KR19990050409A - Magnetic ceramic composition for microwave device, Magnetic ceramic for microwave device using same and method for manufacturing same - Google Patents
Magnetic ceramic composition for microwave device, Magnetic ceramic for microwave device using same and method for manufacturing same Download PDFInfo
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Abstract
본 발명은 민생용 및 산업용 전자기기에 사용되는 마이크로파 대역 부품용 소재에 관한 것으로, 포화자화의 제어가 용이하고 낮은 강자성공명선폭과 양호한 큐리온도를 지닌 마이크로파 소자용 자성체 세라믹 조성물, 이를 이용한 마이크로파 소자용 자성체 세라믹 및 그의 제조방법에 관한 것이다. 본 발명의 마이크로파 소자용 자성체 세라믹 조성물은, 산화이트륨, 산화철, 산화알루미늄을 주성분과 산화붕소, 산화비스무스, 산화구리와 산화붕소의 화합물, 산화아연과 산화붕소의 화합물을 부성분으로 하고, 하기 화학식 1로 표시되며, 본 발명에 따른 마이크로파 소자용 자성체 세라믹은, 하기 화학식에 따라, 산화이트륨, 산화철, 산화알루미늄을 혼합하여 하소하고, 산화붕소, 산화비스무스, 산화구리와 산화붕소의 화합물, 산화아연과 산화붕소의 화합물을 재혼합한 후, 성형 및 소결하여 제조된 것으로, 상온에서 100∼1,800 G의 포화자화와 사용온도 20∼120℃에서 0.2 %/℃ 이하의 포화자화 온도계수 및 60 Oe 이하의 강자성공명선폭을 가지면서 적정소결온도를 1250℃이하로 감소시킨 것을 특징으로 한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to materials for microwave band components used in consumer and industrial electronic devices. The present invention relates to a magnetic ceramic composition for microwave devices, which has easy control of saturation magnetization and has a low ferromagnetic resonance line width and good Curie temperature, and for microwave devices using same A magnetic ceramic and a method of manufacturing the same. The magnetic ceramic composition for a microwave device according to the present invention includes yttrium oxide, iron oxide, and aluminum oxide as a main component, a compound of boron oxide, bismuth oxide, a compound of copper oxide and boron oxide, and a compound of zinc oxide and boron oxide. The magnetic ceramic for a microwave device according to the present invention is calcined by mixing yttrium oxide, iron oxide and aluminum oxide according to the following formula, and boron oxide, bismuth oxide, a compound of copper oxide and boron oxide, zinc oxide and It is manufactured by remixing a compound of boron oxide, and then molding and sintering. It is a saturation magnetization of 100 to 1,800 G at room temperature and a saturation magnetization temperature coefficient of 0.2% / ° C or less and a ferromagnetic property of 60 Oe or less at 20 to 120 ° C. It has a resonance line width, characterized in that the appropriate sintering temperature is reduced to less than 1250 ℃.
(화학식 1 : Y3Fe5-xAlxO12(여기서, 0≤x≤1.5, 0<B2O3≤5(wt%), 0<Bi2O3≤5(wt%), 0<ZnO≤5(wt%), 0<CuO≤5(wt%), 0<ZnB2O4≤5(wt%), 0<CuB2O4≤5(wt%)이다).Formula 1: Y 3 Fe 5-x Al x O 12 (where 0 ≦ x ≦ 1.5, 0 <B 2 O 3 ≦ 5 (wt%), 0 <Bi 2 O 3 ≦ 5 (wt%), 0 a <ZnO≤5 (wt%), 0 <CuO≤5 (wt%), 0 <ZnB 2 O 4 ≤5 (wt%), 0 <CuB 2 O 4 ≤5 (wt%)).
