Spherical yttrium oxide powder for thermal spraying and preparation method thereof

By dissolving yttrium oxide raw materials and performing concurrent reaction precipitation, combining two-step spray granulation and two-step roasting methods, the existing spherical yttrium oxide powder has been solved, and the preparation of spherical yttrium oxide powder with high purity and high density is achieved, reducing production costs.

CN119683671AActive Publication Date: 2025-03-25INNER MONGOLIA RARE EARTH FUNCTIONAL MATERIALS INNOVATION CENT CO LTD +1
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Patent Information

Application Number
CN202510220586.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-27
Publication Date
2025-03-25
Estimated Expiration
2045-02-27

AI Technical Summary

Technical Problem

The existing spherical yttrium oxide powder for thermal spraying has problems such as high impurities, low spherical shape, low loose density, low spherical formation rate, and high porosity, which is difficult to meet the requirements of high purity and high density.

Method used

Nitrate is used to dissolve the yttrium oxide raw material, and yttrium hydroxide and alkaline mixed yttrium are obtained through co-current reaction and precipitation. Two-step spray granulation and two-step calcination are carried out to obtain spherical yttrium oxide powder with high purity and high density.

Benefits of technology

The spherical yttrium oxide powder with high purity, extremely high spherical shape and high yield is achieved, reducing production costs and equipment requirements, and improving product stability and density.

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Abstract

The invention belongs to the technical field of rare earth thermal spraying, and particularly relates to spherical yttrium oxide powder for thermal spraying and a preparation method of the spherical yttrium oxide powder. The preparation method comprises the following steps: dissolving a yttrium oxide raw material with nitric acid to obtain a yttrium nitrate solution; sequentially carrying out parallel flow reaction, aging, washing and filtering on part of the yttrium nitrate solution and ammonia water to obtain yttrium hydroxide; sequentially carrying out parallel flow reaction, aging, washing and filtering on the residual yttrium nitrate solution and the mixed precipitant to obtain alkaline mixed yttrium; the preparation method comprises the following steps: mixing yttrium hydroxide and alkaline mixed yttrium with water, then adding a dispersing agent and an adhesive step by step, stirring, and carrying out spray granulation to obtain granulated powder; roasting the granulated powder, adding water, carrying out ball milling, then adding the dispersing agent and the adhesive step by step again, and carrying out secondary spray granulation to obtain secondary granulated powder; and sintering the secondary granulation powder at high temperature, and screening. The spherical yttrium oxide powder obtained through the method is high in absolute purity, high in balling rate, good in fluidity, high in apparent density and low in porosity.
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Citation Information

Patent Citations

  • Method for preparing nano spherical yttrium oxide powder for thermal spraying

    CN102145913A

  • Preparation method of spherical yttrium oxide powder for high apparent density thermal spraying

    CN112209419A

  • Preparation method of nanoscale yttrium oxide powder

    CN112209420A

  • Preparation method of solid spherical AT13 spraying feed without screening

    CN113292324A

  • Method for producing spherical yttria particulate

    JP2005263528A

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