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公开(公告)号：US06620754B2
公开(公告)日：2003-09-16
申请号：US09893701
申请日：2001-06-29
IPC分类号： C04B35468
CPC分类号： C04B35/468
摘要： The ceramic capacitor in accordance with the present invention is fabricated by employing a dielectric ceramic composition in forming dielectric layers thereof, wherein the dielectric ceramic composition contains an oxide of Ba and Ti, an oxide of Re (Re used herein represents one or more rare-earth elements selected from Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Y), an oxide of Mg, one or more oxides selected from oxides of Mn, V and Cr, an oxide of Mo and/or W and SiO2 or a glass component including SiO2, wherein the amount of the oxide of Ba and Ti is 100 mol % in terms of BaTiO3, the amount of the oxide of Re is 0.25 to 1.5 mol % in terms of Re2O3, the amount of the oxide of Mg is 0.2 to 1.5 mol % in terms of MgO and the amount of one or more oxides of Mn, V or Cr is 0.03 to 0.6 mol % in terms of Mn2O3, V2O5, Cr2O3, respectively, and the amount of the oxide of Mo and/or W is 0.025 to 0.25 mol % in terms of MoO3 and WO3.
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公开(公告)号：US06524983B2
公开(公告)日：2003-02-25
申请号：US09893702
申请日：2001-06-29
IPC分类号： C04B35468
CPC分类号： C04B35/4682
摘要： The ceramic capacitor in accordance with the present invention is fabricated by employing a dielectric ceramic composition in forming dielectric layers thereof, wherein the dielectric ceramic composition contains an oxide of Ba and Ti, an oxide of Re (Re used herein represents one or more rare-earth elements selected from Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Y) and one or more oxides selected from oxides of Mn, V and Cr, wherein the amount of the oxide of Ba and Ti is 100 mol % in terms of BaTiO3, the amount of the oxide of Re is 0.25 to 1.5 mol % in terms of Re2O3 and the amount of one or more oxides of Mn, V or Cr is 0.03 to 0.6 mol % in terms of Mn2O3, V2O5, Cr2O3, respectively, wherein the ratio of Ba to Ti ranges between 0.970 and 1.030.
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公开(公告)号：US5103370A
公开(公告)日：1992-04-07
申请号：US620834
申请日：1990-11-29
CPC分类号： H01G4/1245 , C04B35/49 , Y10T29/435
摘要： A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, R is a rare earth element or elements, and .alpha., k, x and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a first additive ingredient and a second additive ingredient. The first additive ingredient is at least either of chromium oxide and aluminum oxide. The second additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein. The moldings and electrodes are cosintered in a reductive or neutral atmosphere at temperatures of less than 1200 degrees C. and then are heated at a lower temperature in an oxidative atmosphere.
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公开(公告)号：US5077636A
公开(公告)日：1991-12-31
申请号：US618710
申请日：1990-11-27
CPC分类号： C04B35/49 , H01G4/1245 , Y10T29/435
摘要： A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.){(Ba.sub.k-x-z M.sub.x L.sub.z)O.sub.k (Ti.sub.1-y R.sub.y)O.sub.2-(y/2) }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, L is either or both of calcium and magnesium, R is a rare earth element or elements, and .alpha., k, x, z and y are numerals in specified ranges. To this major ingredient is added a minor proportion of an additive ingredient. The additive ingredient is a mixture of boric oxide or lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein. The moldings and electrodes are cosintered in a reductive or neutral atmosphere at temperatures of less than 1200 degrees C. and then are heated at a lower temperature in an oxidative atmosphere.