Description
본 발명은 민생용 및 산업용 전자기기에 사용되는 마이크로파 대역 부품용 소재에 관한 것으로, 특히 포화자화의 제어가 용이하고 낮은 강자성공명선폭과 양호한 큐리온도를 지닌 마이크로파 소자용 자성체 세라믹 조성물, 이를 이용한 마이크로파 소자용 자성체 세라믹 및 그의 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to materials for microwave band components used in consumer and industrial electronic devices. In particular, magnetic ceramic compositions for microwave devices having easy ferromagnetic resonance control, low ferromagnetic resonance line width and good Curie temperature, and microwave devices using the same It relates to a magnetic ceramic and a manufacturing method thereof.
최근, 자동차전화, 휴대전화, 코드리스전화, 위성방송수신기 등의 통신수단이 범용화됨에 따라, 마이크로파 회로, 집적회로의 발전 등에 의해, 아이솔레이터, 서큘레이터, S/N 인핸서(S/N enhancer) 등의 마이크로파 대역용 소자에 자성체 세라믹이 널리 사용되고 있는 추세에 있다.Recently, as communication means such as automobile telephones, cellular phones, cordless telephones, satellite broadcasting receivers, and the like become popular, the development of microwave circuits, integrated circuits, and the like, isolators, circulators, S / N enhancers, etc. Magnetic ceramics are widely used in microwave band devices.
이러한 마이크로파 소자용 자성체 세라믹은, 주로 아이솔레이터 및 서큘레이터에 이용되고 있는데, 상기한 종래의 대표적인 마이크로파 소자용 자성체 세라믹으로는, YIG(Y3Fe5O12), Ni-Zn계 페라이트, Mn-Mg계 페라이트, Li계 페라이트 등이 있다.Such magnetic ceramics for microwave devices are mainly used for isolators and circulators. As the typical representative magnetic ceramics for microwave devices, YIG (Y 3 Fe 5 O 12 ), Ni-Zn-based ferrite, Mn-Mg Ferrite, Li ferrite and the like.
한편, 상기한 마이크로파 소자용 자성체 세라믹이 아이솔레이터, 서큘레이터 등과 같은 마이크로파 대역용 부품에 적용가능하기 위해서는, 100∼1,800 G까지 조절가능한 적당한 포화자화를 지녀야 하고, 마이크로파 대역에서 강자성공명선폭이 60 Oe 이하 정도로 작아야 하며, 포화자화의 온도계수도 0.2%/℃ 이하 정도로 작아야 하는 요구특성을 만족시켜야만 한다. 이때, 포화자화의 온도계수가 크면, 평탄한 온도안정성을 얻기가 힘들고, 강자성공명선폭이 크면, 마이크로파 대역에서 우수한 손실특성을 얻을 수 없게 된다.On the other hand, in order for the above-mentioned magnetic ceramics for microwave devices to be applied to components for microwave bands such as isolators and circulators, the magnetic ceramics must have a suitable saturation magnetization that can be adjusted to 100 to 1,800 G, and the ferromagnetic resonance line width in the microwave band is 60 Oe or less It should be small enough to satisfy the required characteristics that the temperature coefficient of saturation magnetization should be small as 0.2% / ℃ or less. At this time, when the temperature coefficient of saturation magnetization is large, it is difficult to obtain flat temperature stability, and when the ferromagnetic resonance line width is large, excellent loss characteristics in the microwave band cannot be obtained.
그러나, 상기한 종래의 마이크로파 소자용 자성체 세라믹 중에서, YIG계의 경우는, 적당한 포화자화를 지니며 강자성공명선폭이 작은 반면에, 포화자화의 온도계수가 0.3∼0.4 %/℃로 비교적 큰 값을 가지고 있었다.However, in the above-mentioned magnetic ceramics for microwave devices, in the case of the YIG system, while having a moderate saturation magnetization and a small ferromagnetic resonance line width, the temperature coefficient of the saturation magnetization has a relatively large value of 0.3 to 0.4% / 占 폚. there was.
