Ceramic material and piezoelectric element using the same

A ceramic material, piezoelectric strain constant technology, applied in electrical components, piezoelectric/electrostrictive/magnetostrictive devices, device material selection, etc., can solve the problem of small dielectric loss dissipation coefficient, unknown piezoelectric materials and other problems, to achieve the effect of excellent piezoelectric properties and less self-heating

Inactive Publication Date: 2004-03-24
DIESEL KIKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, piezoelectric materials that can be sintered at temperatures below 1120°C and exhibit excellent piezoelectric properties have not been reported so far.
[0011] On the other hand, even in a state where the Curie temperature Tc is high, the elongation when an applied voltage is applied, especially the longitudinal piezoelectric strain constant d 33 Piezoelectric materials that are also higher than in the past and have a small dissipation coefficient tanδ that represents dielectric loss have not been known so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Will be made of PbO, ZrO 2 、TiO 2 , ZnO, CoO, NiO and Nb 2 o 5 , and La 2 o 3 or K 2 CO 3 The raw material powder that constitutes, in meeting the Pb 1-a m 1 a-b [(M 21 / 3 Nb 2 / 3-c ) α Zr β Ti γ ]O d According to the composition formula of the condition of , weigh according to the specified ratio shown in Table 1, and use a ball mill to fully wet mix the raw material powder.

[0098]

[0099] m 1 : Sample 9 used K. La was used for other samples 1-8 and 10-16.

[0100] m 2 : Sample 4 used Sr, Ni, and Zn. In other samples 1-3 and 5-16, Co, Ni, and Zn were used.

[0101] Next, the obtained mixed powder was calcined at 900° C. for 2 hours in the air, and then wet pulverized using a ball mill.

[0102] After mixing 2% by weight of an organic binder (polyvinyl alcohol) to the powder pulverized as above, a powder was obtained by passing through a mesh of 150 μm. The obtained powder was compression-molded into a disc shape with a diameter of 20 mm and a t...

Embodiment 2

[0123] Will be made of PbO, ZrO 2 、TiO 2 , ZnO, CoO, NiO and Nb 2 o 5 , and La 2 o 3 or K 2 CO 3 The raw material powders to be constituted were weighed at a predetermined ratio shown in Table 2 under the composition formula satisfying the following conditions, and the raw material powders were fully wet-mixed using a ball mill.

[0124] Pb x m 3 1-x [(M 4 1 / 3 Nb 2 / 3 ) e (Co 1 / 3 Nb 2 / 3 ) f (Zn 1 / 3 Nb 2 / 3 ) g Zr h Ti i ]O 3

[0125]

[0126] m 3 : Sample 17-33 used La. Sample 33 uses K.

[0127] m 4 : Ni was used in all samples.

[0128] Next, the obtained mixed powder was calcined under the same conditions as in Example 1, and then wet pulverized using a ball mill.

[0129] The above pulverized powder was fired in the same manner as in Example 1 to form electrodes, and a voltage was applied to separate them. Table 2 shows the results of measuring the piezoelectric characteristics of the respective ceramic materials after 24 hours or more have ela...

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Abstract

A ceramic material having piezoelectric characteristics that can be sintered at low temperature and is suited to various piezoelectric devices. The ceramic material is denoted by the general formula ABOd comprised primarily of Pb, Zr, and Ti; in which A denotes (Pb1-aM<1>a-b) and B denotes (M<2>1 / 3Nb2 / 3-c) alpha Zr beta Ti gamma or the formula PbxM<3>1- x(M<4>1 / 3Nb2 / 3)e(Co1 / 3Nb2 / 3 )f(Zn1 / 3Nb2 / 3)gZrhTiO3. The ceramic material can be prepared by sintering at a temperature of 950 DEG C or below and has good piezoelectric characteristics, and in particular, good longitudinal elongation (d33) and a low dielectric loss factor (tan delta ) even at a high Curie temperature Tc; as well as the ceramic material has a good electromechanical coupling factor (Kp).

Description

technical field [0001] The present invention relates to a ceramic material having low-temperature firing piezoelectric properties suitable for various piezoelectric materials such as piezoelectric actuators (piezoelectric actuators, piezoelectric actuators; piezoelectric actuators). In addition, the present invention relates to a piezoelectric element and a multilayer piezoelectric element having piezoelectric properties and having members and electrodes made of a low-temperature-fireable ceramic material. Background technique [0002] In recent years, piezoelectric laminated ceramics, which integrate piezoelectric ceramics and metal laminates forming internal electrodes or external electrodes, have been used for color inkjet control of inkjet printers and ordinary line (commonle-ru) fuel injection control of diesel engines. Piezoelectric actuators and piezoelectric transformers began to be used. For such piezoelectric laminated ceramics, the elongation (d 33 ) is large, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/491C04B35/493H01L41/187
CPCC04B2235/3239C04B2235/3206C04B2235/3201C04B2235/3284H01L41/187C04B2235/3229C04B35/493C04B2235/3208C04B2235/3251C04B2235/3213C04B2235/77C04B35/491C04B2235/3227C04B2235/3279C04B2235/3203C04B2235/764C04B2235/3262C04B2235/3272C04B2235/3224C04B2235/3225C04B2235/3275H10N30/8554C04B35/49H10N30/853
Inventor 粕川和久大野和俊
Owner DIESEL KIKI CO LTD
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