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High-toughness zirconia-based composite powder and preparation method thereof

A zirconia-based, composite powder technology, applied in zirconia, chemical instruments and methods, magnesia, etc., can solve problems such as large surface area, poor molding effect, and poor toughness

Active Publication Date: 2019-05-03
CENT SOUTH UNIV
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Problems solved by technology

[0004] Based on this, the present invention provides a method for preparing high-toughness zirconia-based composite powder by means of surface induction, which solves the problem that the zirconia powder prepared by the above process has poor toughness performance of ceramics, and the surface area is too large and the molding effect is poor. question

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  • High-toughness zirconia-based composite powder and preparation method thereof
  • High-toughness zirconia-based composite powder and preparation method thereof

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preparation example Construction

[0038] A method for preparing coated alumina nano-yttrium stabilized zirconia composite powder by surface-induced coating, the preparation method comprising the following steps:

[0039] (1) Reaction solution preparation method: prepare zirconium oxychloride, yttrium chloride, metal salt of the third period, dispersant raw material solution, its Zr 4+ Concentration 0.1~2.5mol / L, Zr 4+ with Y 3+ The molar concentration ratio is 99:2~90:20, Zr 4+ The ratio of the molar concentration of metal ions to the metal salt of the third period is 99:1~90:10. The concentration of dispersant is 0.5~5g / L. Under the condition of 0.5-6 mol / L ammonia solution or 0.1-3 mol / L hydrochloric acid solution through the atomizer at 1-10000 mL / min to adjust the raw material solution H + Concentration, so that Zr in the solution 4+ Partial hydrolysis to generate crystal nuclei, adjust the solution H + The concentration is 0.1-5mol / L to control the amount of crystal nuclei generated by hydrolysis, th...

Embodiment 1

[0045] (1) Preparation of ZrOCl 2 , YCl 3 , MgCl 2 , mixed solution of hydroxypropyl cellulose, wherein Zr 4+ :Y 3+ :Mg 2+ The molar ratio is 89:6:8, the raw material solution is placed in the reaction kettle, and the H of the final reaction solution is adjusted by adding 2.8mol / L dilute ammonia solution under 60°C water bath and 500r / min stirring. + concentration, so that the solution final C Zr 4+ =1.0mol / L, H + The concentration is 1.2mol / L, and the concentration of hydroxypropyl cellulose is 0.5g / L to obtain the hydrothermal reaction solution;

[0046] (2) Transfer the solution obtained in step (1) to a polytetrafluoroethylene-lined stainless steel reactor, heat to 160°C for hydrothermal hydrolysis, and cool after reacting for 12 hours to obtain a hydrated zirconia suspension;

[0047] (3) Add 10% ammonia water to the hydrated zirconia suspension at 60°C and 500r / min at 10mL / min to make Y 3+ / Mg 2 + Uniformly precipitate on the surface of the hydrated zirconia p...

Embodiment 2

[0050] (1) Preparation of ZrOCl 2 , YCl 3 , MgCl 2 , mixed solution of hydroxypropyl cellulose, wherein Zr 4+ :Y 3+ :Mg 2+ The molar ratio is 89:6:8, the raw material solution is placed in the reaction kettle, and the H of the final reaction solution is adjusted by adding 5.95mol / L dilute ammonia solution in a water bath at 60°C and stirring at 500r / min. + concentration, so that the solution final C Zr 4+ =1.6mol / L, H + The concentration is 1.2mol / L, and the concentration of hydroxypropyl cellulose is 0.5g / L to obtain the hydrothermal reaction solution;

[0051] (2) Transfer the solution obtained in step (1) to a polytetrafluoroethylene-lined stainless steel reactor, heat to 160°C for hydrothermal hydrolysis, and cool after reacting for 12 hours to obtain a hydrated zirconia suspension;

[0052] (3) Put the suspension at 60°C and 500r / min, add 10% ammonia water at 10mL / min to make Y 3+ / Mg 2+ Uniformly precipitate on the surface of hydrated zirconia particles, stop a...

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Abstract

The invention relates to a high-toughness zirconia-based composite powder and a preparation method thereof. The preparation method comprises the following steps: mixing zirconium salt, yttrium salt, third-period metal salt and a dispersant, and adjusting the concentration of H+ in an obtained mixture; carrying out a hydrothermal reaction so as to obtain a hydrated zirconia suspension; adjusting the pH value of the hydrated zirconia suspension to alkaline, and carrying out standing and aging; centrifuging an above-mentioned mixed solution, carrying out washing, drying and calcining, uniformly mixing a calcined powder with deionized water and a dispersant, carrying out ball milling so as to obtain a slurry, and subjecting the slurry to fine grinding, centrifuging, washing and drying so as toobtain the high-toughness zirconia-based composite powder. The ceramic prepared from the above-mentioned nanometer zirconia-based ceramic powder has excellent mechanical properties, especially high fracture toughness, and is specifically applicable to being used as a 5G mobile phone back sheet material.

Description

technical field [0001] The invention relates to the technical field of powder material preparation, and more specifically relates to a high-toughness zirconia-based composite powder and a preparation method thereof. Background technique [0002] Zirconia is a very important structural material. Rare earth-doped stabilized zirconia, especially yttrium-doped stabilized zirconia, has low thermal conductivity, good strength and toughness, low elastic modulus, high thermal shock resistance, and high operating temperature. Among various metal oxide ceramics, zirconia is second only to alumina ceramics in importance. Zirconia ceramics is a very complex system. One of the fatal weaknesses of pure zirconia ceramics is its "brittleness", that is, it has poor fracture toughness due to volume expansion caused by phase transformation. After zirconia forms a solid solution or composite with yttrium oxide, magnesium oxide, cerium oxide, etc., it shows various excellent characteristics, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02C01F17/00C01F5/02
Inventor 刘智勇刘志宏李启厚洪明浩江道言朱银
Owner CENT SOUTH UNIV
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