또한, 상기한 Ni-Zn계 페라이트와 Mn-Mg계 페라이트는 포화자화가 크고, 온도계수는 비교적 작으나, 강자성공명선폭이 160 Oe이상으로 크다는 문제점을 지니고 있었다. 아울러, 상기한 Li계 페라이트도 적당한 포화자화를 지니고 온도계수도 작으나, 강자성공명선폭이 300 Oe 이상으로 매우 크다는 문제점을 지니고 있었다.In addition, the Ni-Zn-based ferrite and Mn-Mg-based ferrite have a large saturation magnetization and a relatively small temperature coefficient, but have a problem that the ferromagnetic resonance line width is larger than 160 Oe. In addition, the Li-based ferrite also has a moderate saturation magnetization and a small temperature coefficient, but has a problem that the ferromagnetic resonance line width is very large, 300 Oe or more.
따라서, 상기한 종래기술에 따른 마이크로파 소자용 자성체 세라믹을 마이크로파 대역용 부품에 실제적으로 적용하기에는 실용상 문제점이 있을 뿐 아니라, 자성체 세라믹 제조시 산화이트륨, 산화철 등과 같은 고가의 원료를 사용하기 때문에, 경제성이 떨어진다는 문제점을 지니고 있었다.Therefore, there is not only a practical problem in applying the above-mentioned conventional magnetic ceramics for the microwave device to the components for the microwave band, but also expensive materials such as yttrium oxide and iron oxide are used in manufacturing the magnetic ceramics. This fall had the problem.
본 발명은 상기한 종래기술의 문제점을 해결하기 위한 것으로, 본 발명의 주된 목적은 제어가 용이하며 적당한 포화자화를 지니고 마이크로파 대역에서 작은 강자성공명선폭을 지니며 포화자화의 온도계수도 작을 뿐 아니라, 안정된 구성원소의 조성비를 지님은 물론, 적정소결온도를 1250℃이하로 낮추어 줌으로써 경제적으로 자성체 세라믹을 제조할 수 있는, 마이크로파 소자용 자성체 세라믹 조성물을 제공함에 있다.The present invention is to solve the above problems of the prior art, the main object of the present invention is easy to control, has a moderate saturation magnetization, has a small ferromagnetic resonance line width in the microwave band, the temperature coefficient of the saturation magnetization is small, as well as stable The present invention provides a magnetic ceramic composition for microwave devices capable of economically manufacturing magnetic ceramics by lowering the appropriate sintering temperature to 1250 ° C. or less, as well as having a composition ratio of member elements.
본 발명의 또 다른 목적은 제어가 용이하며 적당한 포화자화를 지니고 마이크로파 대역에서 작은 강자성공명선폭을 지니며 포화자화의 온도계수도 작아, 마이크로파 대역용 부품에 실제적으로 적용이 가능한, 상기한 본 발명의 자성체 세라믹 조성물을 이용한 마이크로파 소자용 자성체 세라믹 및 그의 제조방법을 제공함에 있다.Another object of the present invention is the above-described magnetic material of the present invention, which is easy to control, has a moderate saturation magnetization, has a small ferromagnetic resonance line width in the microwave band, and has a small temperature coefficient of saturation magnetization, which is practically applicable to a component for a microwave band. A magnetic ceramic for a microwave device using the ceramic composition and a method of manufacturing the same.
상기한 목적을 달성하기 위한, 본 발명의 마이크로파 소자용 자성체 세라믹 조성물은, 산화이트륨(Y2O3), 산화철(Fe2O3), 산화알루미늄(Al2O3)을 주성분으로 하며, 산화붕소(B2O3), 산화비스무스(Bi2O3), 산화구리와 산화붕소의 화합물(CuB2O4), 산화아연과 산화붕소의 화합물(ZnB2O4)을 부성분으로 하며, 하기 화학식 1로 표시된다:In order to achieve the above object, the magnetic ceramic composition for a microwave device of the present invention contains yttrium oxide (Y 2 O 3 ), iron oxide (Fe 2 O 3 ), and aluminum oxide (Al 2 O 3 ) as main components, and Boron (B 2 O 3 ), bismuth oxide (Bi 2 O 3 ), a compound of copper oxide and boron oxide (CuB 2 O 4 ), a compound of zinc oxide and boron oxide (ZnB 2 O 4 ) as a minor component, It is represented by Formula 1:
여기서, 0≤x≤1.5, 0<B2O3≤5(wt%), 0<Bi2O3≤5(wt%), 0<ZnO≤5(wt%), 0<CuO≤5(wt%), 0<ZnB2O4≤5(wt%), 0<CuB2O4≤5(wt%)이다.Where 0 ≦ x ≦ 1.5, 0 <B 2 O 3 ≦ 5 (wt%), 0 <Bi 2 O 3 ≦ 5 (wt%), 0 <ZnO ≦ 5 (wt%), 0 <CuO ≦ 5 ( wt%), 0 <ZnB 2 O 4 ≦ 5 (wt%), and 0 <CuB 2 O 4 ≦ 5 (wt%).
