Dielectric glass-ceramic composition, dielectric glass-ceramic substrate and manufacturing method thereof

Abstract

A dielectric glass-ceramic substrate composed of a dielectric glass-ceramic composition is disclosed. The dielectric glass-ceramic composition includes a ceramic material and a Ba—B—Si glass material. Also, a method of manufacturing a dielectric glass-ceramic substrate includes steps of: mixing a ceramic material and a Ba—B—Si glass material with an organic carrier, forming the ceramic material, the Ba—B—Si glass material and the organic carrier as a pre-mold; and firing the pre-mold to form the dielectric glass-ceramic substrate at a low temperature.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will become more fully understood from the detailed description given herein below illustration only, and thus is not limitative of the present invention, and wherein:

FIG. 1 is a schematic cross-sectional view showing a substrate used in a conventional high-frequency wireless communication element; and

FIG. 2 is a flow chart showing a method of manufacturing a dielectric glass-ceramic substrate according to a preferred embodiment of the invention.

Claims

1. A dielectric glass-ceramic composition, comprising: a ceramic material and a Ba—B—Si glass material.

2. The composition according to claim 1, wherein a weight percentage of the ceramic material is ranged from 45% to 75%, and a weight percentage of the Ba—B—Si glass material is ranged from 25% to 55%.

3. The composition according to claim 2, wherein the ceramic material is strontium titanate ceramics.

4. The composition according to claim 1, wherein the ceramic material is a commercial dielectric ceramic powder with a dielectric constant ranged from 30 to 40.

5. The composition according to claim 4, wherein a weight percentage of the ceramic material is ranged from 70% to 80%, and a weight percentage of the Ba—B—Si glass material is ranged from 20% to 30%.

6. The composition according to claim 1, wherein the Ba—B—Si glass material includes 0 wt % to 10 wt % of barium, 70 wt % to 80 wt % of boron oxide, 10 wt % to 20 wt % of silicon oxide and 0 wt % to 5 wt % of potassium oxide.

7. The composition according to claim 1, wherein the composition at a frequence of 1 MHz has a dielectric constant (ε) ranged from 9 to 33.

8. The composition according to claim 1, wherein the composition at a frequence of 1 MHz has a quality factor (Q) ranged from 400 to 6000.

9. A dielectric glass-ceramic substrate composed of a dielectric glass-ceramic composition, wherein the dielectric glass-ceramic composition comprises a ceramic material and a Ba—B—Si glass material.

10. The substrate according to claim 9, wherein the substrate further comprises an organic carrier, which is mixed with the ceramic material and the Ba—B—Si glass material.

11. The substrate according to claim 10, wherein the organic carrier includes a binder, an organic solvent and a plasticizer.

12. The substrate according to claim 10, wherein the binder is Polyethylene Glycol, Polyvinyl Butyral or Polyvinyl Alcohol.

13. The substrate according to claim 10, wherein the organic solvent is 1-Propyl Alcohol, Toluene or Ethanol.

14. The substrate according to claim 10, wherein the plasticizer is Dibutyl Phthalate.

15. The substrate according to claim 9, wherein the substrate is a low temperature co-fired ceramics substrate (LTCC), and the low temperature co-fired ceramics substrate is co-fired at a sintering temperature is lower than 962° C.

16. A method of manufacturing a dielectric glass-ceramic substrate, the method comprising steps of: mixing a ceramic material and a Ba—B—Si glass material with an organic carrier;forming the ceramic material, the Ba—B—Si glass material and the organic carrier as a pre-mold; andfiring the pre-mold to form the dielectric glass-ceramic substrate at a low temperature.

17. The method according to claim 16, wherein the pre-mold are formed by drying for about one hour and pressing.

18. The method according to claim 16, wherein the step of firing the pre-mold at the low temperature comprises a grease removing stage and a sintering stage.

19. The method according to claim 16, wherein after the step of firing at the low temperature, the method further comprises a step of: testing the dielectric glass-ceramic substrate.

20. The method according to claim 19, wherein in the step of testing the dielectric glass-ceramic substrate, a LCR meter is used in measuring a low-frequency property of the composition at a frequence of 1 MHz, and a Hakki and Coleman method is used in measuring a dielectric constant and a quality factor of the composition.