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Process for preparing submicron grade barium strontium phthalate powder by packing method

A barium strontium titanate, submicron technology, applied in the field of ceramic powder preparation, can solve problems such as difficulty in obtaining stoichiometric ratio, difficulty in removing impurity ions, and limiting practical application, and achieves fine particle size, low dielectric loss, The effect of easy control of the process

Inactive Publication Date: 2006-06-28
JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current various liquid-phase methods have greatly limited their practical application due to some insurmountable shortcomings.
For example, the agglomeration of powder prepared by co-precipitation method is relatively serious (Y.B.Khollam, S.B.Deshpande, H.S.Potdar, Mater Charact 2005; 54:63-74), and it is difficult to remove impurity ions; it is difficult to obtain stoichiometric BST powder by hydrothermal method (Ryan K.Roeder, Elliott B.Slamovich,. J.Am.Ceram.Soc., 82 [7] 1665-75 (1999)); and general sol-gel method, the raw material that adopts is all more expensive, and cost higher

Method used

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  • Process for preparing submicron grade barium strontium phthalate powder by packing method
  • Process for preparing submicron grade barium strontium phthalate powder by packing method
  • Process for preparing submicron grade barium strontium phthalate powder by packing method

Examples

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Embodiment 1

[0020] Example 1: Preparation of ultrafine BST powder under the condition of pH=7

[0021] according to figure 1 As shown in the process, first configure a certain concentration (1mol / l) of strontium nitrate solution, then mix barium carbonate, titanium dioxide and strontium nitrate solution according to the stoichiometric ratio (Ba:Sr:Ti=0.70:0.30:1.00), and add 0.5%-1% polyacrylic acid with a concentration of 50% relative to the total weight of the barium carbonate and titanium dioxide solids is used as a dispersant and a surfactant, and wet ball milled for 24 hours. Take out the mixed slurry, add the pre-prepared, excess ammonium bicarbonate solution (concentration: 1mol / l) under stirring, adjust the pH value to about 7 with ammonia water, so that the strontium ions are evenly wrapped in the form of strontium carbonate precipitation A stable slurry is formed on the surface of barium carbonate and titanium dioxide particles. The precipitate is filtered, washed, dried and c...

Embodiment 2

[0022] Example 2: Preparation of ultrafine BST powder under the condition of pH=10

[0023] according to figure 1As shown in the flow chart, a strontium nitrate solution with a certain concentration (2mol / l) is first configured, then barium carbonate, titanium dioxide and strontium nitrate solution are mixed according to the stoichiometric ratio (Ba:Sr:Ti=0.90:0.10:1.00), and Add 0.5%-1% polyacrylic acid with a concentration of 50% relative to the total weight of barium carbonate and titanium dioxide solids as a dispersant and surfactant, and wet ball mill for 24 hours. Take out the mixed slurry, add the pre-prepared and excess ammonium bicarbonate solution (concentration is 1mol / l) under stirring, and adjust the pH value to about 10 with ammonia water, so that the strontium ions are evenly distributed in the form of strontium carbonate precipitation Wrapped on the surface of barium carbonate and titanium dioxide particles to form a stable slurry. The precipitate is filtered...

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Abstract

A process for preparing submicron-class barium strontium titanate (BST) powder by wrapping method includes such steps as mixing barium carbonate powder, TiO2 powder and strontium nitrate solution, adding polyacrylic acid, wet ball grinding, adding excessive ammonium bicarbonate solution while stirring, using ammonia water to regulate pH=7-10 for depositing the strontium carbonate on the surface of barium carbonate and TiO2 particles, filtering, washing, drying and calcining.

Description

technical field [0001] The invention relates to a preparation method of barium strontium titanate (BST) submicron powder, belonging to the category of ceramic powder preparation. This method is different from the traditional solid-phase and liquid-phase preparation methods of BST powder, but uses polyacrylic acid as a dispersant and surfactant, and makes strontium carbonate evenly coated on the surface of solid particles by the encapsulation method to prepare submicron BST powder body. technical background [0002] Ferroelectric BST ceramic materials are widely used in various electronic ceramic devices due to their excellent properties such as high dielectric constant and adjustable Curie temperature. Such as various piezoelectric sensors (Li, X.; Qiu, F.; Guo, K.; Zou, B.; Gu, J.; Wang, J.; Xu, B. Mater. Chem. Phys. 1997, 50 , 227.), Dynamic Random Access Memory (DRAM) (Tahan, D.; Safari, A.; Klein, L.C. in Proc. IEEE. Int. Symp. Appl. Ferroelectr. ed. Pandey, R.K.; Liu,...

Claims

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Application Information

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IPC IPC(8): C01G23/00C01F11/00C04B35/47C04B35/626
Inventor 董显林毛朝梁
Owner JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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