본 발명에 따른 마이크로파 소자용 자성체 세라믹은, 상기 화학식 1에 따라, 산화이트륨, 산화철,산화알루미늄을 혼합한 후, 성형 및 소결하여 제조된 것으로, 소결조제의 첨가로 인하여 1250℃이하로 소결온도를 낮춤으로써, 상온에서 100∼1,800 G의 포화자화와 0.2 %/℃ 이하의 포화자화 온도계수 및 60 Oe 이하의 강자성공명선폭을 지닌 것을 특징으로 한다.The magnetic ceramic for microwave devices according to the present invention is manufactured by mixing yttrium oxide, iron oxide, and aluminum oxide, followed by molding and sintering according to Chemical Formula 1, and the sintering temperature is lowered to 1250 ° C. or lower due to the addition of a sintering aid. By lowering, it is characterized by having a saturation magnetization of 100 to 1,800 G at room temperature, a saturation magnetization temperature coefficient of 0.2% / ° C. or less, and a ferromagnetic resonance line width of 60 Oe or less.
아울러, 본 발명에 따른 마이크로파 소자용 자성체 세라믹의 제조방법은, 상기 화학식 1에 따라, 산화이트륨, 산화철, 산화알루미늄을 혼합하는 단계와, 상기한 혼합물을 건조시킨 후 1,100∼1,200℃에서 1∼3시간 동안 하소를 수행하는 단계와, 상기 단계에서 하소를 거친 분말에 부조성과 결합제를 가하여 혼합하고, 소정 형상으로 성형하는 단계와, 상기 단계에서 얻어진 성형품을 공기분위기 하에서 1,200∼1,400℃에서 소성하는 단계를 포함한다.In addition, the method of manufacturing a magnetic ceramic for a microwave device according to the present invention, according to the formula (1), the step of mixing yttrium oxide, iron oxide, aluminum oxide, and after drying the mixture of 1 to 3 at 1,100 to 1,200 ℃ Carrying out calcination for a period of time, mixing and adding the coarseness and binder to the calcined powder in the step, molding into a predetermined shape, and firing the molded product obtained in the step at 1,200 to 1,400 ° C. under an air atmosphere. It includes.
상기한 본 발명의 마이크로파 소자용 자성체 세라믹 조성물에 있어서, 산화철에 대한 산화알루미늄의 치환량이 증가하면, 마이크로파 소자용 자성체 세라믹에 대한 포화자화는 감소하나, 치환량이 1.5몰 이상인 경우에는, 포화자화의 감소와 더불어, 강자성공명선폭이 급격히 증가되어 실용화가 곤란한 단점이 있다.In the magnetic ceramic composition for a microwave device according to the present invention, when the substitution amount of aluminum oxide to iron oxide is increased, the saturation magnetization of the magnetic ceramic for microwave devices is reduced, but when the substitution amount is 1.5 mol or more, the saturation magnetization is reduced. In addition, the ferromagnetic resonance line width is sharply increased, which makes it difficult to use.
