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Wrapping method of ceramic powder

A ceramic powder and coating technology, which is applied in the field of inorganic powder preparation, can solve the problems of affecting the performance of bulk materials, long production process cycle, and large thickness difference, etc., to achieve short cycle, high output, and avoid settlement. Effect

Active Publication Date: 2014-03-26
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all have the problem of large differences in the composition and thickness of the coating layer of different particles, which seriously affects the performance of the bulk material after production, and at the same time, the production process cycle is long and the output is low.

Method used

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  • Wrapping method of ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A coating method of ceramic powder according to the present invention, it comprises the following steps:

[0020] (1) Coating precursor solution preparation: add coating precursor powder aluminum nitrate to deionized water, after it is completely dissolved, add water-soluble gel substance acrylamide to it, stir to dissolve completely, and obtain coating Precursor solution; wherein, the mass ratio is aluminum nitrate: acrylamide: deionized water=5:5:90;

[0021] (2) Coating slurry preparation: Add silicon carbide powder to the coating precursor solution prepared in step (1), the mass ratio of silicon carbide powder to coating precursor solution is 5:95, and mix by ball milling Uniformly obtain the slurry; then vacuum defoaming treatment is carried out on the slurry, the vacuum degree is ≤0.1Pa, and the treatment time is 20min, so as to obtain a coated slurry with good fluidity and uniform dispersion;

[0022] (3) Gel curing: add initiator ammonium persulfate to the coat...

Embodiment 2

[0026] A coating method of ceramic powder according to the present invention, it comprises the following steps:

[0027] (1) Coating precursor solution preparation: Add the coating precursor powder magnesium nitrate into deionized water, after it is completely dissolved, add the water-soluble gel substance agarose, stir to dissolve completely, and obtain the coating Precursor solution; wherein, the mass ratio is magnesium nitrate: agarose: deionized water=5:5:90;

[0028] (2) Coating slurry preparation: Add silicon nitride powder to the coating precursor solution prepared in step (1), the mass ratio of silicon nitride powder to coating precursor solution is 8:92, Mix uniformly by ball milling to obtain slurry; then vacuum defoaming treatment is carried out on the slurry, the vacuum degree is ≤0.1Pa, and the treatment time is 30min, to obtain a coated slurry with good fluidity and uniform dispersion;

[0029] (3) Gel curing: control the temperature of the coated slurry obtaine...

Embodiment 3

[0033] A coating method of ceramic powder according to the present invention, it comprises the following steps:

[0034] (1) Coating precursor solution preparation: Add the coating precursor powder yttrium nitrate to absolute ethanol, after it is completely dissolved, add polyvinyl butyral, an organic solvent gel substance, and stir to make it Dissolve completely to obtain a coating precursor solution; wherein, the mass ratio is yttrium nitrate: polyvinyl butyral: absolute ethanol = 5:5:90;

[0035] (2) Coating slurry preparation: Add silicon nitride powder to the coating precursor solution prepared in step (1), the mass ratio of silicon nitride powder to coating precursor solution is 8:92, Mix uniformly by ball milling to obtain slurry; then vacuum defoaming treatment is performed on the slurry, the vacuum degree is ≤0.1Pa, and the treatment time is 20min, to obtain a coated slurry with good fluidity and uniform dispersion;

[0036] (3) Gel curing: control the temperature of...

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Abstract

The invention provides a wrapping method of ceramic powder. The wrapping method comprises the steps of (1) adding wrapping predecessor powder into deionized water or an organic solvent, adding the water soluble gel material or organic solvent gel material, and agitating to obtain the wrapping predecessor solution; (2) adding the wrapped powder into the wrapping predecessor solution, and defoaming under vacuum, thus obtaining wrapping size; (3) controlling the temperature of the wrapping size, or adding an initiator for generating cross-linking reaction, and then curing to form a gel body; (4) drying the gel body at temperature from room temperature to 60 DEG C and humidity from 40 to 70%, thus obtaining a blank; and (5) roasting the dried blank for 1 to 2 hours at 400 to 600 DEG C, so as to obtain the wrapped powder. With the adoption of the wrapping method, the problems of conventional method that the granular wrapping layers are greatly different in component and thickness are effectively solved; and the wrapping predecessor can be uniformly and effectively wrapped on the surface of the powder. The wrapping method has simplicity in wrapping technology, high output and short period.

Description

technical field [0001] The invention relates to a preparation method of inorganic powder, in particular to a coating method of ceramic powder. Background technique [0002] Ceramic powder also plays an extremely important role in the compounding and development of new materials, and is widely used in military, aviation, aerospace, chemical, pharmaceutical and other fields. In recent years, ultrafine powders, especially nanoscale ultrafine powders, have attracted increasing attention due to their unique small size effect, surface and interface effect, and quantum size effect. At the same time, it has been found through experimental research that two or more types of powder particles can be coated with a surface to obtain a high-performance composite powder. In addition to the properties of a single powder, the composite powder also has a composite synergistic function, which can change the surface properties of a single particle and increase the contact area of ​​two or more...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/628
Inventor 张敬义范锦鹏刘晓明张大海张健孙格靓
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH