Multi-phase high thermal conductivity composite dielectric materials
Disclosed herein are embodiments of materials having high thermal conductivity along with a high dielectric constants. In some embodiments, a two phase composite ceramic material can be formed having a contiguous aluminum oxide phase with a secondary phase embedded within the continuous phase. Example secondary phases include calcium titanate, strontium titanate, or titanium dioxide.
1. A multi-phase composite ceramic material, the material comprising:
a primary phase of aluminum oxide;
a first secondary phase of CaTiO 3 located within the primary phase; and
a second secondary phase of LaAlO 3 located within the primary phase, the first secondary phase and the second secondary phase forming a multi-phase composite, the multi-phase composite having a dielectric constant of greater than 20 and a thermal conductivity of greater than 20 W·m −1 ·K −1 .
2. The multi-phase composite ceramic material of claim 1 wherein the primary phase is generally contiguous.
3. The multi-phase composite ceramic material of claim 1 wherein the multi-phase composite has a dielectric constant of greater than 25.
4. The multi-phase composite ceramic material of claim 1 wherein the thermal conductivity is greater than 30 W·m −1 ·K −1 .
5. The multi-phase composite ceramic material of claim 1 wherein the multi-phase composite has a temperature drift of resonant frequency lower than 1000 ppm/Degree C.
6. A multi-phase composite ceramic material, the material comprising:
an aluminum oxide phase;
a first secondary phase of CaTiO 3 located within the aluminum oxide phase; and
a second secondary phase of La 2 MgTiO 6 located within the aluminum oxide phase forming a multi-phase composite, the multi-phase composite having a dielectric constant of greater than 20 and a thermal conductivity of greater than 30 W·m −1 ·K −1 .
7. A multi-phase composite ceramic material comprising at a generally contiguous primary phase of aluminum oxide and a plurality of secondary phases, a first of the plurality of secondary phases being CaTiO 3 and a second of the plurality of secondary phases being selected from the group consisting of LaAlO 3 , La 2 MgTiO 6 , YAlO 3 , SmAlO 3 , Mg 4 Nb 2 O 9 , and La 4 Ti 3 O 12 , the plurality of secondary phases embedded within the primary phase to form a multi-phase composite ceramic material having a dielectric constant of greater than 20.
8. The multi-phase composite ceramic material of claim 7 wherein the multi-phase composite ceramic material has a thermal conductivity of greater than 20 W·m −1 ·K −1 .
9. The multi-phase composite ceramic material of claim 6 wherein the aluminum oxide phase is generally contiguous.
10. The multi-phase composite ceramic material of claim 6 wherein the multi-phase composite ceramic material has a dielectric constant of greater than 25.
11. The multi-phase composite ceramic material of claim 6 wherein the multi-phase composite ceramic material has a dielectric constant of greater than 35.
12. The multi-phase composite ceramic material of claim 6 wherein the multi-phase composite ceramic material has a temperature drift of resonant frequency lower than 1000 ppm/Degree C.
13. The multi-phase composite ceramic material of claim 7 wherein the multi-phase composite ceramic material has a thermal conductivity of greater than 30 W·m −1 ·K −1 .
14. The multi-phase composite ceramic material of claim 7 wherein the primary phase is contiguous.
15. The multi-phase composite ceramic material of claim 7 wherein the multi-phase composite ceramic material has a dielectric constant of greater than 25.
16. The multi-phase composite ceramic material of claim 1 wherein the multi-phase composite ceramic material has a dielectric constant of greater than 35.
17. The multi-phase composite ceramic material of claim 1 further including Mg 4 Nb 2 O 9 .
18. The multi-phase composite ceramic material of claim 1 further including La 4 Ti 3 O 12 .
19. The multi-phase composite ceramic material of claim 7 wherein the ceramic material includes YAlO 3 .
20. The multi-phase composite ceramic material of claim 7 wherein the ceramic material includes SmAlO 3 .