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Method for hydrothermally synthesizing strontium and yttrium multi-doped barium titanate multilayer ceramic capacitor ceramic powder

A technology of capacitor ceramics and hydrothermal synthesis, which is applied in the direction of fixed capacitor dielectrics and components of fixed capacitors, can solve the problems of serious powder hard agglomeration and unsatisfactory powder performance, and achieve fine powder grains and avoid powder The effect of hard agglomeration and uniform doping

Active Publication Date: 2011-06-08
LIAONING SILICATE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is in order to overcome the high-temperature calcined BaCO commonly used in industry at present 3 and TiO 2 or other barium-titanium compound methods to prepare barium titanate powder, there is a higher temperature, more serious powder hard agglomeration, powder performance can not meet the needs of the development of modern electronics industry, etc., provides a hydrothermal synthesis of strontium, yttrium Method for multi-doped barium titanate multilayer ceramic capacitor ceramic powder

Method used

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  • Method for hydrothermally synthesizing strontium and yttrium multi-doped barium titanate multilayer ceramic capacitor ceramic powder
  • Method for hydrothermally synthesizing strontium and yttrium multi-doped barium titanate multilayer ceramic capacitor ceramic powder

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Embodiment 1

[0020] Implementation steps of the method for hydrothermally synthesizing strontium, yttrium multi-doped barium titanate multilayer ceramic capacitor ceramic powder:

[0021] 1) with TiO 2 、Ba(OH) 2 ·8H 2 O, Sr(OH) 2 ·6H 2 O, Y (NO 3 ) 3 ·6H 2 O is the raw material, according to Ba:Ti=1~5, Sr(OH) 2 and Y(NO 3 ) 3 The proportions relative to the molar ratio of Ba were 5% and 3% batching, respectively.

[0022] 2) Dissolving the reaction precursor at 80-100° C. to form a homogeneous solution. And adding a NaOH solution with a concentration of 3 mol / L to adjust the pH value of the precursor solution in the range of 10-14.

[0023] 3) Move the homogeneous solution of the precursor to a high-pressure reactor and keep it warm for 20-36 hours under the condition of hydroheating at 200-250°C.

[0024] 4) centrifuging the mixed solution after the reaction.

[0025] 5) Wash the separated solution once with methylpyrrolidone, then with absolute ethanol, and finally with deio...

Embodiment 2

[0028] Implementation steps of the method for hydrothermally synthesizing strontium, yttrium multi-doped barium titanate multilayer ceramic capacitor ceramic powder:

[0029] 1), with TiO 2 、Ba(OH) 2 ·8H 2 O, Sr(OH) 2 ·6H 2 O, Y (NO 3 ) 3 ·6H 2 O is the raw material, according to Ba:Ti=1~5, Sr(OH) 2 and Y(NO 3 ) 3 The proportions relative to the molar ratio of Ba were 3% and 2% batching, respectively.

[0030] Other steps are with embodiment 1.

Embodiment 3

[0032] Implementation steps of the method for hydrothermally synthesizing strontium, yttrium multi-doped barium titanate multilayer ceramic capacitor ceramic powder:

[0033] 1), with TiO 2 、Ba(OH) 2 ·8H 2 O, Sr(OH) 2 ·6H 2 O, Y (NO 3 ) 3 ·6H 2 O is the raw material, according to Ba:Ti=1~5, Sr(OH) 2 and Y(NO 3 ) 3 The proportions relative to the molar ratio of Ba were 7% and 5% of the ingredients.

[0034] Other steps are with embodiment 1.

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Abstract

The invention relates to a method for hydrothermally synthesizing strontium and yttrium multi-doped barium titanate multilayer ceramic capacitor ceramic powder, and belongs to the field of functional ceramic materials. In the method, TiO2, Ba(OH)2.8H2O, Sr(OH)2.6H2O and Y(NO3)3.6H2O are taken as raw materials, the ratio of Ba to Ti is 1-5, and Sr(OH)2 and Y(NO3)3 account for 5 molar percent and 3molar percent respectively based on Ba. The method comprises the following steps of: dissolving a reaction precursor at the temperature of between 80 and 100 DEG C to form homogeneous solution, and adjusting the pH value of a reaction system by using alkali solution; preserving heat in a high-pressure reaction kettle at the temperature of between 200 and 250 DEG C for 20 to 36 hours under the hydrothermal condition; and separating reacted mixed solution, washing and drying to obtain the hydrothermally synthesized Sr / Y co-doped BaTiO3 multilayer ceramic capacitor ceramic powder. The synthesis temperature is low, and the powder has fine and uniform crystal grains and high surface activity and is favorable for subsequent ceramic sintering.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and relates to a method for hydrothermally synthesizing ceramic powder of strontium and yttrium multi-doped barium titanate multilayer ceramic capacitors. Background technique [0002] Barium titanate (BaTiO 3 ) has excellent dielectric and ferroelectric properties, and is widely used in the manufacture of multilayer ceramic capacitors (MLCC), heating elements, electro-optic devices, etc. It is one of the most widely used materials in the field of electronic ceramics. In recent years, the development of microelectronic communication has led to the miniaturization of multilayer ceramic capacitors to adapt to them. To achieve the goal of high precision, miniaturization and high reliability of electronic ceramic components, it is necessary to prepare uniform size, uniform dispersion, no agglomeration, super Fine and pure high-quality powder. At present, high-temperature calcined BaCO i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622H01G4/12
Inventor 王光辉韩绍娟许壮志薛健张明张莹莹
Owner LIAONING SILICATE RES INST
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