KR0161219B1 - High frequency dielectric ceramic composition for ceramic condenser - Google Patents
High frequency dielectric ceramic composition for ceramic condenserInfo
- Publication number
- KR0161219B1 KR0161219B1 KR1019960038868A KR19960038868A KR0161219B1 KR 0161219 B1 KR0161219 B1 KR 0161219B1 KR 1019960038868 A KR1019960038868 A KR 1019960038868A KR 19960038868 A KR19960038868 A KR 19960038868A KR 0161219 B1 KR0161219 B1 KR 0161219B1
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- Prior art keywords
- dielectric
- composition
- ceramic capacitor
- frequency
- tio
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- 239000000203 mixture Substances 0.000 title claims abstract description 37
- 239000000919 ceramic Substances 0.000 title claims 4
- 239000003985 ceramic capacitor Substances 0.000 claims abstract description 20
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 12
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims abstract description 9
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 claims abstract description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 6
- -1 B 2 O 3 Inorganic materials 0.000 claims abstract description 3
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 description 12
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 4
- 239000002003 electrode paste Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Inorganic materials [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Inorganic Insulating Materials (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
본 발명은 고주파 대용량 세라믹 콘덴서용 유전체 조성물에 관한 것으로 더 상세히 설명하면 CaTiO3재료를 주성분으로 하고 La2O3, Nd2O3, PbO, B2O3, SiO2, Al2O3, TiO2및 MgO 성분들을 포함하며, 각각의 성분들은 Wt%로The present invention relates to a dielectric composition for a high-frequency, large-capacity ceramic capacitor, and more particularly, to a dielectric composition for a high-frequency, large-capacity ceramic capacitor which comprises CaTiO 3 as a main component and La 2 O 3 , Nd 2 O 3 , PbO, B 2 O 3 , SiO 2 , Al 2 O 3 , TiO 2 and MgO components, each of which comprises Wt%
CaTiO3: 60~68%, TiO2: 7~12%, MgO : 1~3%CaTiO 3 : 60 to 68%, TiO 2 : 7 to 12%, MgO: 1 to 3%
La2O3: 2~6%, Nd2O3: 2~6%, PbO : 1~3%La 2 O 3 : 2 to 6%, Nd 2 O 3 : 2 to 6%, PbO: 1 to 3%
Al2O3: 1~4%, SiO2: 2~6%, B2O3: 3~8%Al 2 O 3 : 1 to 4%, SiO 2 : 2 to 6%, B 2 O 3 : 3 to 8%
의 범위를 갖는 조성 비율로 구성되어 있으며 이들 성분의 합은 100wt%로서, 이것에 중량비로 ZrO21~5% 첨가한 것을 특징으로 한 고주파 대용량 세라믹 콘덴서용 유전체 조성물에 관한 것이다., And the sum of these components is 100 wt%, and 1 to 5% of ZrO 2 is added thereto in a weight ratio. The present invention also relates to a dielectric composition for a high-frequency large-capacity ceramic capacitor.
Description
고주파 대용량 세라믹 콘덴서용 유전체 조성물은 고주파 영역(1kHz~500kHz)에서 충분한 정전 용량을 만족시키기 위해서는 유전체 조성물의 유전율이 10 이상 되어야 하며 유전 손실 및 재료의 절연 파괴를 방지하기 위해서는 0.2% 이하의 손실 계수를 가져야 한다.In order to satisfy a sufficient electrostatic capacity in a high frequency range (1 kHz to 500 kHz), a dielectric composition of a high-frequency large-capacity ceramic capacitor should have a dielectric constant of 10 or more and a loss coefficient of 0.2% or less in order to prevent dielectric loss and dielectric breakdown of the material Should have.
세라믹 콘덴서의 특성과 관련, 유전체 조성물의 유전율을 크게 하면 정전 용량은 증가될 수 있으나 유전 손실 및 온도 계수가 증가되고, 유전 손실은 세라믹 콘덴서에서 발생되는 에너지 손실과 고주파 영역에서 절연 파괴에 직접적인 영향을 미치기 때문에 유전 손실이 작을수록 좋으므로 유전체 조성물을 제조할 때는 이러한 점 등을 고려하여 유전체 재료를 선정할 필요가 있다.Increasing the dielectric constant of the dielectric composition with respect to the characteristics of the ceramic capacitor increases the capacitance but increases the dielectric loss and the temperature coefficient. The dielectric loss directly affects the energy loss in the ceramic capacitor and the dielectric breakdown in the high frequency range. The smaller the dielectric loss is, the better the dielectric material needs to be selected in consideration of these points when manufacturing the dielectric composition.
