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Magnesium titanate bismuth-lead titanate piezoelectric ceramics suitable for high-temperature field

A technology of bismuth magnesium titanate and piezoelectric ceramics, applied in the field of ceramic compositions, can solve problems such as unreachable degree, and achieve the effects of reducing dielectric loss, improving Curie temperature, piezoelectric performance, and excellent comprehensive performance

Inactive Publication Date: 2010-10-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lead-free ceramics have become a research hotspot in the world, due to their limitations in piezoelectric ferroelectric properties, they are far from being able to replace the current mainstream PZT piezoelectric ceramic system.

Method used

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  • Magnesium titanate bismuth-lead titanate piezoelectric ceramics suitable for high-temperature field
  • Magnesium titanate bismuth-lead titanate piezoelectric ceramics suitable for high-temperature field
  • Magnesium titanate bismuth-lead titanate piezoelectric ceramics suitable for high-temperature field

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] Embodiment 1: x=0.36, α=0, formula is 0.64Bi (Mg 1 / 2 Ti 1 / 2 )O 3 -0.36PbTiO 3 ;

Embodiment 2

[0034] Embodiment 2: x=0.38, α=0, formula is 0.62Bi (Mg 1 / 2 Ti 1 / 2 )O 3 -0.38PbTiO 3 ;

Embodiment 3

[0035] Embodiment 3: x=0.40, α=0, formula is 0.60Bi (Mg 1 / 2 Ti 1 / 2 )O 3 -0.40PbTiO 3 ;

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Abstract

The invention discloses a magnesium titanate bismuth-lead titanate piezoelectric ceramics suitable for a high-temperature field, belonging to perovskite structure piezoelectric ceramics. The invention can be represented by the general formula: (1-x)Bi(Mg1 / 2Ti1 / 2)O3-xPbTiO3+alphaMnO2(mol%), wherein x=0.32-0.42, x represents the molar percent of PbTiO3, alpha=0-2 mol%, and the alpha is the molar percent for MnO2 to account for the raw material total amount; MnO2 is a doped metallic oxide and can lower the loss factor of the piezoelectric ceramics. The piezoelectric ceramics is prepared by the traditional piezoelectric ceramics preparation technology, lead tolerance is lower than 42 mol%; d33 can be kept at 170 pC / N at the temperature of 350 DEG C; and after MnO2 is doped, Curie temperature Tc can be 520 DEG C, d33 is 120 pC / N, and the loss factor tan delta is lowered to 0.018. The invention has huge high-temperature application potential and practical application value.

Description

technical field [0001] The invention relates to a ceramic composition characterized by components, in particular to a bismuth titanate-lead titanate piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are widely used in many fields such as communications, home appliances, aviation, detection and computers, and are an important class of functional materials. In the past 10 years, with the rapid development of science and technology, many electronic and electrical equipment have higher and higher requirements for the selected piezoelectric devices. The range of use and the use environment require piezoelectric materials to have greater adaptability. The application of piezoelectric devices has become a top priority, such as: ultrasonic applications of high-temperature objects, vibration of high-temperature objects, measurement of acceleration and pressure must use high-temperature piezoelectric materials. Both the autom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475
Inventor 马卫兵张林孙清池刘涛王耐清
Owner TIANJIN UNIV
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