The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1993
Filed:
Jul. 28, 1992
Iwao Ueno, Ibaraki, JP;
Yasuo Wakahata, Katano, JP;
Kimio Kobayashi, Hirakata, JP;
Kaori Okamoto, Takatsuki, JP;
Akihiro Takami, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
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< 1.00 (where x is in the range of 0< x.ltoreq. 0.3); a first component of at least one or more kinds of the compounds selected from Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, V.sub.2 O.sub.5, W.sub.2 O.sub.5, Dy.sub.2 O.sub.5, Nd.sub.2 O.sub.3, Y.sub.2 O.sub.3, La.sub.2 O.sub.3, or CeO.sub.2 ; a second component of Mn and Si converted into MnO.sub.2 and SiO.sub.2 respectively; and an optional third component of at least one or more kinds of the compounds selected from Na.sub.2 SiO.sub.3, NaAlO.sub.2, Li.sub.2 SiO.sub. 3, LiAlO.sub.2, and Al.sub.2 O.sub.3.