현재 세라믹 콘덴서 유전체 재료로는 BaTiO3및 산화티탄계 재료가 주원료로 많이 이용되고 있다. BaTiO3재료는 유전율이 높은 반면 유전율의 전계 의존성 및 온도 의존성이 크고, 산화티탄계(TiO2, CaTiO3등) 재료는 유전율이 10~180의 범위로 온도에 따른 정전 용량의 변화가 직선적으로 변화하는 특성이 있으므로 유전체로서 사용하기 위해서는 이러한 점을 고려하여 다른 성분들을 첨가, 특성을 보완할 필요가 있다.Currently, BaTiO 3 and titanium oxide-based materials are widely used as dielectric materials for ceramic capacitor dielectrics. The BaTiO 3 material has a high permittivity while the electric field dependency and the temperature dependency of the dielectric constant are large. The titanium oxide (TiO 2 , CaTiO 3, etc.) material has a dielectric constant in the range of 10 to 180, It is necessary to add other components in consideration of this point in order to use them as dielectrics and to supplement their properties.
예를 들면 BaTiO3재료를 기본 조성으로 한 유전체 조성물로는For example, as a dielectric composition having a basic composition of BaTiO 3 material
BaTiO3- PbTiO4계, BaTiO3- La2O3계,BaTiO 3 - PbTiO 4 , BaTiO 3 - La 2 O 3 ,
BaTiO3- BaSnO4계 및 BaTiO3- Ba2Bi4Ti3O12계BaTiO 3 - BaSnO 4 system and BaTiO 3 - Ba 2 Bi 4 Ti 3 O 12 system
등의 유전체 조성물, 또는 BaTiO3재료를 기본 조성으로 하여 Ca, Pb, Sr, Mg, Ni, Ti, Zn, Pb, W 성분을 첨가한 유전체 조성물이 개발되었다. TiO2재료를 기본 조성으로 한 유전체 조성물은 TiO2재료를 주성분으로 하고 SrO, Bi2O3, La2O3을 첨가한 유전체 조성물이 개발되었다.A dielectric composition containing Ca, Pb, Sr, Mg, Ni, Ti, Zn, Pb, and W components with a basic composition of a BaTiO 3 material or a dielectric composition such as TiO 2 or BaTiO 3 has been developed. A dielectric composition having a basic composition of TiO 2 material has been developed in which a main component is a TiO 2 material and SrO, Bi 2 O 3 , and La 2 O 3 are added.
본 발명에서는 고주파 대용량 세라믹 콘덴서용 유전체 조성물로서 산화티탄계 재료인 CaTiO3를 주성분으로 이용하였는데 이러한 이유는 CaTiO3재료는 유전율이 180 정도로 BaTiO3재료에 비해서 낮기는 하지만 가장 중요한 손실 계수가 0.3%로 매우 낮으며 온도에 따른 정전 용량의 변화 특성이 직선적이므로 다른 성분들을 첨가하여 전기적 특성을 개선하기가 용이하기 때문이다.In the present invention, CaTiO 3 , which is a titanium oxide-based material, is used as a dielectric composition for a high-frequency large-capacity ceramic capacitor. This is because the CaTiO 3 material has a dielectric constant of about 180, which is lower than that of a BaTiO 3 material. And it is easy to improve the electrical characteristics by adding other components because the change characteristic of the capacitance according to the temperature is linear.
본 발명에서는 CaTiO3재료를 기본 조성으로 하고, 유전 손실 특성을 좋게 하기 위하여 La2O3, Nd2O3등을 첨가하고, 소결조제 및 특성 개선을 위해 PbO, B2O3, SiO2, Al2O3, TiO2및 MgO 성분들을 첨가하여 각 성분들의 Wt% 합이 100이 되도록 하고, 이것에 절연 파괴 특성 개선을 위해 ZrO21~5wt% 첨가한 것을 특징으로 한 고주파 대용량 세라믹 콘덴서용 유전체 조성물에 관한 것이다.In the present invention, La 2 O 3 , Nd 2 O 3 and the like are added in order to improve the dielectric loss characteristic and CaTiO 3 material as a basic composition. PbO, B 2 O 3 , SiO 2 , Al 2 O 3 , TiO 2 and MgO components are added so that the sum of Wt% of each component is 100, and 1 to 5 wt% of ZrO 2 is added thereto to improve the dielectric breakdown property. To a dielectric composition.
