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Lead-free piezoelectric ceramic sintering aid, preparation technology thereof and method of using sintering aid to prepare piezoelectric ceramic

A technology of lead-free piezoelectric and piezoelectric ceramics, applied in chemical instruments and methods, inorganic chemistry, tantalum compounds, etc., can solve the problems of KNN sintering being volatile and difficult to form ceramics, etc., to improve the quality factor and electromechanical coupling coefficient, Effect of Reducing Dielectric Loss

Inactive Publication Date: 2010-10-20
WEIFANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A third object of the present invention is to provide 2 Ta 4 o 12 The method of preparing piezoelectric ceramics with a sintering aid to make the material dense into porcelain can solve the defects that the existing KNN sintering is easy to be volatile and difficult to form porcelain, so it can be extended to solve the sintering problem of KNN doped series materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Will (Na 0.5 K 0.5 )NbO 3 The powder is granulated by adding polyvinyl alcohol binder, and pressed into a circular green sheet with a diameter of 15 mm and a thickness of 1.5 mm under a pressure of 200 MPa, and then discharged at 650 ° C. The green sheet after plastic discharge is pre-fired at 1080°C, and the sintering time is 3 hours. In order to avoid component deviation caused by volatilization of potassium and sodium, the ceramic samples were buried in the powder of the same component during sintering.

Embodiment 2

[0031] Using analytically pure chemical reagents CuO (99.0%), Ta 2 o 5 (99.5%), accurately weighed according to the molar ratio of 1:1, through the synthesis reaction to generate Cu 2 Ta 4 o 12 . The specific process steps are: according to the above raw material ratio, CuO and Ta 2 o 5 Mix, put the above mixed material and alcohol in the ratio of 1:1 by volume and put it in the place where ZrO 2 In the nylon tank of the ball, use the planetary ball milling method to mix and ball mill for 12 hours to obtain a slurry; dry the ball-milled slurry in a drying oven at a drying temperature of 120 ° C for 16 hours to obtain a powdery Materials: Press the powder into a block and put it in an alumina crucible for 4 hours to pre-fire at a temperature of 850°C; crush and sieve the solid obtained after sintering to prepare Cu with uniform particle size 2 Ta 4 0 12 .

[0032] The (Na 0.5 K 0.5 )NbO 3 and Cu 2 Ta 4 o 12Prepared at a molar ratio of 1:0.0025. The prepared pow...

Embodiment 3

[0034] Using analytically pure chemical reagents CuO (99.0%), Ta 2 o 5 (99.5%), accurately weighed according to the molar ratio of 1:1, through the synthesis reaction to generate Cu 2 Ta 1 o 12 . The specific process steps are: according to the above raw material ratio, CuO and Ta 2 o 5 Mix, put the above-mentioned mixed material and alcohol in the ratio of 1.5:1 by volume and put it in the place where ZrO 2 In the nylon tank of the ball, use the planetary ball milling method to mix and ball mill for 10 hours to obtain a slurry; dry the ball milled slurry in a drying oven at a drying temperature of 80 ° C for 24 hours to obtain a powdery Materials: Press the powder into blocks and place it in an alumina crucible for 4.5 hours to pre-fire at a temperature of 800°C; crush and sieve the solids obtained after sintering to prepare Cu with uniform particle size 2 Ta 4 o 12 .

[0035] The (Na 0.5 K 0.5 )NbO 3 and Cu 2 Ta 4 o 12 Prepared at a molar ratio of 1:0.005. T...

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Abstract

The invention discloses a lead-free piezoelectric ceramic sintering aid, a preparation technology thereof and a method of using the sintering aid to prepare piezoelectric ceramic, belonging to technical field of ceramic preparation technology. After the pre-sintered and synthesized (Na0.5K0.5) NbO3 and Cu2Ta4O12 powder is ball-milled, adhesive is added for granulation, forming is conducted and high-temperature sintering is conducted to obtain final products. Since the Cu2Ta4O12 is used as the sintering aid of (Na0.5K0.5) NbO3 products, the structure of orthogonal perovskite used as raw material is not changed, the optimum compactness can reach 4.37g / cm<3>, the optimum quality factor Qm value can reach 1718, the dielectric loss is 0.36 percent and thereby high-quality lead-free piezoelectric ceramic can be obtained.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation technology, especially the Cu 2 Ta 4 o 12 As a new type of sintering aid material, through the ordinary ceramic preparation process, a low dielectric loss, high Q m Value xmol% Cu 2 Ta 4 o 12 +(Na 0.5 K 0.5 )NbO 3 Lead-free piezoelectric ceramic material system, Cu 2 Ta 4 o 12 The introduction can effectively increase (Na 0.5 K 0.5 )NbO 3 Density of ceramic materials and reduce their dielectric loss. Background technique [0002] (Na 0.5 K 0.5 )NbO 3 (KNN for short) based piezoelectric ceramic material is one of the important research directions in the field of lead-free piezoelectric material research. Currently relevant (Na 0.5 K 0.5 )NbO 3 A lot of research work has been carried out on lead-free piezoelectric materials based on KNN based ceramic materials. LiNbO 3 , LiSbO 3 , Li(Nb, Ta, Sb)O 3 Substitution of other materials and BaTiO 3 , SrTiO 3 , (Bi 0.5...

Claims

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Application Information

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IPC IPC(8): C04B35/63C04B35/495C04B35/622C01G35/00
Inventor 黄宝歆逯怀新王军华王震华苏文斌
Owner WEIFANG UNIVERSITY
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