또한, 상기한 본 발명의 조성물에 있어서, 산화비스무스, 산화아연, 산화아연과 산화붕소의 화합물의 첨가량이 증가하면, 마이크로파 소자용 자성체 세라믹에 대한 포화자화와 강자성공명선폭이 감소하고 적정소결온도가 1300℃이하로 낮아지나, 그 첨가량이 5 wt%이상인 경우에는, 액상소결에 의해 과잉소결되어 자성체를 형성하지 못하므로 실용화가 곤란한 단점이 있다. 그리고, 상기한 본 발명의 조성물에 있어서, 산화붕소, 산화구리, 산화구리와 산화붕소의 화합물의 첨가량이 증가함에 따라 포화자화와 강자성공명선폭이 감소되고 포화자화의 온도계수가 낮아짐은 물론, 적정 소결온도가 1250℃이하로 낮아지나, 5 wt% 이상 치환되는 경우에는, 과잉소결과 더불어, 강자성공명선폭이 증가한다는 문제점이 있다.In addition, in the composition of the present invention described above, when the addition amount of the compound of bismuth oxide, zinc oxide, zinc oxide and boron oxide is increased, the saturation magnetization and ferromagnetic resonance line width of the magnetic ceramic for microwave devices are reduced and the appropriate sintering temperature is increased. Although it is lowered below 1300 ° C., when the added amount is 5 wt% or more, it is excessively sintered by liquid phase sintering to form a magnetic substance. In addition, in the composition of the present invention, as the addition amount of the compound of boron oxide, copper oxide, copper oxide and boron oxide is increased, the saturation magnetization and ferromagnetic resonance line width are reduced, and the temperature coefficient of saturation magnetization is low, as well as appropriate sintering. When the temperature is lowered below 1250 ° C., but substituted at 5 wt% or more, there is a problem that the ferromagnetic resonance line width increases with the result of excess sintering.
이하, 본 발명에 따른 마이크로파 소자용 자성체 세라믹 조성물, 이를 이용한 마이크로파 소자용 자성체 세라믹 및 그의 제조방법에 대한 바람직한 실시예를 통하여 본 발명을 더욱 상세히 설명한다. 이들 실시예는 본 발명을 보다 구체적으로 설명하기 위해 주어진 것으로, 본 발명은 하기 실시예에 의해 제한되지 않는다는 것은 본 발명이 속한 기술분야의 당업자에게 있어서 자명할 것이다.Hereinafter, the present invention will be described in more detail with reference to preferred embodiments of the magnetic ceramic composition for microwave devices, the magnetic ceramic for microwave devices using the same, and a method of manufacturing the same. These examples are given to illustrate the present invention in more detail, and it will be apparent to those skilled in the art that the present invention is not limited by the following examples.
(실시예)(Example)
산화이트륨, 산화철을 하기 표 1, 표 2, 표 3에 나타낸 조성비와 같이 평량하여, 탈이온수와 함께 혼합하였다. 이때, 혼합은 볼밀링(ball-milling) 방법을 이용하였으며, 지르코니아 볼과 플라스틱 단지를 사용하였다.Yttrium oxide and iron oxide were basis weights as shown in Table 1, Table 2, and Table 3 below, and mixed with deionized water. In this case, the mixing was performed using a ball milling method, and a zirconia ball and a plastic jar were used.
혼합이 이루어진 후 혼합물을 건조시키고, 건조된 분말을 1,100∼1,200℃에서 2시간 동안 하소를 수행하였다. 하소가 이루어진 분말에 하기 표 1, 표 2, 표 3에 나타낸 조성비와 같이 결합조제로 사용되는 부조성을 평량하여 혼합하였고, 결합제(binder)로 사용되는 폴리비닐알콜을 적정량 첨가하여 지르코니아 유발 내에서 혼합하였다.After mixing, the mixture was dried, and the dried powder was calcined at 1,100 to 1,200 ° C. for 2 hours. The calcined powder was mixed in a basis weight as a composition ratio shown in Table 1, Table 2, and Table 3, and mixed in a zirconia trigger by adding an appropriate amount of polyvinyl alcohol used as a binder. It was.
혼합된 재료를 금형과 유압 프레스를 사용하여 직경 10mm 이상, 높이 3mm 이하의 디스크형 시편으로 성형하였다. 이때, 성형압력은 1.0ton/㎠ 이상이었다.The mixed materials were molded into disc-shaped specimens of 10 mm or more in diameter and 3 mm or less in height using a mold and a hydraulic press. At this time, the molding pressure was 1.0 ton / cm 2 or more.
