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Plasma-etching-resistant granulated yttrium oxide for hot spraying and preparation method thereof

A technology of ion corrosion and yttrium oxide, which is applied in the field of thermal spraying, can solve the problems of uneven plasma corrosion resistance of thermal spraying coatings, uneven thickness of thermal spraying coatings, and influence on powder stability, so as to improve energy utilization rate, Uniform plasma corrosion resistance and stable supply

Active Publication Date: 2015-02-11
CHANGZHOU GEOQUIN NANO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sphericity of the thermal spray powder will also have a certain impact on the quality of the thermal spray coating. If the sphericity is not good, it will affect the stability of the powder supply during thermal spraying, and the thickness of the thermal spraying coating will be uneven. Therefore, it will also cause uneven plasma corrosion resistance of thermal sprayed coatings.
In order to improve the sphericity of the thermal spray powder after sintering, it is often necessary to use some methods to spheroidize it, which undoubtedly increases the investment in equipment and increases the production cost.

Method used

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  • Plasma-etching-resistant granulated yttrium oxide for hot spraying and preparation method thereof
  • Plasma-etching-resistant granulated yttrium oxide for hot spraying and preparation method thereof

Examples

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Embodiment 1

[0032] A preparation method of granulated yttrium oxide for plasma corrosion-resistant thermal spraying of the present invention is carried out according to the following steps:

[0033] (1) Mix 10 kg of yttrium oxide powder with a purity of ≥99.99% and a particle size of 0.2 μm with deionized water at a weight ratio of 1:2, and stir evenly to prepare a slurry;

[0034] (2) inject the slurry into a depolymerization machine for depolymerization and reduction, and the depolymerization time is 30 minutes; the D50 of the slurry after depolymerization is 0.4 μm;

[0035] (3) Stir the slurry after depolymerization and reduction, take 80 g of malic acid crystals and add 160 g of deionized water to fully dissolve it, add it to the slurry, and accelerate the stirring. The pH value of the slurry is 6, and the viscosity is 15 mPa·s;

[0036] (4) Slurry is made into yttrium oxide spherical powder by thermal expansion pelletizing equipment again;

[0037] (5) Perform high-temperature dens...

Embodiment 2

[0040] A preparation method of granulated yttrium oxide for plasma corrosion-resistant thermal spraying of the present invention is carried out according to the following steps:

[0041] (1) Mix 10kg of yttrium oxide powder with a purity of ≥99.99% and a particle size of 0.07um with absolute ethanol at a weight ratio of 1:2, and stir evenly to prepare a slurry;

[0042] (2) inject the slurry into a depolymerization machine for depolymerization and reduction, and the depolymerization time is 30 minutes; the D50 of the slurry after depolymerization is 0.1 μm;

[0043] (3) Stir the slurry after depolymerization and reduction, take 100 g of crystal mixture of malic acid, acetic acid, and oxalic acid (4:3:3 by weight) and add 200 g of deionized water to fully dissolve it, add it to the slurry, and accelerate Stir, the pH value of the slurry is 6, and the viscosity is 17mPa·s;

[0044] (4) Slurry is made into yttrium oxide spherical powder by thermal expansion pelletizing equipment a...

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Abstract

The invention belongs to the technical field of hot spraying, and particularly relates to plasma-etching-resistant granulated yttrium oxide for hot spraying and a preparation method thereof. The preparation method of the plasma-etching-resistant granulated yttrium oxide for hot spraying comprises the following steps: preparing nano or ultrafine yttrium oxide powder and deionized water or an organic solution into a paste, performing depolymerization and reduction, adding surface activity activator into the paste for preparation, and performing hot expansion balling and high-temperature densification treatment to obtain the granulated yttrium oxide for hot spraying. According to the invention, the surface activity activator is added into the paste before hot expansion balling, so that the prepared granulated yttrium oxide for hot spraying is favorable in spherical degree, and the high-spherical-degree favorable-flowability high-density granulated yttrium oxide for hot spraying can be obtained without later spheroidization, thereby achieving favorable flowability during hot spraying, ensuring that the supply of the granulated yttrium oxide for hot spraying is more stable, and providing a guarantee for obtaining a hot spray coating having a uniform thickness.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying, and in particular relates to a granulated yttrium oxide for plasma corrosion-resistant thermal spraying and a preparation method thereof. Background technique [0002] Yttrium oxide has high melting point, phase stability and low thermal expansion, and is an important raw material for preparing high-performance electronic ceramics and anti-plasma corrosion spray powder. And the application of yttrium oxide in the fields of aviation, aerospace, and ceramics also shows its superior performance. It is mainly used to manufacture magnetic materials for microwaves and important materials for military industry. It is also used as an additive for optical glass, ceramic materials, and high-brightness for large-screen TVs. Phosphors and other kinescope coatings. It is also used to manufacture high-temperature strong heat-resistant alloys, aircraft nozzles, etc. In recent years, yttrium oxide powd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/505C04B35/622C04B35/632
Inventor 施丽萍
Owner CHANGZHOU GEOQUIN NANO NEW MATERIALS
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