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Preparation method of BaTiO3 microcrystalline powder

A technology of microcrystalline powder and powder, which is applied in the field of preparation of BaTiO3 microcrystalline powder, can solve the problems of deterioration of material density, coarsening of microstructure, and reduction of mechanical strength, and achieves good repeatability, low price, and high application wide range of effects

Inactive Publication Date: 2021-10-08
WUHU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using such a large-sized powder as a template will lead to deterioration of material density, coarsening of microstructure and reduction of mechanical strength.
Although the method of hot pressing can increase the density of its ceramics, the cost of hot pressing and excessive PbO make BaTiO 3 Ceramic material for formwork loses commercial potential

Method used

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  • Preparation method of BaTiO3 microcrystalline powder
  • Preparation method of BaTiO3 microcrystalline powder
  • Preparation method of BaTiO3 microcrystalline powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Raw material: Analytical pure BaCO 3 、TiO 2 , molten salt additive NaCl

[0023] Specific steps are as follows:

[0024] (1) Synthesized tetragonal BaTiO 3 Powder: with BaCO 3 and TiO 2 As raw material, according to BaTiO 3 Stoichiometric weighing of chemical raw materials, ball milling and mixing for 12 hours, drying, and synthesis of equiaxed BaTiO by traditional solid-state method at 1350°C and heat treatment for 3 hours 3 powder; and perform secondary ball milling to refine BaTiO 3 Powder, product A is finally obtained.

[0025] Product A (tetragonal BaTiO 3 powder) X-ray diffraction pattern and PDF standard card (JCPDS 05-0626) comparison example figure 1 shown.

[0026] from figure 1 found that the synthesized BaTiO 3 All the diffraction peaks of the XRD spectrum of the powder are consistent with the tetragonal BaTiO of the standard PDF spectrum (JCPDS05-0626). 3 The diffraction peaks of the two are completely consistent, indicating that pure tetragon...

Embodiment 2

[0034] Raw material: Analytical pure BaCO 3 、TiO 2 , molten salt additive NaCl

[0035] Specific steps are as follows:

[0036] (1) Synthesized tetragonal BaTiO 3 Powder: BaCO 3 and TiO 2 As raw material, according to BaTiO 3 Stoichiometric weighing of chemical raw materials, ball milling and mixing for 12 hours, drying, and synthesis of equiaxed BaTiO by traditional solid-state method at 1350°C and heat treatment for 3 hours 3 powder; and perform secondary ball milling to refine BaTiO 3 Powder.

[0037] (2) Preparation of flake (001) Ba 6 Ti 17 o 40 Powder: In order to fully mix the reactants, the solid-phase synthesized BaTiO 3 Powder and TiO 2 Mixing and ball milling for 12h, in which BaTiO 3 and TiO 2 The molar ratio is 6:9; then add NaCl molten salt of the same quality as the oxide raw material to continue ball milling, and dry at 80°C after discharge; the dried powder is sealed in a crucible, first at 800°C for 1h Melt the NaCl molten salt to a molten stat...

Embodiment 3

[0040] Raw material: Analytical pure BaCO 3 、TiO 2 , molten salt additive NaCl

[0041] Specific steps are as follows:

[0042] (1) Synthesized tetragonal BaTiO 3 Powder: BaCO 3 and TiO 2 As raw material, according to BaTiO 3 Stoichiometric weighing of chemical raw materials, ball milling and mixing for 12 hours, drying, and synthesis of equiaxed BaTiO by traditional solid-state method at 1350°C and heat treatment for 3 hours 3 powder; and perform secondary ball milling to refine BaTiO 3 Powder.

[0043] (2) Preparation of flake (001) Ba 6 Ti 17 o 40 Powder: In order to fully mix the reactants, the solid-phase synthesized BaTiO 3 Powder and TiO 2 Mixing and ball milling for 12h, in which BaTiO 3 and TiO 2 The molar ratio is 6:9; then add NaCl molten salt of the same quality as the oxide raw material to continue ball milling, and dry at 80°C after discharge; the dried powder is sealed in a crucible, first at 800°C for 1h Melt the NaCl molten salt to a molten stat...

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Abstract

The invention discloses a preparation method of BaTiO3 microcrystalline powder, and particularly relates to a preparation method of BaTiO3 microcrystalline powder with (111) orientation. According to the preparation method, pure high-crystallinity tetragonal BaTiO3 powder is synthesized by using a traditional solid phase method; the BaTiO3 powder synthesized by the solid phase method is used as raw powder for synthesizing flaky Ba6Ti17O40 powder via a molten salt method; the synthesized flaky Ba6Ti17O40 powder preferentially grows along the (001) direction; the Ba6Ti17O40 is used as a precursor, and prepared flaky BaTiO3 powder has the highest aspect ratio (wherein a diameter is in a range of 10-20 [mu]m, and thickness is less than 1.5 [mu]m); and in addition, OPL-XRD analysis shows that BaTiO3 preferentially grows along a (111) plane. The invention provides a new way for preparing the (111)-BaTiO3 microcrystalline powder on a large scale.

Description

technical field [0001] The present invention relates to a kind of BaTiO 3 The preparation method of microcrystalline powder, specifically relates to a kind of BaTiO with (111) orientation 3 The preparation process of microcrystalline powder belongs to the technical field of functional ceramic materials. Background technique [0002] Non-equiaxed BaTiO with tetragonal perovskite structure 3 With high chemical stability and good piezoelectric properties, it has been used as one of the very important templates for the preparation of perovskite textured ceramics. However, due to the symmetrical crystal structure of the perovskite system, it usually develops into equiaxed grain morphology, so it is difficult to synthesize anisotropic morphology by traditional solid-state methods. Nano-sized spherical, cubic, dendritic BaTiO 3 The powders have been synthesized by hydrothermal method. Micron size (001) oriented BaTiO 3 Fibers are synthesized by ion exchange reactions in molte...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/626
CPCC04B35/4682C04B35/62605
Inventor 吕丹亚张忠量吴康叶舟靳维维岳巧玉马通
Owner WUHU INST OF TECH
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