Piezoelectric component, sensor, and actuator
A piezoelectric component that has a piezoelectric element including a piezoelectric ceramic layer and a sintered metal layer on at least a first main surface of the piezoelectric ceramic layer and containing a non-precious metal, and a protective layer containing an elastic body covering first and second opposed main surfaces of the piezoelectric element. The piezoelectric ceramic layer contains 90 mol % or more of a perovskite compound that contains niobium, an alkali metal, and oxygen. A thickness of the piezoelectric element is 100 μm or less.
1. A piezoelectric component comprising:
a piezoelectric element including a piezoelectric ceramic layer and a sintered metal layer on at least a first main surface of the piezoelectric ceramic layer, the sintered metal layer containing a non-precious metal; and
a protective layer containing an elastic body covering first and second opposed main surfaces of the piezoelectric element,
wherein the piezoelectric ceramic layer contains 90 mol % or more of a perovskite compound that contains niobium, an alkali metal, and oxygen, and
wherein a thickness of the piezoelectric element is 100 μm or less.
2. The piezoelectric component according to claim 1 , wherein the elastic body contains at least one material selected from polyethylene terephthalate, polybutylene terephthalate, polyethylene, vinyl chloride, polypropylene, polystyrene, acrylic resin, ABS resin, polyamide, polycarbonate, polylactic acid, Teflon®, silicone, and urethane.
3. The piezoelectric component according to claim 1 , wherein the non-precious metal is a metal containing at least one of nickel, copper, and aluminum.
4. The piezoelectric component according to claim 1 , wherein the protective layer covers an end surface of the piezoelectric element.
5. The piezoelectric component according to claim 1 , wherein the elastic body has a Young's modulus of 0.05 GPa to 8 GPa.
6. The piezoelectric component according to claim 1 , wherein the thickness of the protective layer is 10 cm or less.
7. The piezoelectric component according to claim 1 , wherein the elastic body has an Asker C hardness of 5 to 150.
8. An actuator comprising the piezoelectric component according to claim 1 .
9. A sensor comprising the piezoelectric component according to claim 1 .
10. The piezoelectric component according to claim 1 , further comprising a reinforcing member on a surface of the protective layer opposite to a surface of the protective layer in contact with the piezoelectric element.
11. The piezoelectric component according to claim 10 , wherein the reinforcing member contains at least one material selected from carbon fiber, glass fiber, cellulose fiber, and metal fiber.
12. The piezoelectric component according to claim 1 , wherein a thickness of the protective layer is three times or more a total thickness of the sintered metal layer and the piezoelectric ceramic layer.
13. The piezoelectric component according to claim 12 , wherein the thickness of the protective layer is 10 cm or less.
14. The piezoelectric component according to claim 1 , further comprising a conductive wire electrically connected to the piezoelectric element.
15. The piezoelectric component according to claim 14 ,
wherein the conductive wire is connected to the piezoelectric element by a conductive adhesive, and
wherein the conductive adhesive contains an epoxy-based or silicone-based resin containing a conductive filler.
16. The piezoelectric component according to claim 14 ,
wherein the conductive wire is connected to the piezoelectric element by a conductive adhesive, and
wherein the conductive adhesive contains solder and a thermosetting resin.
17. The piezoelectric component according to claim 14 , further comprising a conductive sheet interposed between the conductive wire and the piezoelectric element.
18. The piezoelectric component according to claim 17 ,
wherein the conductive sheet is connected to the piezoelectric element by a conductive adhesive, and
wherein the conductive adhesive contains an epoxy-based or silicone-based resin containing a conductive filler.
19. The piezoelectric component according to claim 17 , wherein the conductive wire is connected to the piezoelectric element at a position where the piezoelectric element and the conductive wire do not overlap each other in a direction perpendicular to a main surface of the piezoelectric component.
20. The piezoelectric component according to claim 17 ,
wherein the conductive sheet is connected to the piezoelectric element by a conductive adhesive, and
wherein the conductive adhesive contains solder and a thermosetting resin.