Powder of oxide for dielectric ceramics and a process for produc

Details Powder of oxide for dielectric ceramics and a process for produc Powder of oxide for dielectric ceramics and a process for produc

1992-01-30

1993-04-20

Bell, Mark L.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, 252 629, 423593, 423598, 501134, 501135, 501136, C04B 3546

Patent

active

052040313

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.

REFERENCES:
patent: 3352632 (1967-11-01), Sasaki
patent: 3725298 (1973-04-01), Woodhead et al.
patent: 3963630 (1976-06-01), Yonezawa et al.
patent: 4874598 (1989-10-01), Oda et al.
Thomson, Jr., "Chemical Preparation of PLZT Powders From Aqueous Nitrate Solutions," American Ceramic Society Bulletin, vol. 53, No. 5 pp. 421-424, 433, May 1974.
Kutty et al., "Direct Precipitation Of Lead Zirconate Titanate By The Hydrothermal Method", Mat. Res. Bulletin, vol. 19, pp. 1479-1488, Aug. 1984.

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