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Method for preparing ultra-fine barium titanate powder by low-temperature combustion

A low-temperature combustion and ultra-fine powder technology, which is applied in the direction of titanate, alkaline earth metal titanate, chemical instruments and methods, etc., can solve a large number of acid-base, barium titanate powder particles with irregular shapes and long synthesis time and other problems, to achieve the effects of reducing time and energy consumption, good industrialization prospects, and short preparation time

Inactive Publication Date: 2018-02-16
HUNAN SEEDER ELECTRONICS CERAMIC TECH IND PARK DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The barium titanate powder obtained by the traditional solid-state reaction method has defects such as irregular particle shape, wide particle size distribution, uneven composition, and high impurity content, and needs to be reacted at high temperature, resulting in high energy consumption and high cost.
The sol-gel method has a long process flow, needs to prepare the precursor first, and consumes relatively expensive chemical raw materials, and the product has more impurities
The liquid phase reaction method and the hydrothermal method increase the process flow, the synthesis time is long, a large amount of acid and alkali is required, and the cost is high

Method used

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  • Method for preparing ultra-fine barium titanate powder by low-temperature combustion
  • Method for preparing ultra-fine barium titanate powder by low-temperature combustion
  • Method for preparing ultra-fine barium titanate powder by low-temperature combustion

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Effect test

Embodiment 1

[0024] Mix barium nitrate and titanium dioxide raw materials uniformly in a mixer according to a certain ratio, the molar ratio of barium nitrate and titanium dioxide is 1:1, add a certain amount of combustion agent C 6 h 8 o 7 , the molar ratio of the combustion agent to barium nitrate is 3:1, add absolute ethanol with a volume ratio of 5:1 to the mixed powder, and stir slowly at room temperature for 30 minutes, so that the combustion agent and the mixed powder are evenly mixed to obtain a viscous Put the viscous mixture into a container, and rapidly heat up to 300°C at a heating rate of not less than 10°C per minute. After the reaction, grind and sieve the powder to obtain ultrafine barium titanate powder.

Embodiment 2

[0026] Mix barium nitrate and titanium dioxide raw materials uniformly in a mixer according to a certain ratio, the molar ratio of barium nitrate and titanium dioxide is 1:1, add a certain amount of combustion agent CH 3 COONH 4 , the molar ratio of the combustion agent to barium nitrate is 2:1, add absolute ethanol with a volume ratio of 7:1 to the mixed powder, and stir slowly at room temperature for 25 minutes, so that the combustion agent and the mixed powder are evenly mixed to obtain a viscous Put the viscous mixture into a container, and rapidly heat up to 250°C at a heating rate of not less than 10°C per minute. After the reaction, grind and sieve the powder to obtain ultrafine barium titanate powder.

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Abstract

The invention discloses a method for preparing ultra-fine barium titanate powder by low-temperature combustion. The method includes the uniformly mixing barium nitrate and titanium dioxide raw materials in a mixer according same molar ratio to obtain mixed raw material powder; adding combustion agents according to stoichiometric ratio, adding a certain proportion of liquid-phase media, slowly stirring mixture for a certain time at the indoor temperature, and uniformly mixing the combustion agents and the mixed raw material powder to obtain viscous mixture; placing the viscous mixture into a container, and rapidly heating the mixture to reach the ignition temperature of reaction substrates at the heating speed not lower than 10 DEG C / minutes; performing low-temperature combustion reaction on the raw materials, grinding and screening the reacted powder to obtain the ultra-fine barium titanate powder. By a low-temperature combustion synthesis method, the barium titanate powder is preparedby the aid of high energy generated by the combustion agents at the ignition temperature, the method is low in preparation temperature, rapid in reaction, short in preparation time and simple in device, time for preparing the barium titanate powder is greatly shortened, energy consumption is greatly reduced, efficiency is improved, cost is saved, the ultra-fine barium titanate powder can be acquired, and the method a has good industrial prospect.

Description

technical field [0001] The invention relates to the technical field of preparation of electronic ceramic powder materials, in particular to a method for preparing ultrafine barium titanate powder by low-temperature combustion. Background technique [0002] With the development of society, more and more electronic ceramics are used in industry, and the electronic ceramics industry has formed an independent and complete industrial production system in our country. Among them, barium titanate ceramic material is one of the most widely used electronic ceramic raw materials at home and abroad. Because of its high dielectric constant, good ferroelectricity, piezoelectricity, withstand voltage and insulation properties, it is mainly used to make capacitors, Multilayer substrates, various sensors, semiconductor materials and sensitive components. With the discovery of the performance of barium titanate ceramics and the development and utilization of electronic ceramic devices, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82Y40/00
CPCC01G23/006B82Y40/00C01P2002/72C01P2004/03C01P2004/64
Inventor 彭铁缆周洁张学华陈功哲
Owner HUNAN SEEDER ELECTRONICS CERAMIC TECH IND PARK DEV CO LTD