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Method for synthesizing titanate series electronic ceramic nano-crystalline materials

A technology of electronic ceramics and synthesis methods, which is applied in the direction of ceramics and inorganic insulators, can solve the problems of high-end titanate products such as high prices and unbalanced market supply, and achieve the effects of low cost, small number of crystals, and reduced production speed

Active Publication Date: 2012-10-10
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

However, there is no report on the preparation of titanate nanomaterials by composite alkali fusion method. Titanate nanomaterials occupy an important position in the electronic information industry. According to the characteristics of titanate preparation raw materials and reaction process, high efficiency and low cost are adopted. Synthesized by the compound alkali fusion method, and added raw material selection and high-energy ball milling activation process, can obtain high-purity, high-dispersion, high-order crystal phase batch products, which is expected to solve the current high-end titanate products that are expensive and market supply imbalance problem

Method used

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  • Method for synthesizing titanate series electronic ceramic nano-crystalline materials
  • Method for synthesizing titanate series electronic ceramic nano-crystalline materials
  • Method for synthesizing titanate series electronic ceramic nano-crystalline materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Ingredients ball mill: Accurately weigh 1001.695g BaCO respectively 3 and 498.305g TiO 2 .H 2 O, high-energy ball mill activation for 60 minutes, the ball-to-material ratio was 20:1, and the mill speed was 1500 r / min. Then weigh a total of 2750g NaOH and 2250g KOH, add the above-mentioned ball mill equipped with reactants to continue ball milling for 30min, the mill speed is 800r / min, and finally all are transferred into a Teflon reaction vessel with a volume of 2L.

[0036]2. Heating reaction: seal the above Teflon reaction vessel, heat in a sand bath at 180°C for a total heating time of 240min, and then cool naturally to room temperature.

[0037] 3. Washing and drying: After washing the reaction product collected in step 2 twice with 90°C deionized water, transfer it to a ball mill, add deionized water to make a 2:1 slurry, ball mill for 30 minutes again, centrifuge, vacuum Dry to obtain barium titanate ceramic powder.

[0038] Table 1 compares the performance...

Embodiment 2

[0043] 1. Ingredients ball mill: accurately weigh 590.520g SrCO 3 and 391.600g TiO 2 .H 2 O, high-energy ball mill activation for 60 minutes, the ball-to-material ratio was 20:1, and the mill speed was 1600 r / min. Then weigh a total amount of 2156g NaOH and 1764g KOH, add the above-mentioned ball mill equipped with reactants to continue ball milling for 30min, the mill speed is 800r / min, and finally all are transferred into a Teflon reaction vessel with a volume of 2L.

[0044] 2. Heating reaction: Seal the above-mentioned Teflon reaction vessel, heat it with a muffle furnace, raise it to 170°C, keep it warm for 2 hours, and then cool it down to room temperature naturally.

[0045] 3. Washing and drying: use 90°C deionized water to prepare the reaction product collected in step 2 into a slurry, dissolve and age for 30 minutes, and then centrifuge. After separation, the above washing steps were repeated twice. Vacuum drying to obtain strontium titanate ceramic powder A.

...

Embodiment 3

[0048] 1. Ingredients ball mill: accurately weigh 590.520g SrCO 3 and 319.200g commercial TiO 2 , activated by high-energy ball milling for 60 minutes, the ball-to-material ratio was 20:1, and the mill speed was 1600r / min. Then take the total amount of 2156g NaOH and 1764g KOH, add the above-mentioned ball mill equipped with reactants to continue ball milling for 30min, the mill speed is 800r / min, and finally all are transferred into a Teflon reaction vessel with a volume of 2L.

[0049] 2. Heating reaction: Seal the above-mentioned Teflon reaction vessel, heat it with a muffle furnace, raise it to 170°C, keep it warm for 2 hours, and then cool it down to room temperature naturally.

[0050] 3. Washing and drying: use 90°C deionized water to prepare the reaction product collected in step 2 into a slurry, dissolve and age for 30 minutes, and then centrifuge. After separation, the above washing steps were repeated twice. Vacuum drying to obtain strontium titanate ceramic powd...

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Abstract

The invention discloses a method for synthesizing titanate series electronic ceramic nano-crystalline materials, which is suitable for preparing the nano-crystalline materials of barium titanate, strontium titanate, calcium titanate series or the like. In the method, composite molten caustic soda of sodium hydroxide and potassium hydroxide is used as a reaction fluxing agent, and the reactants are cheap and readily available soluble inorganic metal salt and metatitanic acid substance; The method comprises the following steps of: performing high-energy ball milling and activation pretreatment on the reactants without harsh reaction conditions of high temperature, high pressure and the like or complex process control steps such as pH value adjustment, roasting control and the like; and performing chemical reaction under normal pressure and at the temperature of 180+ / -10 DEG C to synthesize the material. The method has the advantages of few controllable parameters in the synthesis process, simple process, low synthesis cost and suitability for scale production. The obtained titanate product has well-defined crystals and uniform size, is nano-scale and is suitable for researching the intrinsic performance and bringing the function of the nano-crystalline material into play to the greatest extent. The method promotes the domestic independent research and development level of the electronic ceramic material and provides a basis for the domestication of high-purity super-fine titanate high-end products.

Description

technical field [0001] The invention relates to the technical field of nano crystal synthesis of titanate electronic ceramics, in particular to a composite alkali fusion synthesis method of nano crystal materials. Background technique [0002] Titanate series electronic ceramic nanocrystal material is a kind of dielectric material with excellent electrical properties, which can be used to manufacture electronic components such as multilayer ceramic capacitor MLCC, thermistor PTC, photoresistor, etc., which are widely used in automobiles, communications, computers, etc. , mobile phones and other electronic products. With the rapid development of the electronic information industry, the market demand for high-purity, ultra-fine titanate crystal materials with high order crystal phase is increasing. The main methods currently used to prepare titanate materials are: high-temperature solid-phase method, liquid-phase precipitation method, sol-gel method and hydrothermal method, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/462C04B35/468C04B35/47C04B35/622
Inventor 彭铁缆汤育才匡建波
Owner HUNAN SEEDER ELECTRONICS CERAMIC TECH IND PARK DEV CO LTD
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