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Yttrium oxide-based powder with high sintering activity, and preparation method of yttrium oxide-based powder

A technology for sintering active, yttrium oxide

Inactive Publication Date: 2017-06-06
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, research at home and abroad basically prepares yttrium oxide powder doped with auxiliary agent (lanthanum oxide) by solid-state method or wet chemical method, and then sinters it into ceramics; in the above preparation process, lanthanum oxide is uniformly doped In yttrium oxide, although the prepared powder has strong sintering activity, the addition of a large amount of lanthanum oxide additives easily causes lattice distortion, resulting in a decrease in optical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Y 2 o 3 -0.01(Y 0.91 La 0.04 Zr 0.05 ) 2 o 3 (x=0.04, y=0.05)

[0015] Weigh 0.5 mol of yttrium nitrate and dissolve it in deionized water to obtain a 3 mol / l deionized aqueous solution. The aqueous solution is placed in a closed container and heated to 150 °C for 8 hours, then cooled to room temperature. Weigh 0.0091 mol of yttrium nitrate, 0.0004 mol of lanthanum nitrate and 0.0005 mol of zirconium nitrate into the above airtight container to dissolve the added yttrium lanthanum zirconium compound and mix and stir evenly; then drop a certain amount of Ammonia, so that the pH of the whole solution is 9, obtains a precipitate. The precipitate obtained above was filtered, rinsed with deionized water, mixed by ball milling, dried, and kept at 900°C for 8 hours to obtain yttrium oxide-based powder with high sintering activity.

Embodiment 2

[0016] Example 2: Y 2 o 3 -0.2(Y 0.9 La 0.1 ) 2 o 3 (x=0.1, y=0)

[0017] Weigh 0.5 mol of yttrium nitrate and dissolve it in deionized water to obtain a 0.1 mol / l deionized aqueous solution. The aqueous solution is placed in a closed container and heated to 250 °C for 2 hours, then cooled to room temperature. Weigh 0.18 mol of yttrium acetate and 0.02 mol of lanthanum chloride into the above airtight container to dissolve the added yttrium-lanthanum-zirconium compound and mix and stir evenly; then add a certain amount of ammonia water dropwise while stirring to make the whole solution The pH value was 11 and a precipitate was obtained. The precipitate obtained above was filtered, rinsed with deionized water, mixed by ball milling, dried, and kept at 1300°C for 2 hours to obtain yttrium oxide-based powder with high sintering activity.

Embodiment 3

[0018] Example 3: Y 2 o 3 -0.2(Y 0.89 La 0.1 Zr 0.01 ) 2 o 3 (x=0.1, y=0.01)

[0019] Weigh 0.5 mol of yttrium nitrate and dissolve it in deionized water to obtain a 1 mol / l deionized aqueous solution. The aqueous solution is placed in a closed container and heated to 200 °C for 6 hours, then cooled to room temperature. Weigh 0.1 mol of yttrium nitrate, 0.07 mol of yttrium chloride, 0.008 mol of yttrium acetate, 0.01 mol of lanthanum chloride, 0.01 mol of lanthanum acetate, 0.001 mol of zirconium oxychloride and 0.001 mol of zirconium acetate into the above Dissolving the added yttrium-lanthanum-zirconium compound in a closed container, mixing and stirring evenly; then adding a certain amount of ammonia water dropwise while stirring, so that the pH value of the entire solution is 10, and a precipitate is obtained. The precipitate obtained above was filtered, rinsed with deionized water, mixed by ball milling, dried, and kept at 1000°C for 5 hours to obtain yttrium oxide...

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PUM

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Abstract

The invention discloses yttrium oxide-based powder with high sintering activity. The yttrium oxide-based powder has a core-shell structure, a core layer of the core-shell structure is a Y2O3 phase, and a shell layer of the core-shell structure is a (Y, La, Zr)2O3 phase; a preparation process of the yttrium oxide-based powder comprises the following steps: firstly, dissolving a yttrium compound into deionized water, then putting into a closed container, and heating up to 150-250 DEG C to obtain the core layer Y2O3 phase; cooling to room temperature, then adding compounds of Y, La and Zr, stirring for dissolving the compounds, and evenly mixing; after that, dropwise adding ammonia water while stirring so as to obtain a precipitate of the (Y, La, Zr)2O3-coated core layer Y2O3 phase; filtering the precipitate, then carrying out ball mill mixing, and drying; calcining an obtained product at the temperature of 900-1300 DEG C to obtain the yttrium oxide-based powder. The raw materials of the yttrium oxide-based powder are wide in source and easy to obtain, and the preparation technology of the yttrium oxide-based powder is simple and controllable; the Y2O3 phase is coated with the (Y, La, Zr)2O3 phase with excellent sintering performance, so that the yttrium oxide-based powder has the excellent sintering activity.

Description

technical field [0001] The invention relates to an yttrium oxide-based powder and a preparation method thereof, belonging to the technical field of material science. Background technique [0002] Yttrium oxide is a cubic crystal, which has the advantages of high melting point, good chemical and photochemical stability, high thermal conductivity, and good optical transparency at 0.23-8.0 μm. It is an important matrix material for solid-state laser dielectric materials. Yttrium oxide transparent ceramics have a theoretical transmittance of more than 80% in a wide frequency range, especially in the infrared region, so they are often used as various detection equipment and energy windows; due to their high refractoriness, they can also be used as high temperature The observation window and the lens of the furnace. In addition, yttrium oxide transparent ceramics can be used in microwave substrates, wear-resistant surface materials, infrared generator tubes, radome, etc., and has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/505C04B35/628
CPCC04B35/505C04B35/62815C04B2235/443C04B2235/444C04B2235/449
Inventor 王焕平李银艳张晓婷徐时清雷若姗黄立辉
Owner CHINA JILIANG UNIV
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