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Piezoceramic material, piezoelectric element and non-resonance knock sensor

A piezoelectric sensor, piezoelectric ceramic technology, applied in piezoelectric devices/electrostrictive devices, electrical components, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the problem of not displaying temperature characteristics

Active Publication Date: 2013-08-14
NGK SPARK PLUG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, considering the fact that piezoelectric sensors are used under severe conditions such as in automobile engines, it is desirable that piezoelectric elements do not show changes in temperature characteristics over a wide temperature range

Method used

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  • Piezoceramic material, piezoelectric element and non-resonance knock sensor
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  • Piezoceramic material, piezoelectric element and non-resonance knock sensor

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Embodiment Construction

[0021] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0022] A piezoelectric ceramic material (hereinafter simply referred to as "piezoelectric ceramic material") according to an exemplary embodiment of the present invention is PZT (PbTiO 3 -PbZrO 3 )ceramics.

[0023] When the tetragonal ferroelectric material PbTiO 3 Zr was substituted for Ti until the amount of Zr in the resulting PZT solid solution reached about 53 mol%, and the crystal structure of the material changed to a rhombohedral structure. This boundary, where the crystal structure of the material changes with composition, is called a metaisomorphic phase boundary (MPB). It is known that the piezoelectricity of the PZT material becomes maximum near the quasi-isomorphic phase boundary, but the stability of the PZT material deteriorates near the quasi-isomorphic phase boundary to cause a large change in capacitance Cp with respect to temperature.

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Abstract

The invention relates to piezoceramic material, a piezoelectric element and non-resonance knock sensor. A piezoceramic material according to an embodiment of the present invention has a composition represented by Pb n [Zr 1-x-y-z Ti x Sn y (Sb 1-n Nb n ) z ]O 3 where 1.000<=m<=1.075, 0.470<=x < 0.490, 0.020<=y<=0.040, 0 < n < 1.000 and 0 < z<= 0.025 and a crystallite size of 30 to 39 nm.

Description

technical field [0001] The present invention relates to piezoelectric ceramic materials suitable for use in piezoelectric sensors such as pressure sensors, acceleration sensors, knock sensors, yaw rate sensors, gyroscope sensors and vibration sensors and other piezoelectric devices, and to the use of the piezoelectric A piezoelectric element made of a ceramic material and a non-resonant type knock sensor using the piezoelectric element. Background technique [0002] Various piezoelectric sensors have been widely used in electronics and electromechanical fields. Each piezoelectric sensor includes a piezoelectric element equipped with a sintered piezoelectric ceramic body (block) and at least a pair of element electrodes so that mechanical stress applied thereto is converted into current or voltage by the piezoelectric effect of the piezoelectric ceramic body, And generate an electrical signal based on the converted current or voltage. Since the piezoelectric characteristics...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/08H01L41/16C04B35/49C04B35/495B82Y10/00B82Y15/00B82Y30/00C04B35/493G01L23/22H01L41/187H01L41/257H01L41/39
Inventor 山崎正人平光秀明堀口学浜口幸弘山际胜也光冈健大林和重俵良太郎平田智大
Owner NGK SPARK PLUG CO LTD
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