본 발명의 조성 범위에 대해서 설명하면 다음과 같다. TiO27wt% 미만에서는 전기적 특성 즉, 유전율, 온도 계수 및 유전 손실에 변화가 없었으며 TiO212wt% 이상으로 초과되어도 유전율 및 온도 계수 등이 크게 변화되지 않았다. MgO 1wt% 미만에서도 전기적 특성에 변화가 없었으며 MgO 3wt% 이상 초과되면 유전 손실이 약간 증가된다. 희토류 산화물인 La2O3, Nd2O3의 경우에 있어서는 2wt% 미만에서는 유전 손실에 변화가 없었으며 6wt% 이상 초과되면 유전 손실이 증가되고 절연 파괴 전압이 낮아진다. PbO 1wt% 미만에서는 소성시 다 증발되어 소결조제로서 역할을 하지 못해 소결 상태가 악화되었으며 3wt% 이상 초과되면 전기적 특성이 크게 악화된다. Al2O31wt% 미만에서는 전기적 특성에 변화가 있었으며 4wt% 이상 초과되면 유전율은 감소되나 유전 손실이 증가되고 절연 파괴 전압이 낮아졌다. SiO26wt% 이상 초과되면 유전율이 증가되고 절연 파괴 전압이 낮아진다. B2O33wt% 미만에서는 유전 손실 및 소결성에 별 영향을 주지 못했으며 8wt% 이상 초과되면 유전 손실이 증가되고 절연 파괴 전압이 크게 낮아진다. 이외에도 내전압 향상을 위해 ZrO2성분을 첨가한 경우 1wt% 미만에서는 절연 파괴 전압의 향상에 효과가 없었으며 5wt% 이상 초과되어도 1~5wt% 내로 첨가된 경우에 비해서 절연 파괴 전압에 큰 변화는 없었다.The composition range of the present invention will be described as follows. Below 7 wt% TiO 2 , electrical properties such as dielectric constant, temperature coefficient and dielectric loss were not changed, and dielectric constant and temperature coefficient were not significantly changed even if TiO 2 was more than 12 wt%. Electrical properties were not changed even at less than 1 wt% of MgO, and the dielectric loss slightly increased when MgO exceeded 3 wt%. In the case of rare earth oxides La 2 O 3 and Nd 2 O 3 , the dielectric loss is not changed when the content is less than 2 wt%, while the dielectric loss is increased and the dielectric breakdown voltage is lowered when the content exceeds 6 wt%. When the content of PbO is less than 1wt%, the sintering is deteriorated due to the fact that the sintering aid does not function as a sintering aid when the sintering occurs. When the content exceeds 3wt%, the electrical characteristics are greatly deteriorated. Al 2 O 3 is less than 1wt% showed a change in the electrical property when the dielectric constant exceeds over 4wt% is the dielectric loss increases, but decreases the lower the breakdown voltage. If the SiO 2 content exceeds 6 wt%, the dielectric constant increases and the breakdown voltage decreases. Below 3 wt% of B 2 O 3 , the dielectric loss and sinterability were not significantly affected. If it exceeds 8 wt%, the dielectric loss increases and the breakdown voltage is greatly reduced. In addition, when the ZrO 2 component was added to improve the withstand voltage, the breakdown voltage was not improved at less than 1 wt%, and the breakdown voltage was not significantly changed when the breakthrough voltage exceeded 5 wt% even when it was added at 1 to 5 wt%.
