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:
Apr. 20, 1993
Filed:
Jan. 30, 1992
Osaka Titanium Co., Ltd., Hyogo, JP;
Abstract
A powder of oxide which is a material for dielectric ceramics including perovskite-type double oxide containing lead, and a process for producing dielectric ceramics using the powder. In the process of this invention, perovskite-type double oxide containing lead are initially produced by means of hydrothermal reaction, and the powder is heat-treated at 500.degree. to 1000.degree. C. Consequently, the specific surface area of the powder becomes 20 m.sup.2 /g or less. The powder is mixed with binder and compressed, molded and debinded, and consequently, the compact attains 50% or more of theoretical density. Thereafter, the compact is sintered. As a result, the process of manufacture according to the present invention is capable of producing dielectric ceramics, wherein deformation and cracks do not occur.