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公开(公告)号：US4999739A
公开(公告)日：1991-03-12
申请号：US483140
申请日：1990-02-21
申请人： Hiroshi Kishi , Hirokazu Chazono , Minoru Oshio , Hiroshi Saito , Toshiya Nakamura , Hisamitsu Shizuno
发明人： Hiroshi Kishi , Hirokazu Chazono , Minoru Oshio , Hiroshi Saito , Toshiya Nakamura , Hisamitsu Shizuno
IPC分类号： C04B35/46 , C04B35/468 , C04B35/49 , H01G4/12
CPC分类号： C04B35/4682 , C04B35/49 , H01G4/1245
摘要： A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2 }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, and .alpha., k and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a mixture of boric oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein. The moldings and electrodes are cosintered in a reductive or neutral atmosphere at temperatures of less than 1200.degree. C. and then are reheated at a lower temperature in an oxidative atmosphere.
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公开(公告)号：US06614644B2
公开(公告)日：2003-09-02
申请号：US09785064
申请日：2001-02-15
IPC分类号： H01G406
CPC分类号： H01G4/1209
摘要： A multilayer ceramic capacitor includes sintered laminated bodies having a plurality of dielectric layers alternately stacked with a multiplicity of internal electrodes, and a pair of external electrodes electrically coupled to the internal electrodes. The dielectric layer is of sintered ceramic grains. The ceramic grains include a core portion surrounded by a shell portion or a solid solution. The ceramic grains contain additive elements such as acceptor elements and/or rare earth elements. The additive elements are non-uniformly distributed in the core and/or shell portion of the ceramic grain or in the solid solution. Such non-uniform distribution of the additive elements in ceramic grains promotes or facilitates the re-oxidation process of the ceramic grains and also increases electrical resistance thereof. Accordingly, the operating life characteristics of the multilayer ceramic capacitors, especially those incorporating therein thin dielectric layers, can be improved. As a result, the thickness of dielectric layers can be further reduced and a greater number of dielectric layers can be used in forming multilayer ceramic capacitors, enabling miniaturization and large capacitance thereof to be achieved.
摘要翻译： 多层陶瓷电容器包括具有交替层叠有多个内部电极的多个电介质层和电连接到内部电极的一对外部电极的烧结层叠体。 电介质层是烧结陶瓷晶粒。 陶瓷颗粒包括由壳部分或固溶体包围的芯部分。 陶瓷颗粒含有添加元素，例如受主元素和/或稀土元素。 添加剂元素不均匀地分布在陶瓷颗粒的芯部和/或壳部分或固体溶液中。 添加元素在陶瓷颗粒中的这种不均匀分布促进或促进了陶瓷颗粒的再氧化过程，并且还增加了其电阻。 因此，可以提高多层陶瓷电容器的使用寿命特性，特别是那些结合有薄介电层的陶瓷电容器。 结果，可以进一步减小电介质层的厚度，并且可以在形成多层陶瓷电容器中使用更多数量的电介质层，从而实现小型化和大的电容。
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公开(公告)号：US5225960A
公开(公告)日：1993-07-06
申请号：US851510
申请日：1992-03-16
申请人： Hiroshi Kishi , Hiroshi Saito , Hisamitsu Shizuno , Yuji Nishi , Katsuhiko Arai
发明人： Hiroshi Kishi , Hiroshi Saito , Hisamitsu Shizuno , Yuji Nishi , Katsuhiko Arai
IPC分类号： C04B35/46 , C04B35/468 , H01B3/12 , H01G4/12
CPC分类号： H01G4/1227 , C04B35/4684 , H01G4/1245 , Y10T29/435
摘要： Disclosed is a ceramic capacitor of a mono-layer structure or a multi-layer structure, which has characteristic X7R (characteristic B) and which is high in reliability in direct current breakdown voltage at 125.degree. C. and small in size. The ceramic capacitor has a dielectric layer and internal electrodes disposed so as to interpose the dielectric layer. The dielectric layer is composed of a sintered body of ceramic particles whose core sections are made mainly of BaTiO.sub.3 and whose shell sections are made from BaTiO.sub.3 in the form of a solid solution composed of an oxide of one or more than one element selected from Mg, Ca, Sr and Zn and an oxide of one or more than one element selected from Sc, Y, Gd, Dy, Ho, Er, Yb, Tb, Tm and Lu.
