Temperature sensor having a cover layer with aluminum oxide, silicon oxide, yttrium oxide and boron oxide
A temperature sensor includes a substrate, a platinum resistor arranged on at least one surface of the substrate, a protective layer covering at least a portion of the platinum resistor and a cover layer covering at least a portion of the protective layer, the cover layer including Al2O3, SiO2 and Y2O3. The cover layer may also include B2O3. A conductive wire may be electrically connected to the platinum resistor. A glass ceramic may be covering at least a portion of the conductive wire, platinum resistor, protective layer and cover layer.
1. A temperature sensor, comprising:
a substrate;
a platinum resistor arranged on the substrate;
a protective layer covering the platinum resistor; and
a cover layer covering the protective layer, the cover layer containing Al 2 O 3 and Si 2 O, wherein the cover layer also contains Y 2 O 3 and B 2 O 3 :
wherein the cover layer contains 30 to 70% by weight of Si 2 O; and
wherein the cover layer contains 1 to 20% by weight of B 2 O 3 .
2. The temperature sensor according to claim 1 , wherein the cover layer contains at least 5% by weight of Y 2 O 3 .
3. The temperature sensor according to claim 1 , wherein the cover layer contains at least 10% by weight of Y 2 O 3 .
4. The temperature sensor according to claim 1 , wherein the cover layer contains more Si 2 O by weight than Al 2 O 3 .
5. The temperature sensor according to claim 1 , wherein the cover layer contains more Al 2 O 3 by weight than Y 2 O 3 .
6. The temperature sensor according to claim 1 , wherein the cover layer contains less than 30% by weight of Y 2 O 3 .
7. The temperature sensor according to claim 1 , wherein the cover layer contains less than 20% by weight of Y 2 O 3 .
8. The temperature sensor according to claim 1 , wherein the cover layer contains 15 to 30% by weight of Al 2 O 3 .
9. The temperature sensor according to claim 1 , wherein the cover layer contains 20 to 25% by weight of Al 2 O 3 .
10. The temperature sensor according to claim 1 , wherein the cover layer contains 40 to 60% by weight of Si 2 O.
11. The temperature sensor according to claim 1 , wherein the cover layer contains 1 to 25% by weight of B 2 O 3 .
12. The temperature sensor according to claim 1 , wherein the cover layer contains less than 20% by weight of components that are not Al 2 O 3 , Si 2 O, Y 2 O 3 , nor B 2 O 3 .
13. The temperature sensor according to claim 1 , wherein the cover layer contains less than 10% by weight of components that are not Al 2 O 3 , Si 2 O, Y 2 O 3 , nor B 2 O 3 .
14. The temperature sensor according to claim 1 , wherein the cover layer is a glaze layer.
15. A temperature sensor, comprising,
a substrate;
a platinum resistor arranged on the substrate;
a protective layer covering the platinum resistor; and
a cover layer covering the protective layer, the cover layer containing Al 2 O 3 and Si 2 O, wherein the Si 2 O is 30 to 70% by weight, wherein the cover layer also contains Y 2 O 3 and contains 1 to 20% by weight of B 2 O 3 ;
wherein the cover layer protects the temperature sensor above 1000° C., the temperature sensor configured to measure temperatures up to 1200° C.
16. A temperature sensor, comprising:
a substrate;
a platinum resistor arranged on at least one surface of the substrate;
a protective layer covering at least a portion of the platinum resistor; and
a cover layer covering at least a portion of the protective layer, the cover layer comprising Al 2 O 3 , Si 2 O, Y 2 O 3 and B 2 O 3
wherein the cover layer contains 1 to 20% by weight of B 2 O 3 ;
wherein the cover layer contains 30 to 70% by weight of Si 2 O; and
wherein the cover layer protects the temperature sensor above 1000° C., the temperature sensor configured to measure temperatures up to 1200° C.
17. The temperature sensor of claim 16 , including a conductive wire electrically connected to the platinum resistor.
18. The temperature sensor of claim 17 , including a glass ceramic covering at least a portion of the conductive wire, platinum resistor, protective layer and cover layer.