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

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...

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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.

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