Method for promoting cold sintering of potassium-sodium niobate-based leadless piezoelectric ceramics

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in the field of functional ceramic materials, can solve problems such as uneven distribution of water-based liquid phases, achieve the effects of shortening the preparation cycle, simplifying the process flow, and uniform distribution

Active Publication Date: 2021-08-31
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for promoting the cold sintering of potassium sodium niobate-based lead-free piezoelectric ceramics by heat-treating powder in a reducing atmosphere, improving the surface wettability of the powder, and solving the problem of water-based liquid phase in the cold sintering process. The problem of uneven distribution on the surface of KNN particles makes the potassium-rich phase more completely wrapped on the surface of KNN particles, effectively inhibits the volatilization of K and Na elements, reduces the deviation of the stoichiometric ratio of KNN ceramics, and improves the performance of potassium-sodium niobate-based ceramics

Method used

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  • Method for promoting cold sintering of potassium-sodium niobate-based leadless piezoelectric ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Ingredients: K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 Mix according to molar ratio 1:1:2 to obtain compound;

[0037] (2) Ball milling: put the mixture into the ball milling tank, then add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the mixed slurry to a crystallization dish and place it in an oven at 80°C Dry in the oven, and then put the mixture into the mortar for grinding;

[0038] (3) Pre-burning: Add the above-mentioned ground mixture into the crucible, compact and cover it, put it in the muffle furnace, heat it up to 850°C for 4 hours, and take it out after it is naturally cooled to room temperature;

[0039](4) Secondary ball milling: Add the above-mentioned pre-calcined mixture into the ball milling tank, and add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the slurry to the crystallization dish and place Dry in an ...

Embodiment 2

[0046] (1) Ingredients: K 2 CO 3 、Na 2 CO 3 and Nb 2 O 5 Mix according to molar ratio 1:1:2 to obtain compound;

[0047] (2) Ball milling: put the mixture into the ball milling tank, then add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the mixed slurry to a crystallization dish and place it in an oven at 80°C Dry in the oven, and then put the mixture into the mortar for grinding;

[0048] (3) Pre-burning: Add the above-mentioned ground mixture into the crucible, compact and cover it, put it in the muffle furnace, heat it up to 850°C for 4 hours, and take it out after it is naturally cooled to room temperature;

[0049] (4) Secondary ball milling: Add the above-mentioned pre-calcined mixture into the ball milling tank, and add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the slurry to the crystallization dish and place Dry in an...

Embodiment 3

[0059] (1) Ingredients: K 2 CO 3 、Na 2 CO 3 and Nb 2 O 5 According to the molar ratio of 1:1:2 mixed to obtain a mixture

[0060] (2) Ball milling: put the mixture into the ball milling tank, then add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the mixed slurry to a crystallization dish and place it in an oven at 80°C Dry in the oven, and then put the mixture into the mortar for grinding;

[0061] (3) Pre-burning: Add the above-mentioned ground mixture into the crucible, compact and cover it, put it in the muffle furnace, heat it up to 850°C for 4 hours, and take it out after it is naturally cooled to room temperature;

[0062] (4) Secondary ball milling: Add the above-mentioned pre-calcined mixture into the ball milling tank, and add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the slurry to the crystallization dish and place ...

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Abstract

The invention discloses a method for promoting cold sintering of potassium-sodium niobate-based leadless piezoelectric ceramics through heat treatment of powder in a reducing atmosphere. The method comprises the following steps: firstly preparing potassium-sodium niobate powder, then carrying out heat treatment in a reducing atmosphere to improve the wettability of the powder and promote cold sintering, then adding deionized water into the potassium-sodium niobate powder, performing grinding, carrying out molding at a set temperature and uniaxial pressure, and then carrying out drying and sintering to obtain the KNN ceramic with excellent performance. The method is simple in process step and easy to operate, the wettability of the powder surface is improved, the problem that a liquid phase is not uniformly distributed on the surfaces of KNN particles in a conventional cold sintering process is solved, the surfaces of the KNN particles are wrapped with a potassium-rich phase more completely, volatilization of K and Na elements is effectively inhibited, deviation of a stoichiometric ratio of the KNN ceramic is reduced, and the performance of the potassium-sodium niobate-based ceramics is improved.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and in particular relates to a method for promoting cold sintering of potassium sodium niobate-based lead-free piezoelectric ceramics by heat-treating powder in a reducing atmosphere. Background technique [0002] Piezoelectric ceramics can convert mechanical energy and electrical energy into each other. At the same time, due to their excellent characteristics such as stable chemical properties and easy processing into arbitrary shapes, they are widely used in electronic components such as sensors, filters, oscillators, and buzzers. It has become an indispensable part in daily life and industrial production. In addition, it is also closely watched by the fields of military and aerospace. [0003] At present, lead-based piezoelectric materials, mainly lead zirconate titanate, have been dominating the field of piezoelectric ceramics due to their excellent properties. However, the lead ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B2235/3201C04B2235/6582C04B2235/658C04B2235/656C04B2235/6567C04B2235/96
Inventor 林枞邓宝玉吴啸高旻赵纯林
Owner FUZHOU UNIV
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