Ceramics and method of preparing the same
AssigneeKYOCERA Corporation
InventorsYoshitake Terashi, Hiromi Iwachi, Tsutae Iryo
Life of this patent
Estimating the term…
Abstract
Ceramics containing a diopside crystal phase and a cordierite phase, the remainder being a glass phase and/or other ceramic crystal phases, and having an open porosity of not larger than 1%. The ceramics is obtained by firing at from 800 to 1050° C., and exhibits a dielectric constant of not larger than 7 and a small dielectric loss in a high-frequency region, a ceramic strength of not smaller than 250 MPa, and a coefficient of thermal expansion close to those of the chips such as of Si and Ga—As and of the printed board.
Claims15
A ceramic comprising:
- a diopside crystal phase, a cordierite crystal phase, and at least one phase selected from the group consisting of a glass phase and other ceramic crystal phases, the ceramic having an open porosity of not larger than 1%, wherein the total content of said diopside crystal phase and said cordierite crystal phase is not smaller than 50% by weight.
A method of preparing ceramics comprising:
- preparing a mixed powder containing a first glass powder capable of precipitating a diopside crystal phase and a second glass powder capable of precipitating a cordierite crystal phase;
- molding said mixed powder;
- and
- firing the obtained molded article at a temperature of from 800 to 1050° C., so that the diopside crystal phase and the cordierite crystal phase are precipitated from the first and second glasses, respectively.
A wiring board comprising an insulating substrate provided with a wiring layer, said insulating substrate being formed of a ceramic comprising:
- a diopside crystal phase, a cordierite crystal phase, and at least one phase selected from the group consisting of a glass phase and other ceramic crystal phases, the ceramic having an open porosity of not larger than 1%.
A ceramic comprising:
- a diopside crystal phase and a cordierite crystal phase, the ceramic having an open porosity of not larger than 1%, wherein the total content of said diopside crystal phase and said cordierite crystal phase is not smaller than 50% by weight.
Dependencies are inferred from the claim text.