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Method for producing piezoelectric ceramic

A technology of piezoelectric ceramics and manufacturing methods, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, circuits, piezoelectric/electrostrictive/magnetostrictive devices, etc., to achieve the effect of improving toughness and realizing processing speed

Inactive Publication Date: 2012-01-25
TDK CORPARATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Method for producing piezoelectric ceramic
  • Method for producing piezoelectric ceramic
  • Method for producing piezoelectric ceramic

Examples

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Embodiment 1

[0084] As starting materials, lead oxide (PbO) powder, titanium oxide (TiO 2 ) powder, zirconia (ZrO 2 ) powder, manganese carbonate (MnCO 3 ) powder, niobium oxide (Nb 2 o 3 ) powder, alumina (Al 2 o 3 )powder. This raw material powder was weighed to obtain the compositions shown in Tables 1 to 4, and wet-mixed in pure water for 0.5 hours with a ball mill (using Zr balls).

[0085] After the obtained slurry is fully dried and press-formed, it is pre-fired at 800-950°C in the air. Next, after finely pulverizing the calcined body to an average particle diameter of 0.7 μm by a ball mill, the finely pulverized powder was dried. An appropriate amount of PVA (polyvinyl alcohol) was added as a binder to the dried finely pulverized powder, and the mixture was granulated.

[0086] About 3g of granulated powder is dropped into a metal mold cavity with a length of 20mm×a width of 20mm, and is formed with a pressure of 245MPa by a uniaxial press molding machine. The...

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Abstract

Provided is a method for producing a piezoelectric ceramic which can improve toughness thereof. Provided is a method for producing a piezoelectric ceramic which includes a step of polarizing a piezoelectric ceramic having a main component represented by a composition formula Pba[(MnbNbc)dTieZrf]O3, wherein a to f satisfy 0.98<=a<=1.01, 0.340<=b<=0.384, 0.616<=c<=0.660, 0.08<=d<=0.12, 0.500<=e<=0.540, 0.37<=f<=0.41, and bd+cd+e+f=1, and 1 to 10% by weight of Al in terms of Al2O3 as an additive, and heat-treating the polarized piezoelectric ceramic for 10 to 60 minutes in a range of 200 to 300 DEG C. As a result of this heat treatment, toughness of the piezoelectric ceramic can be improved.

Description

technical field [0001] The present invention relates to a manufacturing method of piezoelectric ceramics, in particular to a manufacturing method including heat treatment for improving toughness. Background technique [0002] Piezoelectric ceramics are widely used as materials for piezoelectric elements such as resonators, filters, brakes, ignition elements, and ultrasonic motors. Most of the piezoelectric ceramics in practical use today are composed of ferroelectric materials, and the ferroelectric materials constitute PZT (PbZrO 3 -PbTiO 3 solid solution) system, and PT(PbTiO 3 solid solution) system and other perovskite structures. [0003] However, in recent years, along with the miniaturization of electronic devices including communication equipment, surface mounting has rapidly progressed. For surface mounting, temporarily mount the piezoelectric element on the substrate by soldering. It is not desirable that the characteristics (for example, resonance frequency, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462H01L41/187C04B35/493H03H3/02H10N30/01H10N30/04H10N30/045H10N30/093H10N30/853
CPCC04B2235/3251C04B2235/5445C04B2235/96C04B35/493C04B2235/3262C04B2235/3217C04B2235/658C04B35/6262C04B2235/662H10N30/8554H10N30/045
Inventor 寺西惠介东智久广濑正和
Owner TDK CORPARATION
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