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Preparation method of potassium sodium niobate based piezoelectric ceramics

A potassium-sodium niobate-based, piezoelectric ceramic technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of poor preparation process, easy volatilization, narrow sintering temperature, etc. To achieve the effect of improving electrical performance

Inactive Publication Date: 2017-12-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of KNN is poor, the sintering temperature is narrow, and the alkali metal element K + 、Na + It is extremely volatile at high temperature, and it is difficult to obtain lead-free piezoelectric ceramics with good density and excellent comprehensive performance by traditional preparation technology

Method used

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  • Preparation method of potassium sodium niobate based piezoelectric ceramics
  • Preparation method of potassium sodium niobate based piezoelectric ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of potassium sodium niobate-based piezoelectric ceramics (such as figure 1 shown), specifically include the following steps:

[0021] (1) Weigh 0.48mol of K respectively 2 CO 3 , 0.52mol of Na 2 CO 3 , 0.96mol of Nb 2 o 5 , 0.04mol of Sb 2 o 3 , put the accurately weighed raw materials in a nylon tank, add zirconia balls, use absolute ethanol as the ball milling medium, and ball mill for 20 hours according to the mass ratio of materials: balls: ethanol = 1:2:2.

[0022] (2) Put the ball-milled slurry into a drying oven at 60°C for drying, and press it into Φ A 30 mm disc was pre-fired at 700 °C for 2.5 h to synthesize KNNS powder ((K 0.48 Na 0.52 )Nb 0.96 Sb 0.04 o 3 ); the pre-burned powder is subjected to secondary ball milling and dried.

[0023] (3) Weigh 7 wt% PVA aqueous solution according to the mass of KNNS powder for grinding, and use a tablet press to make the granulated powder under a pressure of 150 MPa Φ 12.7 mm x 1.3 m...

Embodiment 2

[0026] A preparation method of potassium sodium niobate-based piezoelectric ceramics (such as figure 1 shown), specifically include the following steps:

[0027] (1) Weigh 0.5mol of K respectively 2 CO 3 , 0.5mol of Na 2 CO 3 , 0.98mol of Nb 2 o 5 , 0.02mol of Sb 2 o 3 , put the accurately weighed raw materials in a nylon tank, add zirconia balls, use absolute ethanol as the ball milling medium, and ball mill for 10 hours according to the mass ratio of material: balls: ethanol = 1:2:2.

[0028] (2) Put the ball-milled slurry into a drying oven at 50°C for drying, and press it into Φ A 30 mm disc was pre-fired at 800 °C for 1.5 h to synthesize KNNS powder ((K 0.5 Na 0.5 )Nb 0.98 Sb 0.02 o 3 ).

[0029] (3) Perform secondary ball milling on the pre-calcined powder, dry it, then add polyvinyl alcohol aqueous solution (the mass is 7wt% of the KNNS powder mass) for grinding, and use a tablet machine to granulate the powder at a pressure of 250MPa Made under Φ 12.7...

Embodiment 3

[0032] A preparation method of potassium sodium niobate-based piezoelectric ceramics (such as figure 1 shown), specifically include the following steps:

[0033] (1) Weigh 0.5mol of K respectively 2 CO 3 , 0.5mol of Na 2 CO 3 , 0.97mol of Nb 2 o 5 , 0.03mol of Sb 2 o 3 , put the accurately weighed raw materials in a nylon tank, add zirconia balls, use absolute ethanol as the ball milling medium, and ball mill for 30 hours according to the mass ratio of materials: balls: ethanol = 1:2:2.

[0034] (2) Put the ball-milled slurry into a drying oven at 70°C for drying, and press it into Φ A 30 mm disc was pre-fired at 900 °C for 2 h to synthesize KNNS powder ((K0.5 Na 0.5 )Nb 0.97 Sb 0.03 o 3 ). The pre-fired powder is subjected to secondary ball milling and dried.

[0035] (3) Perform secondary ball milling on the pre-calcined powder, dry it, then add polyvinyl alcohol aqueous solution (the mass is 7 wt% of the KNNS powder mass) for grinding, and use a tablet machin...

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Abstract

The invention relates to a preparation method of potassium sodium niobate based piezoelectric ceramics, and belongs to the field of novel lead-free based functional ceramics. The method is characterized in that the solid solubility between potassium niobate and sodium niobate in the potassium sodium niobate based piezoelectric ceramics is increased to improve the electric properties of the potassium sodium niobate based piezoelectric ceramics; and the potassium sodium niobate based piezoelectric ceramics comprise the following raw materials in mol percentage: 48-52% of K2CO3, 48-52% of Na2CO3, 96-100% of Nb2O5 and 0-4% of Sb2O3. The method provided by the invention can effectively regulate and control the phase structure and the microscopic morphology of the potassium sodium niobate based piezoelectric ceramics, thereby improving the electric properties of the potassium sodium niobate based piezoelectric ceramics.

Description

technical field [0001] The invention relates to a preparation method of potassium sodium niobate-based piezoelectric ceramics, belonging to the field of novel lead-free based functional ceramics. Background technique [0002] Piezoelectric ceramics are a class of important functional materials that can realize mutual conversion of mechanical energy and electrical energy, and have been widely used in the fields of sensors, drives, transducers, non-destructive testing and communication technology. Lead-based piezoelectric ceramics, mainly lead zirconate titanate (PZT), occupy a dominant position in the world piezoelectric material market, but the content of lead oxide as high as 60% brings serious harm to human beings and the ecological environment. Therefore, the development and exploration of lead-free piezoelectric ceramic materials with excellent performance has become a research hotspot of scholars from all over the world. Potassium sodium niobate (KNN) piezoelectric cer...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/626C04B35/634C04B35/638H01L41/187
CPCC04B35/495C04B35/62645C04B35/63416C04B35/638C04B2235/6562C04B2235/6567C04B2235/3201C04B2235/3294C04B2235/94C04B2235/95C04B2235/96H10N30/8542
Inventor 严继康姜贵民郭根生徐腾威杜景红甘国友易健宏
Owner KUNMING UNIV OF SCI & TECH
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