Preparation method of potassium-sodium niobate leadless piezo-electric ferroelectric ceramic

A technology of lead-free piezoelectric and ferroelectric ceramics, applied in the field of functional ceramic environment-friendly materials, can solve the problems of poor piezoelectric performance and low density, and achieve excellent ferroelectric performance, high density, energy saving and production cost effect

Inactive Publication Date: 2011-04-27
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently producing and preparing Na 1-x K x NbO 3 The main method of the base material is the solid phase reaction method, using oxides or carbonates as raw materials, after a long time of ball milling, using high pressure (such as 300Mp) or isostatic pressing and other molding processes, and sintering at 1150 ° C or plasma discharge into porcelain , the obtained ceramics have high density and good piezoelectric performance; however, Na 1-x K x NbO 3 Ceramic samples have low density and poor piezoelectric properties, and the harsh preparation conditions will undoubtedly limit the Na 1-x K x NbO 3 Development and application of base ceramics

Method used

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  • Preparation method of potassium-sodium niobate leadless piezo-electric ferroelectric ceramic
  • Preparation method of potassium-sodium niobate leadless piezo-electric ferroelectric ceramic
  • Preparation method of potassium-sodium niobate leadless piezo-electric ferroelectric ceramic

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Experimental program
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Embodiment 1

[0025] First, weigh 0.08mol of citric acid into a 500mL beaker, add 100mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.02mol of sodium nitrate, 0.02mol of potassium nitrate, and 0.04mol of niobium oxalate into the In the above solution, disperse with magnetic stirring, and heat at 50°C to promote dissolution to form a transparent solution. Adjust the pH value to 4.5 with ammonia water, and age the mixed solution for 6 hours. In the second step, the solution was evaporated to dryness in a water bath at 90° C. to remove moisture, and dried in an oven at 160° C. until a black xerogel was formed. The third step is to grind the xerogel, heat-treat it in an air atmosphere at 600°C for 5 hours in a muffle furnace, remove organic matter to obtain a precursor powder, then grind the precursor powder, and press it with a tablet machine at 30Mp. Sintered at 1000°C for 1.2 hours in a Furnace to obtain Na 0.5 K 0.5 NbO 3 cer...

Embodiment 2

[0032] First, weigh 0.08mol of citric acid into a 500mL beaker, add 80mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.02mol of sodium nitrate, 0.02mol of potassium nitrate, and 0.04mol of niobium oxalate into the In the above solution, disperse with magnetic stirring, and heat at 50°C to promote dissolution to form a transparent solution. Adjust the pH value to 4 with ammonia water, and age the mixed solution for 6 hours. In the second step, the solution was evaporated to dryness in a water bath at 90° C. to remove moisture, and dried in an oven at 160° C. until a black xerogel was formed. The third step is to grind the xerogel, and heat-treat it in an air atmosphere at 600°C for 5 hours in a muffle furnace to remove organic matter to obtain a precursor powder, then grind the precursor powder, and press the tablet machine at 20Mp, Sintered at 900°C for 1 hour in a Furnace to obtain Na 0.5 K 0.5 NbO 3 ceramics. ...

Embodiment 3

[0039] First, weigh 0.08mol of citric acid into a 500mL beaker, add 120mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.02mol of sodium nitrate, 0.02mol of potassium nitrate, and 0.04mol of niobium oxalate into the In the above solution, disperse with magnetic stirring, and heat at 50°C to promote dissolution to form a transparent solution. Adjust the pH value to 4 with ammonia water, and age the mixed solution for 6 hours. In the second step, the solution was evaporated to dryness in a water bath at 90° C. to remove moisture, and dried in an oven at 160° C. until a black xerogel was formed. The third step is to grind the xerogel and heat-treat it in an air atmosphere at 600°C for 5 hours in a muffle furnace to remove organic matter to obtain a precursor powder. Sintered at 800°C for 2 hours in a Furnace to obtain Na 0.5 K 0.5 N b o 3 ceramics. In the fourth step, in order to measure the electrical properties,...

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Abstract

The invention discloses a method for preparing a potassium-sodium niobate leadless piezo-electric ferroelectric ceramic by a low-temperature normal-pressure complete liquid-state process, belonging to the field of a functional ceramic environment-friendly material. The method comprises the following steps: mixing raw materials in accordance with Na(1-x)KxNbO3, synthesizing precursor powder by using citric acid as a complexing agent and using a soluble salt as a raw material, tabletting at the pressure intensity of 20-40 MPa, and sintering at a temperature of 800-1000 DEG C to obtain a high-density pure-phase ceramic, wherein the ferroelectricity, the piezoelectricity and the dielectric property of the ceramic are excellent, and the process relates to processing steps of raw material mixing, molding, sintering, silver baking, polarizing and the like. The complete liquid-phase process effectively reduces the sintering temperature of the potassium-sodium niobate leadless piezo-electric ferroelectric ceramic, and the high-density ceramic can be molded by pressure under the pressure intensity of a conventional grinding tool; and ceramic particles grow uniformly and well, and the electric performance of the ceramic is excellent. Besides, the preparation process has the characteristics of simplicity, convenience, energy conservation, no poison, no environmental pollution and the like, thereby having wide application prospects.

Description

technical field [0001] The invention relates to the field of functional ceramic environment-friendly materials. Background technique [0002] Environmental protection has always been a major issue in the process of human development. With the development of electronic technology and functional materials, environmentally friendly and resource-saving materials have attracted more and more attention. Lead-free piezoelectric ferroelectric capacitors are The advantages of potential wide application prospects and no pollution to the environment and health have been valued and developed. At present, lead-free piezoelectric ferroelectric materials mainly include BaTiO 3 base, BiNaTiO 3 base, niobate and bismuth layered perovskite lead-free materials, among which niobate such as NaNbO 3 , KNbO 3 , LiNbO 3 And its solid solution has attracted attention because of its high electric polarization strength, high Curie temperature, and excellent piezoelectric ferroelectric and dielect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 袁松柳霍绍新田召明
Owner HUAZHONG UNIV OF SCI & TECH
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