상기 유전체 조성물은 바인더와 용매를 가하여 습식 분쇄법에 의해 슬러리로 만든 후 테이프 성형법으로 쉬이트를 성형, 건조한 다음 그 위에 Ag/Pd 전극 페이스트를 인쇄하고, 이것을 여러장 중첩시킨 후 고온 가압하여 적층화하였다. 이 적층시편은 적당한 크기로 절단하고 1150~1250℃로 소성하여 소결체를 만들고, 내부 전극과 통전 가능하도록 Ag 전극 페이스트를 형성, 소부한 후 적층 세라믹 콘덴서를 제조하였다.The dielectric composition is formed into a slurry by a wet pulverization method by adding a binder and a solvent, and then a sheet is formed and dried by a tape forming method. Then, an Ag / Pd electrode paste is printed on the sheet and a plurality of sheets are superposed thereon. Respectively. This laminated specimen was cut to a proper size and sintered at 1150 to 1250 ° C to form a sintered body. An Ag electrode paste was formed and baked so that it could be energized with the internal electrode, and then a multilayer ceramic capacitor was manufactured.
이와 같이 제조된 적층 세라믹 콘덴서 시편들에 대해 물리적 및 전기적 특성을 측정하였으며 그 결과는 표 1과 같다. 이 결과, 세라믹 콘덴서용 유전체 조성물의 전기적 특성값은 유전율이 74이고 유전 손실이 0.1%로 매우 낮으며 700V의 교류 내전압에서 절연 파괴과 일어나지 않았으며 온도에 따른 정전 용량의 변화율이 700ppm/℃으로 양호한 온도 계수 값을 나타내었다. 이 유전체 조성물의 경우에 있어서 온도에 따른 정전 용량의 변화는 제1도와 같다. 또한 상기 조성물에 있어서 고주파 대용량 세라믹 콘덴서용으로 사용되기 위한 가장 중요한 특성 중의 하나인 절연 파괴 특성에 크게 영향을 미치는 ZrO2첨가량에 따른 영향을 조사하였다. ZrO2 첨가량 1~5wt% 조성 범위 내에서 ZrO2첨가량 변화에 따른 유전율 및 손실 계수값은 큰 변화가 없었으나 ZrO2가 첨가되지 않은 유전체 조성물에 비해 100kHz, 700V 교류 전압에 견디는 빈도수가 크게 증가하여 절연 파괴 특성이 많이 개선되었다. 따라서 본 발명의 유전체 조성물은 고주파 영역에 있어서 고전압 대용량 세라믹 콘덴서에서 요구되는 특성을 만족시킬 수 있었다.Physical and electrical properties of the thus-prepared multilayer ceramic capacitor specimens were measured. The results are shown in Table 1. As a result, the dielectric property of the ceramic capacitor dielectric composition was 74, dielectric loss was as low as 0.1%, dielectric breakdown did not occur at an AC withstand voltage of 700 V, and the rate of change of capacitance with temperature was 700 ppm / Respectively. In the case of this dielectric composition, the change in capacitance with temperature is the same as in the first embodiment. In addition, the effect of ZrO 2 addition amount which greatly influences the dielectric breakdown property, which is one of the most important characteristics to be used for the high frequency large capacity ceramic capacitor in the above composition, was investigated. ZrO2 addition amount 1 ~ 5wt% dielectric constant and loss factor value corresponding to the ZrO 2 addition amount varies within the composition range of the dielectric breakdown in the there was no significant change resistant to 100kHz, 700V AC voltage compared to the dielectric composition of ZrO2 is not added frequency greatly increased The characteristics have improved a lot. Therefore, the dielectric composition of the present invention can satisfy the characteristics required in a high-voltage, large-capacity ceramic capacitor in a high-frequency range.
제1도는 본 발명 조성물의 온도에 따른 정전 용량 변화 곡선.FIG. 1 is a graph showing a capacitance change curve according to the temperature of the composition of the present invention.
다음에는 실시예에 의해 본 발명의 유전체 조성물에 대해 상세히 설명한다.Hereinafter, the dielectric composition of the present invention will be described in detail by examples.
