Sintered body for varistor, multilayer substrate using same, and production method for these
US-2016379738-A1 · Dec 29, 2016 · US
Varistor for high temperature applications
US10790075B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10790075-B2 |
| Application number | US-201916386564-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 17, 2019 |
| Priority date | Apr 17, 2018 |
| Publication date | Sep 29, 2020 |
| Grant date | Sep 29, 2020 |
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Abstract
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The present invention is directed to a varistor comprising a dielectric material comprising a sintered ceramic composed of zinc oxide grains and a grain boundary layer between the zinc oxide grains. The grain boundary layer contains a positive temperature coefficient thermistor material in an amount of less than 10 mol % based on the grain boundary layer.
First claim
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What is claimed is: 1. A varistor comprising: a dielectric material comprising a sintered ceramic composed of zinc oxide grains and a grain boundary layer between the zinc oxide grains, wherein the grain boundary layer contains a positive temperature coefficient thermistor material in an amount of less than 10 mol % based on the grain boundary layer. 2. The varistor according to claim 1 , wherein the grain boundary layer contains a positive temperature coefficient thermistor material in an amount of 5 mol % or less based on the grain boundary layer. 3. The varistor according to claim 1 , wherein the grain boundary layer contains a positive temperature coefficient thermistor material in an amount of from 0.1 mol % to 8 mol % based on the grain boundary layer. 4. The varistor according to claim 1 , wherein the grain boundary layer contains a positive temperature coefficient thermistor material in an amount of from 4 mol % to 6 mol % based on the grain boundary layer. 5. The varistor according to claim 1 , wherein the positive temperature coefficient thermistor material includes a titanate. 6. The varistor according to claim 5 , wherein the titanate includes a barium titanate. 7. The varistor according to claim 1 , wherein the positive temperature coefficient thermistor material includes an alkaline earth metal carbonate. 8. The varistor according to claim 7 , wherein the alkaline earth metal carbonate includes a calcium carbonate. 9. The varistor according to claim 1 , wherein the positive temperature coefficient thermistor material includes a rare earth metal oxide. 10. The varistor according to claim 9 , wherein the rare earth metal oxide includes a lanthanum oxide. 11. The varistor according to claim 1 , wherein the dielectric material includes a boron containing compound. 12. The varistor according to claim 11 , wherein the boron containing compound includes a boron containing acid. 13. The varistor according to claim 12 , wherein the boron containing acid includes boric acid. 14. The varistor according to claim 1 , wherein the varistor has a maximum operating temperature of from greater than 125° C. to 300° C. 15. The varistor according to claim 1 , wherein the varistor has a maximum operating temperature of from 150° C. to 250° C. 16. The varistor according to claim 1 , wherein the varistor has a maximum operating temperature of from 160° C. to 200° C. 17. The varistor according to claim 1 , wherein the varistor has a clamping voltage of from about 10 volts to about 200 volts. 18. The varistor according to claim 1 , wherein the varistor has a breakdown voltage of from about 10 volts to about 150 volts. 19. The varistor according to claim 1 , wherein the varistor has a leakage current of about 1 μA or less at an operating voltage of 18 volts. 20. The varistor according to claim 1 , wherein the varistor has a leakage current of from about 0.1 μA to about 0.6 μA at an operating voltage of 18 volts. 21. The varistor according to claim 1 , wherein the varistor has a capacitance of from about 0.1 pF to about 50,000 pF. 22. The varistor according to claim 1 , wherein the varistor has a capacitance of from about 250 pF to about 750 pF. 23. A method for forming the varistor of claim 1 , the method comprising forming the dielectric material by calcining a zinc oxide, and then mixing the calcined zinc oxide with the positive temperature coefficient thermistor material. 24. The method according to claim 23 , further comprising mixing a bismuth oxide after the calcining step.
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- What does patent US10790075B2 cover?
- The present invention is directed to a varistor comprising a dielectric material comprising a sintered ceramic composed of zinc oxide grains and a grain boundary layer between the zinc oxide grains. The grain boundary layer contains a positive temperature coefficient thermistor material in an amount of less than 10 mol % based on the grain boundary layer.
- Who is the assignee on this patent?
- Avx Corp
- What technology area does this patent fall under?
- Primary CPC classification H01C7/112. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Sep 29 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).