 스크린 인쇄(Screen Printing) 한후 전극표면을 800℃×15분의 조건으로 은소한후 납땜하여 완제품으로 하고, 전기한 바와 같은 시험기기를 통하여 제반특성 및 미세구조(Microstructure)를 검사하여 표 2에 기재하였다.100 g of the raw material composition weighing each of the ceramic dielectric compositions was mixed with 60 ml of water and 30 ml of a binder (polyvinyl alcohol 10%), wet-mixed and pulverized with a ball mill, dried at 100 ° C. for 5 hours, and then 80-230mesh particles After having a size, it is pressurized to a pressure of 3 tons to prepare a molded article having 11 ° and a molding density of 2.5-3.0, and then fired according to a general ceramic dielectric firing process under a firing condition of 1340 ° C.-1380 ° C. in an electric furnace. After screen printing 100% Ag paste on the sintered ceramic dielectric, the surface of the electrode is annealed at 800 ℃ × 15 minutes and then soldered to make a finished product. And the microstructure (Inspection) was listed in Table 2.

[실시예 2]Example 2

a) 조성(w/o)a) composition (w / o)

CaTiO342.13 La2O31.15CaTiO 3 42.13 La 2 O 3 1.15

MgTiO327.48 ZrO20.36MgTiO 3 27.48 ZrO 2 0.36

Bi2(TiO3)317.36 SiO20.17Bi 2 (TiO 3 ) 3 17.36 SiO 2 0.17

Nd2O311.20 MnCO30.15Nd 2 O 3 11.20 MnCO 3 0.15

b) 자기 콘덴서 제조b) magnetic capacitor manufacturing

상기 조성 비율에 따라 실시예 1과 동일한 방법으로 제조하였으며 측정 방법 또한 동일하다.According to the composition ratio was prepared in the same manner as in Example 1 and the measurement method is also the same.

상기 실시예에 따라 제조된 유전체 조성물에 따른 특성을 종합하여 하기 표 2에 기재하였다.Table 2 summarizes the characteristics of the dielectric composition prepared according to the embodiment.

[표 2]TABLE 2

실시예 1-2에서 볼 수 있듯이 본 유전체 자기 콘덴서 조성물에 대한 발명은 양호한 특성을 가지게 되어 제조원가면이나 콘덴서로서의 제조시 높은 신뢰성을 얻을 수 있게 되어, 본 발명은 온도보상용 원판형 고정 자기콘덴서의 제조에 있어 유용한 발명이라 할 수 있다.As can be seen from Examples 1-2, the present invention has a good characteristic and can obtain high reliability when manufacturing as a production cost or a capacitor, and the present invention provides a disc-shaped fixed magnetic capacitor for temperature compensation. The invention can be said to be useful in the manufacture.

Claims (2)

유전체 자기와 전극으로 구성된 세라믹 콘덴서의 조성물에 있어서, CaTiO342.13w/o, MgTiO327.48w/o, Bi2(TiO3)317.36w/o, Nd2O311.06~11.20w/o, La2O31.15w/o, ZrO20.36~0.51w/o, SiO20.16~0.17w/o, MnCO30.15w/o로 구성됨을 특징으로 하는 온도 보상용 원판형 고정자기 콘덴서의 유전체 조성물.In the composition of a ceramic capacitor composed of a dielectric porcelain and an electrode, CaTiO 3 42.13w / o, MgTiO 3 27.48w / o, Bi 2 (TiO 3 ) 3 17.36w / o, Nd 2 O 3 11.06-11.20w / o, Dielectric composition of a disc-shaped stator capacitor for temperature compensation, comprising La 2 O 3 1.15 w / o, ZrO 2 0.36 to 0.51 w / o, SiO 2 0.16 to 0.17 w / o, and MnCO 3 0.15 w / o . CaTiO342.13w/o, MgTiO327.48w/o, Bi2(TiO3)317.36w/o, Nd2O311.06~11.20w/o, La2O31.15w/o, ZrO20.36~0.51w/o, SiO20.16~0.17w/o, MnCO30.15w/o로 구성된 유전체 조성물을 습식 혼합하고 건조, 분쇄한후 가압하여 성형체를 제조하고, 전기로에서 1340℃~1380℃의 소성조건으로 소성하고, 소결된 유전체에 100% Ag 페이스트를 스크린 인쇄한 후 전극표면을 은소하고 납땜함을 특징으로 하는 온도보상용 원판형 고정 자기콘덴서의 제조방법.CaTiO 3 42.13w / o, MgTiO 3 27.48w / o, Bi 2 (TiO 3 ) 3 17.36w / o, Nd 2 O 3 11.06 ~ 11.20w / o, La 2 O 3 1.15w / o, ZrO 2 0.36 ~ Dielectric composition consisting of 0.51w / o, SiO 2 0.16 ~ 0.17w / o, MnCO 3 0.15w / o is wet mixed, dried, pulverized and pressurized to produce a molded body, and the firing conditions of 1340 ℃ ~ 1380 ℃ in an electric furnace A method of manufacturing a disk-shaped fixed magnetic capacitor for temperature compensation, comprising: firing with a paste, screen printing 100% Ag paste on the sintered dielectric, and then soldering and soldering the electrode surface.
KR1019920001942A 1992-02-11 1992-02-11 Dielectric material KR940005991B1 (en)

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