고주파 고전압 세라믹 콘덴서용 유전체 조성물로서는 wt%로 CaTiO3재료를 기본 조성으로 하여 65.8%, TiO211.7%, MgO 1.0%, La2O34.2%, Nd2O34.5%, PbO 2.3%, Al2O33.8%, SiO22.6%, B2O34.1%의 조성 비율을 가지며 각 성분의 합이 100wt%로서 이것에 중량비로 ZrO22.5%을 첨가하여 유전체 조성물을 제조하였으며 이 조성물에 바인더와 용매를 가하여 습식 분쇄법에 의해 슬러리로 만든 후, 테이프 성형법으로 200㎛ 두께의 쉬이트를 성형, 건조한 다음 그 위에 Ag/Pd 전극 패이스트를 인쇄하고, 이것을 복수매 중첩하고 고온 가압하여 적층화시켰다. 이 적층 시편은 40×20mm 크기로 절단하고 1200℃에서 1시간 소성하여 소결체로 만든 후, 내부 전극과 통전 가능하도록 외부 전극인 Ag 전극 페이스트를 형성하고 600℃에서 10분 소부하여 적층 세라믹 콘덴서를 제조하였다.As a dielectric composition for a high frequency high-voltage ceramic capacitor, 65.8% of CaTiO 3 material as a basic composition, 11.7% of TiO 2 , 1.0% of MgO, 4.2% of La 2 O 3 , 4.5% of Nd 2 O 3 , 2.3% of PbO, A dielectric composition was prepared by adding 3.8% of 2 O 3 , 2.6% of SiO 2 and 4.1% of B 2 O 3 , and the sum of the components was 100% by weight and 2.5% by weight of ZrO 2 was added thereto. And a solvent were added thereto to prepare a slurry by a wet pulverization method. Then, a sheet having a thickness of 200 탆 was formed by tape molding and dried. Then, an Ag / Pd electrode paste was printed on the sheet and a plurality of such sheets were stacked. . This laminated specimen was cut into a size of 40 × 20 mm and fired at 1200 ° C. for 1 hour to form a sintered body. Then, an Ag electrode paste as an external electrode was formed so as to be able to conduct electricity with the internal electrode, and was baked at 600 ° C. for 10 minutes to manufacture a multilayer ceramic capacitor Respectively.
상기 조성으로 된 고주파 대용량 세라믹 콘덴서용 유전체 조성물에 대해 100kHz에서 전기적 특성을 측정한 결과는 표 2와 같다.The electrical characteristics of the dielectric composition for a high-frequency, large-capacity ceramic capacitor of the above composition were measured at 100 kHz.
본 발명은 고주파 대용량 세라믹 콘덴서용 유전체 조성물에 관한 것으로 더 상세히 설명하면 CaTiO3재료를 주성분으로 하고 La2O3, Nd2O3, PbO, B2O3, SiO2, Al2O3, TiO2및 MgO 성분들을 포함하며, 각각의 성분들은 Wt%로The present invention relates to a dielectric composition for a high-frequency, large-capacity ceramic capacitor, and more particularly, to a dielectric composition for a high-frequency, large-capacity ceramic capacitor which comprises CaTiO 3 as a main component and La 2 O 3 , Nd 2 O 3 , PbO, B 2 O 3 , SiO 2 , Al 2 O 3 , TiO 2 and MgO components, each of which comprises Wt%
의 범위를 갖는 조성 비율로 구성되어 있으며 이들 성분의 합은 100Wt%로서, 이것에 중량비로 ZrO21~5% 첨가한 것을 특징으로 한 고주파 대용량 세라믹 콘덴서용 유전체 조성물에 관한 것이다., And the sum of these components is 100 Wt%, and 1 to 5% of ZrO 2 is added thereto in a weight ratio. The present invention also relates to a dielectric composition for a high-frequency large-capacity ceramic capacitor.
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| CN103288440A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Ceramic composite material and super material prepared from same |
| KR102010966B1 (en) | 2019-02-28 | 2019-10-21 | (주)에이스 | Air conditioner with thermoelectric cooling element |
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| KR100297954B1 (en) * | 1998-10-10 | 2001-11-14 | 윤덕용 | High Frequency Dielectric Ceramic Composition |
| KR100310035B1 (en) * | 1999-01-15 | 2001-11-14 | 박호군 | Microwave dielectric ceramic composition for low temperature firing |
| KR100424988B1 (en) * | 2001-02-27 | 2004-03-27 | 주식회사 아모텍 | Dielectric Ceramic Compositions |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103288440A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Ceramic composite material and super material prepared from same |
| KR102010966B1 (en) | 2019-02-28 | 2019-10-21 | (주)에이스 | Air conditioner with thermoelectric cooling element |
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