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Method for preparing nano spherical yttrium oxide powder for thermal spraying

A yttrium oxide and thermal spraying technology, applied in chemical instruments and methods, nanotechnology, inorganic chemistry, etc., can solve the problems of low yield, difficulty in sintering and densification of agglomerates, low dehydration efficiency of original particles, etc., and reduce energy consumption. and cost, solve the effect of low dehydration efficiency, controllable powder purity and particle size

Inactive Publication Date: 2011-08-10
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low dehydration efficiency of primary particles, difficulty in sintering and densification of agglomerates, and low yield in the preparation process of traditional nano-yttrium oxide powder for thermal spraying, and to provide an economical, environmentally friendly and suitable for industrialization. Preparation method of nano-spherical yttrium oxide powder for thermal spraying in large-scale production

Method used

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Examples

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preparation example Construction

[0026] A preparation method of nano-spherical yttrium oxide powder for thermal spraying, the preparation process comprises the following steps:

[0027] (1) Add a certain amount of Y to the concentrated nitric acid solution 2 o 3 Powder, formulated as Y(NO 3 ) 3 solution; then adjust the pH value of the solution with ammonia water, and keep stirring until a white precipitate is formed; age the precipitate for several hours, filter and wash 2 to 4 times with absolute ethanol; then vacuum-dry to obtain a fluffy white powder precursor body.

[0028] (2) Through the high-energy plasma flame flow generated by the water-stabilized plasma spray gun, the Y 2 o 3 The precursors were instantaneously decomposed, dehydrated and collected by distilled water to obtain nano-Y 2 o 3 original grain.

[0029] (3) For nano-Y 2 o 3 Press filter the solution of the original particles to adjust the proportion of water; then add a certain proportion of binders, dispersants, etc. to adjust ...

Embodiment 1

[0038] The steps of preparing high-purity nano-spherical yttrium oxide powder for thermal spraying are as follows:

[0039] (1) Take 20 kg of industrial high-purity Y with a purity ≥ 99.99% and an average particle size of 5-10 μm 2 o 3 Powder raw material, dissolved in concentrated nitric acid, prepared into Y(NO 3 ) 3 solution; then adjust the pH value of the solution to 9 with ammonia water with a concentration of 2 mol / L, and keep stirring until a white precipitate is formed; age the precipitate for 8 to 10 hours, filter it and wash it with absolute ethanol for 2 to 3 times, and then Vacuum drying at 80°C for 4 hours yielded a fluffy white powder precursor.

[0040] (2) Through the high-energy plasma flame flow produced by the water-stabilized plasma spray gun, Y 2 o 3 The precursor was instantaneously decomposed, dehydrated and collected by distilled water to obtain nano-Y with a grain size of less than 80 nm 2 o 3 original grain. The working medium of water stable...

Embodiment 2

[0045] The steps of preparing high-purity nano-spherical yttrium oxide powder for thermal spraying are as follows:

[0046] (1) Take 20 kg of industrial high-purity Y with a purity ≥ 99.99% and an average particle size of 5-10 μm 2 o 3 Powder raw material, dissolved in concentrated nitric acid, prepared into Y(NO 3 ) 3 solution; then adjust the pH value of the solution to 9 with ammonia water with a concentration of 2 mol / L, and keep stirring until a white precipitate is formed; age the precipitate for 8 to 10 hours, filter it and wash it with absolute ethanol for 2 to 3 times, and then Vacuum drying at 80°C for 4 hours yielded a fluffy white powder precursor.

[0047] (2) Through the high-energy plasma flame flow produced by the water-stabilized plasma spray gun, Y 2 o 3 The precursor was instantaneously decomposed, dehydrated and collected by distilled water to obtain nano-Y with a grain size of less than 80 nm 2 o 3 original grain. The working medium of water stable...

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Abstract

The invention relates to a method for preparing nano spherical yttrium oxide powder for thermal spraying, in particular to a method for preparing the spherical yttrium oxide powder aggregated with high-purity nano crystal particles. The method for preparing the nano spherical yttrium oxide powder for thermal spraying is characterized in that the preparation process comprises the following steps of: (1) adding Y2O3 powder into salpeter solution, adding ammonia into the salpeter solution for precipitation and carrying out ageing processing, filtering, washing and drying to obtain a powder precursor; (2) processing the Y2O3 precursor by a water stable plasma gun to obtain nano original particles of Y2O3 and collecting the nano original particles of Y2O3 by distilled water; (3) adding a binder and a dispersing agent to carry out size mixing and ball milling, and pelletizing by spraying and drying; (4) carrying out sintering treatment by an air plasma gun; and (5) sieving. By the method, the problems of low dehydrating efficiency, difficulty in sintering and densifying aggregate, low yield and the like are solved. The purity and the granularity of the powder are controllable. The method is suitable for industrial scale production. The prepared yttrium oxide powder has high purity. Crystal particles are good. The liquidity and the adaptability of spraying process of apparent density are high. The prepared yttrium oxide powder has great market potential. Obvious economic benefits can be created.

Description

technical field [0001] The invention discloses a preparation method of nano-spherical yttrium oxide powder for thermal spraying, which relates to a preparation method of spherical yttrium oxide powder agglomerated by high-purity nano-crystal grains. Background technique [0002] Yttrium oxide has heat resistance, corrosion resistance, high temperature stability, high dielectric constant and a series of excellent physical and chemical properties. It is mainly used as a functional material in aviation, aerospace, electronics, atomic energy and high-tech ceramics industries. Among them, Nano Y 2 o 3 Powder has attracted people's attention because of its excellent performance in the fields of light, electricity, and physical and chemical reactions, and its market potential is huge. [0003] For example, in recent years, the technology of preparing ceramic layer instead of anodized aluminum coating on the surface of etching machine reaction chamber and electrostatic chuck by th...

Claims

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Application Information

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IPC IPC(8): B82Y40/00C01F17/00
Inventor 于月光曾克里任先京冀晓鹃侯伟骜章德铭张鑫沈婕周恒
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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