Method of forming a high thermal conductivity composite dielectric material

Patent metadata

Field	Value
Publication number	US-11370711-B2
Application number	US-202017020774-A
Country	US
Kind code	B2
Filing date	Sep 14, 2020
Priority date	Mar 30, 2016
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

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.

First claim

What is claimed is:

1. A method of forming a composite ceramic material, the method comprising:
mixing together materials that will form out 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 materials forming the primary phase being generally non-reactive with materials forming the first and second secondary phases; and
sintering the materials to form a composite ceramic having the primary phase and the first and second secondary phases, the composite ceramic having a dielectric constant of greater than 20 and a thermal conductivity of greater than 20 W·m −1 ·K −1 .

2. The method of claim 1 wherein the composite ceramic has a thermal conductivity of greater than 30 W·m −1 ·K −1 .

3. The method of claim 1 wherein the primary phase is generally contiguous.

4. The method of claim 1 wherein the composite ceramic has a dielectric constant of greater than 25.

5. The method of claim 1 wherein the composite ceramic has a dielectric constant of greater than 35.

6. The method of claim 1 wherein the composite ceramic has a temperature drift of resonant frequency lower than 1000 ppm/Degree C.

7. The method of claim 1 further comprising machining the composite ceramic.

8. The method of claim 7 further comprising forming a radiofrequency component from the composite ceramic.

9. A method of forming a composite ceramic material, the method comprising:
mixing together materials that will form out a primary phase of aluminum oxide, a first secondary phase of CaTiO 3 located within the primary phase, and a second secondary phase of La 2 MgTiO 6 located within the primary phase, the materials forming the primary phase being generally non-reactive with materials forming the first and second secondary phases; and
sintering the materials to form a composite ceramic having the primary phase and the first and second secondary phases, the composite ceramic having a dielectric constant of greater than 20 and a thermal conductivity of greater than 20 W·m −1 ·K −1 .

10. The method of claim 9 wherein the composite ceramic has a thermal conductivity of greater than 30 W·m −1 ·K −1 .

11. The method of claim 9 wherein the primary phase is generally contiguous.

12. The method of claim 9 wherein the composite ceramic has a dielectric constant of greater than 25.

13. The method of claim 9 wherein the composite ceramic has a dielectric constant of greater than 35.

14. The method of claim 9 wherein the composite ceramic has a temperature drift of resonant frequency lower than 1000 ppm/Degree C.

15. A method of forming a composite ceramic material, the method comprising:
mixing together materials that will form out a 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 ; and
sintering the materials to form a composite ceramic having the primary phase and the plurality of secondary phases, the composite ceramic having a dielectric constant of greater than 20.

16. The method of claim 15 wherein the composite ceramic has a thermal conductivity of greater than 20 W·m −1 ·K −1 .

17. The method of claim 15 wherein the composite ceramic has a thermal conductivity of greater than 30 W·m −1 ·K −1 .

18. The method of claim 15 wherein the composite ceramic has a dielectric constant of greater than 25.

19. The method of claim 15 wherein the composite ceramic has a dielectric constant of greater than 35.

20. The method of claim 15 wherein the composite ceramic has a temperature drift of resonant frequency lower than 1000 ppm/Degree C.

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David

Classifications

• C04B2235/3255

  Niobates or tantalates, e.g. silver niobate · CPC title

• C04B2235/9607

  Thermal properties, e.g. thermal expansion coefficient · CPC title

• C04B2235/3236

  Alkaline earth titanates · CPC title

• C04B35/117 Primary

  Composites · CPC title

• C04B2235/3234

  Titanates, not containing zirconia · CPC title