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Piezoelectric/electrostrictiven ceramic composition

A ceramic composition and stretching technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problems of easy deformation, low compactness, Problems such as piezoelectric properties cannot be obtained, and the effects of dense crystallinity and excellent piezoelectric/electrostrictive properties can be achieved

Inactive Publication Date: 2009-09-30
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These composition designs may be easily deformed due to the tolerance factor (Tolerance factor) calculated from the ionic radius, but in fact, since the perovskite structure is difficult to synthesize, sufficient piezoelectric properties cannot be obtained, and due to the dense It is not practical because of low insulation performance or low insulation performance caused by the volatilization of Bi element at high temperature.

Method used

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  • Piezoelectric/electrostrictiven ceramic composition
  • Piezoelectric/electrostrictiven ceramic composition
  • Piezoelectric/electrostrictiven ceramic composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] According to the following composition (formula (2)) weigh the PbO powder, Bi 2 o 3 powder, NiO powder, Nb 2 o 5 Powder, TiO 2 Powder, ZrO 2 Powder, wet mixed for 40 hours using a ball mill.

[0037] xBi(Ni 2 / 3 Nb 1 / 3 )O 3 —(1—x)Pb(Zr 1-y Ti y )O 3

[0038] x=0.20, y=0.625...(2)

[0039] The mixed powder was dried and pre-fired at 800°C for 2 hours in the air. Then, the powder that was pulverized and dried by a wet ball mill until a specific surface area was passed through a sieve was granulated, formed into a disk shape by a uniaxial press and a hydrostatic press, sealed in a ceramic shell, and carried out at 950°C. burnt.

[0040] The density of the sintered body was measured, and the microstructure and crystal structure were evaluated. In order to evaluate the electrical characteristics, the sintered body was cut into short strips with a thickness of 1 mm, Ag paste was coated on both sides, and fired at 600° C. to form electrodes....

Embodiment 2～12

[0043] By the same manufacturing method as Example 1, it produced with the composition shown in Table 1, and performed the same evaluation as Example 1. As a result, in any case, densification can be performed at 1000° C. or lower, and good piezoelectric characteristics can be obtained.

[0044]

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Abstract

A piezoelectric / electrostrictive ceramic composition is provided which exhibits high density and excellent crystallinity even in the case of firing under lower temperature conditions than in conventional cases, and which also exhibits excellent piezoelectric / electrostrictive properties. An ABO 3 compound (first main component) with Bi at the A site and with B1 and B2 elements at the B site (B1 consists of at least one kind of element having an ionic valence of two or less and selected from the group consisting of Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn, and rare-earth elements; and B2 consists of at least one kind of element having an ionic valence of four or more and selected from the group consisting of V, Nb, Ta, Sb, Mo, and W) is dissolved in the form of a solid solution into another ABO 3 compound (second main component) with at least Pb at the A site.

Description

technical field [0001] This invention relates to piezoelectric / electrostrictive ceramic compositions. Background technique [0002] For piezoelectric / electrostrictive elements used in injectors for diesel engines, etc., Ag / Pd-based electrodes are used as the inner layer electrodes from the viewpoint of cost. Since Ag / Pd-based electrodes have a low melting point, lower firing temperatures are required for piezoelectric / electrostrictive ceramics. Specifically, there is a need for piezoelectric / electrostrictive ceramic compositions that densify at firing temperatures of less than 1000°C. On the other hand, the lowering of the firing temperature by using a sintering aid has been studied. However, since the sintering aid is used, there is a problem that the original piezoelectric / electrostrictive properties are lowered. [0003] Patent Document 1 discloses the general formula) xBiMeO 3 -yPbZrO 3 -(1-x-y)PbTiO 3 Substances represented by (Me:Sc and / or In). In addition, in P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01H01L41/187C04B35/472C04B35/491H01L41/22H01L41/39
Inventor 日比野朝彦小泉贵昭
Owner NGK INSULATORS LTD
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