High-frequency porcelain composition, process for producing...

Compositions: ceramic – Ceramic compositions – Refractory

Reexamination Certificate

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C501S134000, C428S450000, C428S702000

Reexamination Certificate

active

07368407

ABSTRACT:
A sintering temperature can be lowered to 1,200° C. by adding from 15% by weight or more to 35% by weight or less of rutile-type titanium dioxide into forsterite. By carrying out sintering at such a low temperature, a sintered product can be obtained in which sintering was carried out while retaining the respective crystal phases of the forsterite and rutile-type titanium dioxide. Such a sintered product is an excellent high-frequency ceramic composition, wherein the high quality factor Q·f value derived from forsterite is hardly impaired, and, the absolute value of the temperature coefficient τfis controlled to 30 ppm/° C. or less by rutile-type titanium dioxide.

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patent: 6136734 (2000-10-01), Jean et al.
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patent: 2000-344571 (2000-12-01), None
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patent: 2002-104870 (2002-04-01), None
patent: 275192 (1971-02-01), None

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