Preparation method for nanometer yttrium doped zirconia powder

A technology of zirconia powder and zirconia powder, which is applied in the field of nano-powder preparation, can solve the problems of difficulty in achieving pure phase, poor sintering activity, and coarse powder particle size when doped with zirconia, so as to achieve easy sintering and formation Effect of low phase temperature and narrow particle size distribution

Inactive Publication Date: 2018-01-05
安徽科昂新材料科技有限公司
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Problems solved by technology

The invention patent with the publication number CN101500943A discloses a method for preparing doped zirconia by solid state reaction of oxides. Due to the high reaction temperature of this method, the particle size of the obtained powder is relatively coarse and the sintering activity is poor.
The invention patent with the publication number CN104837774 A discloses a method for preparing doped zirconia by co-precipitation method. Since zirconia and doped oxides generally precipitate step by step, it is difficult to achieve a pure phase of doped zirconia prepared by this method.

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  • Preparation method for nanometer yttrium doped zirconia powder

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specific Embodiment approach

[0011] As mentioned above, in view of the many defects of the prior art, the inventor of this case proposed a preparation method of nano-yttrium-doped zirconia after long-term research and practice, in order to realize the low-cost, Large-scale and high-performance preparation. The specific embodiment of the present invention is as follows:

[0012] 1) Mix 1 part of inorganic yttrium salt, 8 to 50 parts of inorganic zirconium salt, 20 to 100 parts of solvent 1, and 0.1 to 3 parts of surfactant to form a uniform solution;

[0013] 2) Add 5-100 parts of accelerator to the solution prepared in 1);

[0014] 3) adding solvent 2 to the product obtained in step 2), heating and stirring;

[0015] 4) The product obtained in step 3) is filtered and dried;

[0016] 5) Roasting the product obtained in step 4);

[0017] 6) The powder prepared in step 5) is crushed and granulated to obtain nano-doped zirconia powder.

[0018] Further, the inorganic yttrium salt is one or a mixture of y...

Embodiment 1

[0028] Dissolve 61.28 grams of yttrium nitrate, 311.88 grams of zirconium nitrate and 10 grams of polyethylene glycol 400 in 5000 grams of deionized water. After the dissolution is complete, 300 grams of glycidol is added dropwise and allowed to stand for 5 hours. The obtained solid product is subjected to centrifugal dehydration. Add 20,000 grams of deionized water to the dehydrated solids, heat to 80 degrees, wash at 200 rpm for 3 hours, and then dehydrate the product by centrifugation; Roasting in a furnace at 500°C for 2 hours; dry-milling the calcined powder with a ball mill for 3 hours to obtain nano-doped zirconia powder. The zirconia powder prepared by this method is a fully stable cubic phase, with a primary particle size of 40nm and a secondary particle size of 500nm.

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Abstract

The invention discloses a method for preparing nanometer yttrium doped zirconia through a sol-gel process. The method comprises the following steps: with an inorganic zirconium salt and an inorganic yttrium salt as precursors of yttrium-doped zirconia, dissolving the precursors in a solvent mixed with a surfactant and then gradually adding a promoter; subjecting a product of the previous step to washing, filtering and drying to form initial powder; and then subjecting the initial powder to calcination and crushing to prepare nanometer doped zirconia powder.

Description

field of invention [0001] The invention relates to the field of preparation of nano-powder, in particular to a preparation method of nano-yttrium-doped zirconia ceramic powder. Background technique [0002] Zirconia material (ZrO 2 ) is a new type of structural and functional ceramic material, which has excellent mechanical, thermal, electrical and chemical properties, and is widely used in industrial production and daily life. ZrO 2 There are three crystal forms, which can be transformed into each other: monoclinic crystal form at low temperature (less than 950°C), tetragonal crystal form at 1200°C to 2370°C, and cubic crystal form at 2370°C; Doping such as calcium oxide, magnesium oxide, yttrium oxide, etc. can realize the tetragonal or cubic crystal form of zirconia at room temperature. At present, the methods for preparing doped zirconia mainly include: solid state reaction method, co-precipitation method and so on. The invention patent with the publication number C...

Claims

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Application Information

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IPC IPC(8): C01G25/02B82Y30/00C04B35/48
Inventor 张尚权
Owner 安徽科昂新材料科技有限公司
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