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Method for preparing high-dispersion yttria-stabilized zirconia powder

A technology of yttrium-stabilized zirconia and high dispersion is applied in the field of preparation of yttrium-stabilized zirconia powder, which can solve the problems of unsolved hard agglomeration of ultrafine powder, poor powder dispersibility, low sintering activity, etc., so as to improve the agglomeration problem , good dispersibility, the effect of improving powder performance

Inactive Publication Date: 2017-07-14
ZHEJIANG JINKUN ZIRCONIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of this co-precipitation method is that it does not solve the problem of hard agglomeration of ultrafine powder, poor dispersion of powder, and low sintering activity.

Method used

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  • Method for preparing high-dispersion yttria-stabilized zirconia powder
  • Method for preparing high-dispersion yttria-stabilized zirconia powder
  • Method for preparing high-dispersion yttria-stabilized zirconia powder

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preparation example Construction

[0027] A preparation method of highly dispersed yttrium-stabilized zirconia powder, such as figure 1 shown, including the following steps:

[0028] Step 1, put Y 2 o 3 Dissolve in acid, heat and stir until completely dissolved, and prepare solution A; the acid is one of concentrated hydrochloric acid or concentrated nitric acid; acid and Y 2 o 3 The molar ratio is greater than 6:1; the heating temperature is 40-50°C.

[0029] Step 2, solution A and tensio-active agent that step 1 obtains are added to ZrOSO 4 ·nH 2 O slurry, heat and stir evenly to form a mixed solution B; the surfactant is polyethylene glycol (PEG400), cetyltrimethylammonium bromide (CTAB), polyacrylic acid (PAA) or dodecyl One of sodium alkylbenzenesulfonate (SDBS); ZrOSO 4 ·nH 2 O slurry concentration is 0.1~3mol / L; Y 2 o 3 Molar content of ZrOSO 4 ·nH 2 1% to 10% of the molar content of O; the mass of the surfactant is ZrOSO 4 ·nH 2 O 0.1‰~10‰ of slurry volume; heating temperature is 50~120℃. ...

Embodiment 1

[0033] Weigh 6.984g Y 2 o 3 (0.031mol), dissolved in 30ml of concentrated hydrochloric acid, heated and stirred until completely dissolved. Add the above solution and 1ml PEG400 into 1000ml basic zirconium sulfate slurry with a concentration of 1mol / L, stir and heat to 70-75°C. Slowly add the guanidine aqueous solution dropwise to the mixed solution to make the pH = 8-10, and keep stirring while adding dropwise. After the dropwise addition, the stirring was continued for 2 h, and then the reaction was stopped to obtain a white zirconium hydroxide suspension. The precipitate was alternately centrifuged and washed with deionized water and absolute ethanol, and then dried at 80°C. The dried precipitate was calcined at 1100°C for 3 hours to obtain yttrium-stabilized tetragonal zirconia powder. The obtained zirconia powder is pressed into tablets and sintered at 1460°C, and the density reaches 6.05g / cm 3 , Vickers hardness up to 1290N / mm 2 .

Embodiment 2

[0035] Weigh 6.984g Y 2 o 3 (0.031mol), dissolved in 30ml of concentrated hydrochloric acid, heated and stirred until completely dissolved. Add the above solution and 0.5g CTAB into 1000ml basic zirconium sulfate slurry with a concentration of 1mol / L, stir and heat to 70-75°C. Slowly add tetramethylammonium hydroxide aqueous solution dropwise to the mixed solution to make the pH = 8-10, and keep stirring while adding dropwise. After the dropwise addition, the stirring was continued for 2 h, and then the reaction was stopped to obtain a white zirconium hydroxide suspension. The precipitate was alternately centrifuged and washed with deionized water and absolute ethanol, and then dried at 80°C. The dried precipitate was calcined at 1100°C for 3 hours to obtain yttrium-stabilized tetragonal zirconia powder. The obtained zirconia powder is pressed into tablets and sintered at 1460°C, and the density reaches 6.08g / cm 3 , Vickers hardness up to 1300N / mm 2 .

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Abstract

The invention discloses a method for preparing high-dispersion yttria-stabilized zirconia powder. According to the method, zirconium basic sulfate adopted as a zirconium source and organic alkali serving as a precipitator are heated to prepare zirconia powder with good dispersibility, small grain size and uniform size under assistance of surfactant. The zirconia powder with excellent performance, good dispersibility, excellent uniformity and adjustable grain size can be obtained by selecting the reactant concentration and varieties of organic alkali and surfactant and adjusting experiment parameters. By compressing and sintering, the powder has a density of 6.08g / cm3 and Vickers hardness of 1300N / mm<2>.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a preparation method of highly dispersed yttrium-stabilized zirconia powder. Background technique [0002] Zirconia (ZrO 2 ) is a metal oxide material with high melting point (2700°C) and high boiling point, small thermal conductivity, large thermal expansion coefficient, high temperature resistance, good wear resistance and excellent corrosion resistance. Zirconium dioxide is white and has stable chemical properties. Except for sulfuric acid and hydrofluoric acid, it has good stability to acids, alkalis and alkali melts, glass melts and molten metals. Low thermal conductivity, good thermal stability is ZrO 2 main features of . Pure ZrO 2 The deformation temperature of dense sintered body is as high as 2400-2500℃, and the general industrial pure ZrO 2 The creep temperature of the produced products also reaches 2200°C. Therefore, it is an ideal mater...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/626C04B35/63
CPCC04B35/48C04B35/626C04B35/6303C04B2235/3225C04B2235/5445C04B2235/602C04B2235/656C04B2235/77C04B2235/96
Inventor 江婷婷骆兵周志永
Owner ZHEJIANG JINKUN ZIRCONIUM IND
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