公开(公告)号：US5208727A

公开(公告)日：1993-05-04

申请号：US582221

申请日：1991-08-05

申请人： Kaori Okamoto ,  Yasuo Wakahata ,  Iwao Ueno

发明人： Kaori Okamoto ,  Yasuo Wakahata ,  Iwao Ueno

IPC分类号： H01C7/115 ,  H01G4/12

CPC分类号： C04B35/47 ,  C01G23/002 ,  C01G23/006 ,  C01G45/006 ,  H01C7/115 ,  H01G4/1281 ,  C01P2002/34 ,  C01P2002/50 ,  C01P2004/82 ,  C01P2006/32 ,  C01P2006/40 ,  C04B2235/3201 ,  C04B2235/3203 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3222 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3229 ,  C04B2235/3239 ,  C04B2235/3251 ,  C04B2235/3258 ,  C04B2235/3267 ,  C04B2235/3418 ,  C04B2235/3427 ,  C04B2235/5445 ,  C04B2235/6025 ,  C04B2235/652 ,  C04B2235/663 ,  C04B2235/79 ,  C04B2235/85 ,  Y10T29/435

摘要： The present invention provides a semiconductor-type laminated ceramic capacitor with a grain boundary-insulated structure made of Sr.sub.(1-x) Ca.sub.x TiO.sub.3 as a main component, comprising the functions of a conventional capacitor which absorbs low voltage noises and high frequency noises, and a varistor when high voltage noises and electrostatic charges invade, wherein simultaneous sintering of the materials of ceramic capacitor together with the materials of inner electrodes was made possible in the manufacturing process. Besides, material to be made semiconductive is added to the main component of Sr.sub.(1-x) Ca.sub.x TiO.sub.3 excess in Ti, the materials of Mn-Si, which are converted to MnO.sub.2 and SiO.sub.2 in the sintering process, are also added to the main component. A grain boundary insulated, semiconductor type capacitor is manufactured easily using only a re-oxidation process by using the starting material of the above-described composition, thereby eliminating surface diffusion process of metal oxides which is used in manufacturing conventional capacitors. According to the manufacturing method of the present invention, calcination process of laminated raw sheets prevents troubles occurring in laminated ceramic capacitors with varistor function, such as breaks of electric connections in inner electrodes; de-lamination of ceramic sheet; cracks in ceramic sheet; decrease of sintering density; and non-uniformity in the texture of sintered body, thereby improving electric characteristics, i.e. capacitance, voltage non-linearity coefficient .alpha. and varistor voltage, and reliability of the products. The present invention provides two major advantages in the composition of materials and in the manufacturing process.

公开(公告)号：US5268006A

公开(公告)日：1993-12-07

申请号：US920749

申请日：1992-07-28

申请人： Iwao Ueno ,  Yasuo Wakahata ,  Kimio Kobayashi ,  Kaori Okamoto ,  Akihiro Takami

发明人： Iwao Ueno ,  Yasuo Wakahata ,  Kimio Kobayashi ,  Kaori Okamoto ,  Akihiro Takami

IPC分类号： H01G4/12 ,  H01G7/00 ,  H01G4/06

CPC分类号： C04B35/47 ,  C01G23/006 ,  C01G33/006 ,  C01G45/006 ,  C04B35/62685 ,  H01G4/1281 ,  C01P2002/50 ,  C01P2006/40 ,  C04B2235/3201 ,  C04B2235/3203 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3222 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3229 ,  C04B2235/3239 ,  C04B2235/3251 ,  C04B2235/3258 ,  C04B2235/3267 ,  C04B2235/3418 ,  C04B2235/3427 ,  C04B2235/5445 ,  C04B2235/6025 ,  C04B2235/652 ,  C04B2235/663 ,  C04B2235/79 ,  C04B2235/85 ,  Y10T29/417 ,  Y10T29/435

摘要： A method for manufacturing semiconductor-type laminated ceramic capacitors with a grain boundary-insulated structure including the steps of calcinating starting material of mixed powder in air or in nitrogen atmosphere after grinding, mixing and drying the mixed powder; forming raw sheets; printing a pattern of inner electrode paste on the surface of the raw sheets; calcinating the laminated body in air; sintering the laminated raw sheets in reducing atmosphere or in nitrogen atmosphere after calcination; re-oxidizing in air after sintering; and covering the edges of sintered ceramic sheets with outer electrode paste and baking after re-oxidation, terminals of inner electrodes being exposed to the edges, wherein: the starting material of mixed powder comprises a material of the composition Sr.sub.(1-x) Ba.sub.x TiO.sub.3 containing excess Ti to make a final molecular ratio of Ti to Sr.sub.(1-x) Ba.sub.x in the range of 0.95.ltoreq. Sr.sub.(1-x)Ba.sub.x /Ti

摘要翻译： 一种制造具有晶界绝缘结构的半导体型层叠陶瓷电容器的方法，包括在研磨，混合和干燥混合粉末之后，在空气或氮气气氛中煅烧混合粉末原料的步骤; 成型原料; 在原料片的表面上印刷内电极浆料的图案; 在空气中煅烧层压体; 煅烧后在还原气氛或氮气氛中烧结叠层原料片; 烧结后空气中再氧化; 并用外部电极膏覆盖烧结陶瓷片的边缘，再次氧化后烘烤，内部电极的端子暴露于边缘，其中：混合粉末的原料包含Sr（1-x）BaxTiO3 含有过量的Ti以使得在0.95

公开(公告)号：US5075818A

公开(公告)日：1991-12-24

申请号：US852222

申请日：1990-09-28

申请人： Iwao Ueno ,  Yasuo Wakahata ,  Kimio Kobayashi ,  Kaori Okamoto ,  Akihiro Takami

发明人： Iwao Ueno ,  Yasuo Wakahata ,  Kimio Kobayashi ,  Kaori Okamoto ,  Akihiro Takami

IPC分类号： C04B35/47 ,  H01G4/12

CPC分类号： H01G4/1281 ,  C04B35/47 ,  Y10T29/435

摘要： A semiconductor-type laminated ceramic capacitor with a grain boundary-insulated structure made of SrTiO.sub.3 as the main component, comprising the functions of a conventional capacitor which absorbs low voltage noises and high frequency noises, and a varistor when high voltage noises and electrostatic charges invade, wherein simultaneous sintering of the materials of the ceramic capacitor together with the materials of inner electrodes has been made possible in the manufacturing process. A material to be made semiconducting is added to the main component of SrTiO.sub.3 with an excess in Ti, the materials of Mn--Si, which are converted to MnO.sub.2 and SiO.sub.2 in the sintering process are also added to the main component.

摘要翻译： PCT No.PCT / JP90 / 00185 Sec。 371 1990年9月28日第 102（e）1990年9月28日PCT PCT 1990年2月16日提交PCT公布。 公开号WO90 / 09671 日期：1990年8月23日。一种具有以SrTiO3为主要成分的晶界绝缘结构的半导体型层叠陶瓷电容器，具有吸收低电压噪声和高频噪声的常规电容器的功能，以及变阻器 高电压噪声和静电电荷侵入，其中陶瓷电容器的材料与内部电极材料的同时烧结已经在制造过程中成为可能。 将半导体材料加入到具有过量Ti的SrTiO 3的主要成分中，在烧结过程中转化为MnO 2和SiO 2的Mn-Si的材料也被添加到主要组分中。