Ta-doped potassium sodium niobate-based piezoelectric ceramic material and preparation method thereof

A potassium niobate-based, piezoelectric ceramic technology, applied in the field of functional ceramic materials, can solve the problems of shortening the time, the effect is not particularly good, and there is no research on the density of ceramics, and achieves low reaction temperature, short time, and high heat energy utilization. high effect
CN110845236AActive Publication Date: 2020-02-28夏璐
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
夏璐
Publication Date
2020-02-28

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Abstract

The invention provides a Ta-doped potassium sodium niobate-based piezoelectric ceramic material and a preparation method thereof. The general formula of the piezoelectric ceramic is Na<0.5>K<0.5>Nb<1-y>Ta<y>O<3>, wherein y is greater than or equal to 0.11 and less than or equal to 0.2; the invention discloses a preparation method of the piezoelectric ceramic material. The preparation method comprises the following steps: carrying out microwave hydrothermal synthesis of Na0.5K0.5Nb1-yTayO3 powder; taking a 7mol / L mixed alkali liquor of NaOH and KOH as a solvent, taking Nb2O5 and Ta2O5 as reactants, wherein the ratio of Na+ to K+ is 1: 1 6, the adding total amount of Nb2O5 and Ta2O5 to the mass molar ratio of the solvent is 1: 8-1: 12, the mass molar ratio of Nb2O5 to Ta2O5 is 8: 1-4: 1, theadding amount of a dispersing agent is 1.5 wt%, the microwave reaction temperature is 160-180 DEG C, and the reaction time is 2-4 hours. The invention also discloses a preparation method for preparing piezoelectric ceramic from the powder by spark sintering, annealing treatment is carried out in an oxygen atmosphere, and the obtained piezoelectric ceramic has good electrical properties.
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Description

technical field

[0001] The invention relates to the technical field of functional ceramic materials, in particular to the preparation of a Ta-doped potassium sodium niobate-based piezoelectric ceramic material. Background technique

[0002] Piezoelectric ceramics are information functional ceramic materials that can convert mechanical energy and electrical energy to each other, and are widely used in medical imaging, acoustic sensors, acoustic transducers, ultrasonic motors and other fields.

[0003] At present, the industrialized piezoelectric ceramics are mainly lead-based PZT, PMNT and PZNT. The extensive use of these materials will bring great harm to human life and the natural environment. American scholars studied KNbO in 1959 3 -NaNbO 3 , when the composition is K 0.5 Na 0.5 NbO 3 (NKN for short), the performance of ceramic solid solution is the best. KbO 3 and K 0.5 Na 0.5 NbO 3 The phase stability temperatures of the phases are 1040 °C and 1140 °C, respect...

Claims

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