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Preparation method of potassium sodium niobate-based ceramic

A potassium and sodium niobate-based ceramic technology is applied in the field of preparation of potassium and sodium niobate-based ceramics. Sintering performance, the effect of simplifying the process flow

Inactive Publication Date: 2018-09-28
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, potassium sodium niobate (KNN)-based lead-free piezoelectric ceramics has attracted much attention due to its relatively superior piezoelectric properties and high Curie temperature, but the preparation process of KNN-based ceramics is poor, and it is very sensitive to sintering temperature. It is often accompanied by the volatilization of potassium and sodium ions, which makes it difficult to prepare KNN-based ceramics with good performance by traditional ceramic technology.

Method used

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  • Preparation method of potassium sodium niobate-based ceramic

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preparation example Construction

[0029] A preparation method of potassium sodium niobate-based ceramics, comprising the following steps:

[0030] (1) Ingredients: according to chemical composition K x Na 1-x NbO 3 The stoichiometric ratio weighs the raw material K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 , mix well to obtain a mixture, where x=0.0-1.0;

[0031] (2) Primary ball milling: Add ball milling medium to the above mixture and place it in a nylon ball mill tank. The ball milling medium is alcohol and zirconia balls, and the mass ratio of zirconia balls, alcohol, and mixture is 2:0.5 : 1, then ball milling at a speed of 350-450r / min for 2 to 12 hours, then placing the mixture in an oven to dry at a temperature of 80 to 85°C, and then placing it in a mortar for grinding;

[0032] (3) Pre-burning: Put the ground mixture in a crucible, compact and cover it, put it in a muffle furnace, raise the temperature to 700-1000°C for constant temperature pre-burning for 1-6 hours, and naturally cool to room temperat...

Embodiment 1

[0038] A preparation method of potassium sodium niobate-based ceramics, comprising the following steps:

[0039] (1) Ingredients: according to chemical composition K x Na 1-x NbO 3 (x=0.0) stoichiometric ratio to weigh raw material K 2 CO 3 、Na 2 CO 3 、 Nb 2 o 5 mixing to obtain a mixture;

[0040] (2) One-time ball milling: add ball milling medium to the mixture, then put the mixture into a ball mill tank for ball milling for 2 hours, after the ball milling, put the mixture in an oven for drying at 80°C, and then The mixture is put into different mortars for grinding, wherein the ball milling medium is composed of alcohol and zirconia balls, and the mass ratio of the ball milling medium is 2:0. The mass ratio of 5:1 is added to the mixture to be ball milled;

[0041] (3) Pre-burning: Add the above-mentioned ground mixture into the crucible, compact and cover it, put it in a muffle furnace, raise the temperature to 700°C for constant temperature pre-burning for 2 ho...

Embodiment 2

[0047] A preparation method of potassium sodium niobate-based ceramics, comprising the following steps:

[0048] (1) Ingredients: according to chemical composition K x Na 1-x NbO 3 (x=0.5) stoichiometric ratio to weigh raw material K 2 CO 3 、Na 2 CO 3 、 Nb 2 o 5 mixing to obtain a mixture;

[0049] (2) One-time ball milling: add ball milling medium to the mixture, put the mixture into a ball mill tank and mill for 12 hours. After the ball milling, put the mixture in an oven to dry at 80°C, and The mixture is put into different mortars for grinding, wherein the ball milling medium is composed of alcohol and zirconia balls, and the mass ratio of the ball milling medium is 2:0. The mass ratio of 5:1 is added to the mixture to be ball milled;

[0050] (3) Pre-burning: Add the above-mentioned ground mixture into the crucible, compact and cover it, put it in a muffle furnace, raise the temperature to 850°C for constant temperature pre-burning for 4 hours, and then cool it...

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Abstract

The invention discloses a preparation method of potassium sodium niobate-based ceramic. The method comprises the steps of: firstly preparing potassium sodium niobate nano powder, then adding a certainamount of a grinding liquid to the potassium sodium niobate nano powder, performing molding under a set temperature and pressure, and then conducting heat treatment at 500-1000 DEG C so as to obtainthe KNN ceramic with a molding density of more than 90%. The preparation method has simple process steps and easy operation, and the sintering temperature of the KNN ceramic can be reduced, so that the problem of volatilization of potassium and sodium ions in the KNN ceramic at a high temperature is solved, time and energy are saved, and the flexibility of the production process is improved.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and in particular relates to a preparation method of potassium sodium niobate-based ceramics. Background technique [0002] Piezoelectric ceramics is a functional ceramic material that can convert electrical energy and mechanical energy into each other, and it is a kind of inorganic non-metallic material. Piezoelectric ceramics are widely used in oscillators, filters, sensors, etc. , not only widely used in daily life and production industry, but also a class of materials closely watched in the military field. [0003] Since the discovery of the piezoelectric effect, PZT piezoelectric ceramics have been widely concerned due to their excellent performance, and have been rapidly developed, and have always occupied a dominant position in the field of piezoelectric ceramics. However, the content of lead oxide (or trilead tetroxide) in this type of ceramic material is as high as 70%, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626
CPCC04B35/495C04B35/622C04B35/6261C04B35/62645C04B2235/74C04B2235/656C04B2235/3201
Inventor 林枞巫芳婷马建章詹红兵余兴
Owner FUZHOU UNIV
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