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Chemical preparation method of core-shell Si3N4 compound powder

A composite powder and core-shell technology, applied in chemical instruments and methods, inorganic chemistry, nitrogen compounds, etc., to achieve the effects of easy control, excellent physics, and low energy consumption

Inactive Publication Date: 2009-06-03
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are core-shell TiO 2 , SiC, graphite and other composite powders, there is no core-shell Si 3 N 4 Composite powder

Method used

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  • Chemical preparation method of core-shell Si3N4 compound powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 3 g Si 3 N 4 Add the powder into 200ml of water, ultrasonically disperse for 5 minutes, stir evenly, and use 180 minutes to Si 3 N 4 Add 300ml of the mixed solution (150ml of 0.09mol / L aluminum nitrate and 150ml of 0.15mol / L yttrium nitrate) dropwise into the slurry at a constant speed, and drop into the precipitant ammonia water with pH=11 to adjust ZrB 2 The pH value of the slurry was always 9, and the stirring was continued with a stirrer. After the dropwise addition of the mixed solution was completed, the stirring was continued for 1 hour, and the pH value was kept at 9. The precipitate was separated by centrifugation, washed three times with deionized water, and then washed once with absolute ethanol, dried at 80°C, and calcined at 500°C to obtain Al 2 o 3 and Y 2 o 3 common putamen ZrB 2 Core-shell Si of powder particles 3 N 4 Composite powder raw material.

Embodiment 2

[0018] 3 g Si 3 N 4 Add the powder into 100ml of water, ultrasonically disperse for 5 minutes, stir evenly, and use 120 minutes to Si 3 N 4 Add 200ml of 0.04mol / L zirconium hypochlorite solution dropwise into the slurry at a constant speed, and at the same time drop into the precipitant ammonia water with pH=11 to adjust Si 3 N 4 The pH value of the slurry was always 5, and the stirring was continued with a stirrer. After the dropwise addition of the mixed solution was completed, the stirring was continued for 1 hour, and the pH value was kept at 5. The precipitate was separated by centrifugation, washed three times with deionized water, and then washed once with absolute ethanol, dried at 100°C, and calcined at 700°C to obtain ZrO 2 shell core Si 3 N 4 Core-shell Si of powder particles 3 N 4 Composite powder raw material.

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Abstract

The invention relates to a chemical preparation method of core-shell Si3N4 compound powder, comprising the following steps: salt solution is added into mixed slurry of Si3N4 powder and water, the mixed slurry stirred evenly at the constant temperature of 10-100 DEG C,, precipitator solution with the pH value of 7-12 is added so that the salt solution can generate precipitated substance core-shell on the surface of ZrB2 powder particle, stirring and reaction is continued for 0.5-6 h, then the core-shell Si3N4 compound powder is prepared after separation, washing, drying under 80-150 DEG C and calcination under 300-700 DEG C. Therefore, the problem that the performance of the Si3N4 ceramic material is reduced as the Si3N4 ceramic material is easily oxidized under high temperature is solved. The method has the characteristics of simple and convenient operation, easy control and low energy consumption, the prepared core-shell ZrB2 compound powder raw material has good physical and chemical performance, the core-shell property of the core-shell layer, such as thickness, density, homogeneity, and the like, can be accurately controlled by adjusting the concentration of the salt solution and the pH value of the precipitator solution.

Description

Technical field [0001] The invention relates to a chemical preparation method of an inorganic powder with anti-oxidation properties, in particular to a core-shell Si 3 N 4 Chemical preparation method of composite powder. Background technique [0002] The development of modern high-temperature technology requires materials to have excellent high-temperature comprehensive properties to adapt to harsh operating environments. Oxide-non-oxide composite materials are a kind of promising high-temperature structural materials, which make use of the complementarity of material properties to achieve comprehensive optimization of materials, Si 3 N 4 Composite ceramic materials are one of them. [0003] Silicon nitride is widely used in high-temperature structural components, such as high-tech fields such as aviation, aerospace, and nuclear energy, because of its advantages such as high temperature resistance, high strength, low thermal expansion coefficient, low density, and good t...

Claims

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Application Information

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IPC IPC(8): C01B21/068
Inventor 宋杰光纪岗昌李世斌杜大明张联盟
Owner JIUJIANG UNIVERSITY
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