성형된 시편을 이용하여 구형 시편을 제조한 후, 지르코니아 셋터(setter) 위에 적재하고, 공기분위기 하에서 1,200℃ 이상의 고온에서 전기로를 이용하여 소결하였다.Spherical specimens were prepared using the molded specimens, loaded on a zirconia setter, and sintered using an electric furnace at a high temperature of 1,200 ° C. or higher under an air atmosphere.
물성평가Property evaluation
상기 실시예에서 얻어진, 마이크로파 소자용 자성체 세라믹 시편을 진동시편자력계(vibrating sample magnetometer)를 사용하여 포화자화 및 온도변화에 따른 포화자화를 측정하였으며, 공동 공진기 섭동방법으로 약 10 GHz에서 자기장을 가하면서 강자성공명선폭을 측정하였다.The magnetic ceramic specimens for the microwave device obtained in the above example were measured using a vibrating sample magnetometer to measure the saturation magnetization according to saturation magnetization and temperature change, while applying a magnetic field at about 10 GHz using the cavity resonator perturbation method. The ferromagnetic resonance line width was measured.
또한, 포화자화의 온도계수는 하기 식에 따라 20℃의 온도에 대한 포화자화를 기준으로 20℃∼120℃의 온도범위에 대하여 구하였다.In addition, the temperature coefficient of saturation magnetization was calculated | required about the temperature range of 20 degreeC-120 degreeC on the basis of the saturation magnetization with respect to the temperature of 20 degreeC according to the following formula.
상기 수학식 1에서, α는 포화자화의 온도계수, 4πMs(120℃)는 120℃에서의 포화자화, 4πMs(20℃)는 20℃에서의 포화자화, ΔT는 측정온도차(이 경우에는, 120℃-20℃ = 100℃)를 나타낸다.In Equation 1, α is a temperature coefficient of saturation magnetization, 4πMs (120 ° C) is a saturation magnetization at 120 ℃, 4πMs (20 ° C) is a saturation magnetization at 20 ℃, ΔT is a measurement temperature difference (in this case, 120 ° C-20 ° C = 100 ° C).
상기한 과정에 따라 측정한, 본 발명의 마이크로파 소자용 자성체 세라믹에 대한 포화자화, 강자성공명선폭 및 포화자화 온도계수를 하기 표 1, 표 2, 표 3에 나타내었다.The saturation magnetization, ferromagnetic resonance line width, and saturation magnetization temperature coefficients of the magnetic ceramic for the microwave device of the present invention, measured according to the above procedure, are shown in Tables 1, 2, and 3 below.
상기 표 1, 표 2, 표 3의 결과에서 보듯이, 마이크로파 소자용 자성체 세라믹 조성중 산화철에 대한 산화알루미늄의 치환량이 증가함에 따라, 부조성의 첨가량이 증가되었으며, 포화자화는 감소하였고, 마이크로파대 강자성공명선폭이 감소하다가 증가함을 알 수 있었다. 산화비스무스, 산화아연, 산화아연과 산화붕소의 화합물의 첨가량이 증가하면, 마이크로파 소자용 자성체 세라믹에 대한 포화자화는 감소하고 마이크로파대 강자성공명선폭이 감소하다가 증가하였다. 또한, 적정소결온도가 1300℃이하로 낮아지나, 그 첨가량이 5 wt%이상인 경우에는, 액상소결에 의해 과잉소결되어 자성체를 형성하지 못하였다.As shown in the results of Table 1, Table 2, and Table 3, as the substitution amount of aluminum oxide to iron oxide in the magnetic ceramic composition for the microwave device is increased, the amount of misalignment is increased, the saturation magnetization is decreased, microwave band ferromagnetic The resonance line width decreased and then increased. As the addition amount of the compound of bismuth oxide, zinc oxide, zinc oxide and boron oxide increased, the saturation magnetization of the magnetic ceramics for microwave devices decreased and the microwave band ferromagnetic resonance line width decreased. In addition, although the proper sintering temperature was lowered to 1300 ° C. or lower, when the addition amount thereof was 5 wt% or more, it was excessively sintered by liquid phase sintering to form a magnetic body.
그리고, 본 발명의 조성물 중 산화붕소, 산화구리, 산화구리와 산화붕소의 화합물의 첨가량이 증가함에 따라 포화자화와 강자성공명선폭이 감소되고 포화자화의 온도계수가 낮아짐은 물론, 적정 소결온도가 1250℃이하로 낮아지나, 5 wt% 이상 치환되는 경우에는, 과잉소결과 더불어, 마이크로파대 강자성공명선폭이 증가하였다.이때, 부조성의 적정 조성비는 첨가량에 따라 변화될 수 있으며, 0.1∼5 wt% 범위에서 특성치가 적정값을 나타내었다.In addition, as the addition amount of the compound of boron oxide, copper oxide, copper oxide and boron oxide increases in the composition of the present invention, the saturation magnetization and ferromagnetic resonance line width are reduced, the temperature coefficient of saturation magnetization is lowered, and the appropriate sintering temperature is 1250 ° C. When lowered below, but substituted at 5 wt% or more, in addition to the excess sintering, the microwave band ferromagnetic resonance line width increased. At this time, an appropriate composition ratio of the incompatibility may vary depending on the amount added, and is in the range of 0.1 to 5 wt%. The characteristic value at shows an appropriate value.
한편, 동일한 조성에서는 소결온도가 높아지면 소결체의 포화자화가 약간 높아지고, 소결시간이 길어지면 마이크로파대 강자성공명선폭이 약간 낮아짐을 확인할 수 있었다.On the other hand, in the same composition, as the sintering temperature is increased, the saturation magnetization of the sintered body is slightly higher, and when the sintering time is longer, the microwave band ferromagnetic resonance line width is slightly lowered.
상기한 본 발명에 따르면, 상온에서 100∼1,800 G의 포화자화와 0.2 %/℃ 이내의 포화자화 온도계수 및 60 Oe 이하의 페리자성공명반치폭을 갖는, 적당한 포화자화와 평탄한 온도안정성 및 손실특성이 우수한 마이크로파 소자용 자성체 세라믹을 얻을 수 있고, 소결조제의 첨가로 인해 적정소결온도를 낮추어줄 수 있으므로, 본 발명의 자성체 세라믹은 마이크로파대 아이솔레이터, 서큘레이터 및 S/N 인핸서 등의 마이크로파 대역용 부품에 효과적으로 사용될 수 있다.According to the present invention described above, suitable saturation magnetization and flat temperature stability and loss characteristics have a saturation magnetization of 100 to 1,800 G, a saturation magnetization temperature coefficient within 0.2% / ° C, and a ferrimagnetic resonance half width of 60 Oe or less at room temperature. Since excellent magnetic ceramics for microwave devices can be obtained and the appropriate sintering temperature can be lowered by the addition of a sintering aid, the magnetic ceramics of the present invention can be applied to microwave band components such as microwave isolators, circulators and S / N enhancers. Can be used effectively.
또한, 본 발명에서는, 고가의 산화이트륨과 산화철에 저가의 산화알루미늄, 산화붕소, 산화비스무스, 산화아연, 산화구리, 산화아연과 산화붕소의 화합물, 산화구리와 산화붕소의 화합물을 원료로 사용하므로, 경제적으로 고품위의 마이크로파 소자용 자성체 세라믹을 제공할 수 있다.Furthermore, in the present invention, inexpensive yttrium oxide and iron oxide are used as raw materials of inexpensive aluminum oxide, boron oxide, bismuth oxide, zinc oxide, copper oxide, compounds of zinc oxide and boron oxide, and compounds of copper oxide and boron oxide as raw materials. In addition, it is possible to economically provide high quality magnetic ceramics for microwave devices.
Claims (4)
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