Barium oxide-rare earth oxide-titanium dioxide based ceramics ex

Details Barium oxide-rare earth oxide-titanium dioxide based ceramics ex Barium oxide-rare earth oxide-titanium dioxide based ceramics ex

1994-05-12

1997-04-15

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 65, 264 66, 26417711, 501139, C04B 35465

Patent

active

056206380

ABSTRACT:
Ceramics resulting from the oxide system barium oxide-rare earth oxide-titanium oxide have been found to exhibit an isotropy with respect to electrical properties such as the temperature coefficient of frequency at the first resonant frequency, dielectric constant, and, to some extent, the loss factor, Q. Such anisotropy effects reproducibility in fabricating ceramic articles for use in the microwave region and in the performance of these articles. Isotropic ceramics from the same ternary oxide system can be made by compacting non-nucleated powders followed by the usual sintering of the green compact. Anisotropic bulk ceramic workpieces can be machined to reproducibiy afford ceramic articles with the appropriate value of the electrical property in question by measuring the components of the electrical property along the three principal axes of the workpiece, and then determining the angles between the principal axes necessary to give a resultant having the preselected value.

REFERENCES:
patent: 3956440 (1976-05-01), Deshamps
patent: 4330631 (1982-05-01), Kawashima et al.
patent: 4525767 (1985-06-01), Alexander

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