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公开(公告)号：US5181157A
公开(公告)日：1993-01-19
申请号：US773645
申请日：1991-10-17
IPC分类号： C04B35/465 , C04B35/468 , H01G4/12
CPC分类号： C04B35/465 , C04B35/4682 , H01G4/1227 , Y10T29/435
摘要： A ceramic capacitor having excellent electric characteristics which includes internal electrodes essentially comprising a base metal such as Ni, and a method for fabricating the capacitor includes the step of firing under a non-oxidation atmosphere. A dielectric layer of the ceramic capacitor comprises basic and additional components. The basic component comprises a material represented by the following formula:(Ba.sub.k-(x+y) M.sub.x L.sub.y)O.sub.k (Ti.sub.1-z R.sub.z)O.sub.2-l z/2where, M is Mg and/or Zn, L is Ca and/or Sr, R is a rare earth element, and k, x, z and y are numerals fulfilling the conditions of 1.00.ltoreq.k.ltoreq.1.05, 0
摘要翻译： PCT No.PCT / JP91 / 00396 Sec。 371日期1991年10月17日 102（e）1991年10月17日PCT 1991年3月28日PCT公布。 出版物WO91 / 15023 日期：1991年10月3日。具有优异电特性的陶瓷电容器，其包括基本上包含诸如Ni的贱金属的内部电极，以及制造该电容器的方法包括在非氧化气氛下烧制的步骤。 陶瓷电容器的电介质层包括基本部件和附加部件。 碱性组分包括由下式表示的材料：（Bak-（x + y）MxLy）Ok（Ti1-zRz）O2-lz / 2其中，M是Mg和/或Zn，L是Ca和/或Sr ，R是稀土元素，k，x，z和y是满足1.00≤0.05,0
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公开(公告)号：US5006954A
公开(公告)日：1991-04-09
申请号：US483076
申请日：1990-02-21
申请人： Hiroshi Kishi , Hirokazu Chazono , Minoru Oshio , Hiroshi Saito , Toshiya Nakamura , Hisamitsu Shizuno
发明人： Hiroshi Kishi , Hirokazu Chazono , Minoru Oshio , Hiroshi Saito , Toshiya Nakamura , Hisamitsu Shizuno
IPC分类号： C04B35/46 , C04B35/468 , C04B35/49 , H01G4/12
CPC分类号： C04B35/49 , C04B35/4682 , H01G4/1245
摘要： A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2 }+.alpha.CaZrO.sub.3where M is either or both of magnesium and zinc, and .alpha., k and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a mixture of lithium oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein. The moldings and electrodes are cosintered in a reductive or neutral atmosphere at temperatures of less than 1200.degree. C. and then are reheated at a lower temperature in an oxidative atmosphere.
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公开(公告)号：US4999738A
公开(公告)日：1991-03-12
申请号：US483079
申请日：1990-02-21
申请人： Hiroshi Kishi , Hirokazu Chazono , Minoru Oshio , Hiroshi Saito , Toshiya Nakamura , Hisamitsu Shizuno
发明人： Hiroshi Kishi , Hirokazu Chazono , Minoru Oshio , Hiroshi Saito , Toshiya Nakamura , Hisamitsu Shizuno
CPC分类号： C04B35/49 , H01G4/1245
摘要： A monolithic capacitor having a dielectric ceramic body cosintered with at least two base metal electrodes. The ceramic body is composed of a major ingredient expressed by the formula,(1-.alpha.){(Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2 }+.alpha.CaZrO.sub.3where M is either or both of calcium and strontium, and .alpha., k and y are numerals in specified ranges. To this major ingredient is added a minor proportion of a mixture of boric oxide, silicon dioxide and at least one metal oxide selected from among barium oxide, strontium oxide, calcium oxide, magnesium oxide and zinc oxide. For the fabrication of capacitors the mixture of the above major ingredient and additives in finely divided form are formed into moldings of desired shape and size, each with at least two electrodes buried therein. The moldings and electrodes are cosintered in a reductive or neutral atmosphere at temperatures of less than 1200.degree. C. and then are reheated at a lower temperature in an oxidative atmosphere.
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