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Preparation method of yttrium oxide stabilized zirconium oxide powder based on supercritical dispersion roasting

A technology for stabilizing zirconia and yttrium oxide, applied in the field of material chemistry, can solve the problems of powder morphology and particle size that cannot meet high-end applications, large powder particle size, low production efficiency, etc. The effect of large particle size and high cost

Active Publication Date: 2019-08-02
SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the precipitate formed is colloidal, which is difficult to filter and wash, and the powder directly calcined has a large particle size, which requires subsequent grinding treatment. Not only is the production efficiency low, but the shape and particle size of the obtained powder also meet Does not meet the requirements of high-end applications

Method used

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  • Preparation method of yttrium oxide stabilized zirconium oxide powder based on supercritical dispersion roasting
  • Preparation method of yttrium oxide stabilized zirconium oxide powder based on supercritical dispersion roasting
  • Preparation method of yttrium oxide stabilized zirconium oxide powder based on supercritical dispersion roasting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 97kg of zirconium carbonate and 3kg of yttrium carbonate and add them to the boiling dryer, control the hot air inlet temperature to 135°C, and after drying for 2 hours, the outlet air temperature is stable at 85°C, and the drying is stopped. The dried material is the precursor material for preparing yttria-stabilized zirconia (3.4mol% YSZ).

[0037] Add 40kg of ethanol to the dispersion tank of the nano sand mill in advance, slowly add 30kg of the above precursor material under the stirring state, and add 150g of polyethylene glycol (PEG4000) dispersant at the same time, grind for 3 hours, and analyze the particle size D 10 63.7nm, D 50 It is 109nm, and it is discharged into barrels.

[0038] The autoclave is preheated to 300°C, the pressure is 8MPa, and the above-mentioned grinding slurry is transported into the autoclave by a metering pump (flow rate 40%), and then sprayed into the calciner from the outlet through the ignition gun. The temperature in the calci...

Embodiment 2

[0041] Weigh 92kg of zirconium carbonate and 8kg of yttrium carbonate and add them into the boiling dryer, control the hot air inlet temperature to 150°C, and after drying for 1.5 hours, the outlet air temperature is stable at 90°C, and the drying is stopped. The dried material is the precursor material for preparing yttria-stabilized zirconia (10mol% YSZ).

[0042] Add 20kg of ethanol to the dispersion tank of the nano sand mill in advance, slowly add 10kg of the above precursor material under the stirring state, and add 100g of polyethylene glycol (PEG4000) dispersant at the same time, grind for 2 hours, and analyze the particle size D 10 72.7nm, D 50 It is 130nm, and it is discharged into barrels.

[0043] The autoclave is preheated to 280°C and the pressure is 7MPa. The above-mentioned grinding slurry is transported into the autoclave by a metering pump (flow rate 40%), and then sprayed into the calciner from the outlet through the ignition gun. The temperature in the calci...

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Abstract

The invention discloses a preparation method of yttrium oxide stabilized zirconium oxide powder based on supercritical dispersion roasting. The method comprises the following steps: first, weighing zirconium salt and yttrium salt, mixing the zirconium salt with the yttrium salt to prepare a precursor material of the yttrium oxide stabilized zirconium oxide powder, and drying the precursor material; mixing the dried precursor material with a grinding auxiliary agent and a dispersing agent, grinding the mixture into the d10 being less than 100 nm and d50 being greater than 150 nm in a nano-sandmill; continuously conveying the ground slurry into a high-pressure kettle with the temperature being greater than 250 DEG C and the pressure being greater than 6.5 MPa through a metering pump, and spraying the slurry into a calcining furnace for combustion from an outlet, wherein the precursor is dispersed by the grinding auxiliary agent and the dispersing agent which are in a supercritical stateand is decomposed into the yttrium oxide stabilized zirconium oxide powder in the calcining furnace. The yttrium oxide stabilized zirconium oxide powder prepared with the method has small particle size, uniform particle size and nearly spherical morphology, and can meet the requirement of high-end application.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a preparation method of yttria-stabilized zirconia powder. Background technique [0002] Among many inorganic materials, zirconia has the advantages of stable chemical properties, high melting point, small thermal expansion coefficient, strong thermal stability and good plasticity, and is widely used in high-tech fields such as military industry, energy, metallurgy, electronics, communications, automobiles, machinery, etc. . [0003] Zirconia has a monoclinic phase (m-ZrO 2 ), tetragonal phase (t-ZrO 2 ) and cubic zirconia (c-ZrO 2 ) three crystal forms. Pure zirconia products will undergo phase transition and fragmentation during cooling from high temperature to room temperature. Therefore, it is necessary to add a certain amount of stabilizer (such as: Y 2 o 3 , CeO 2 , CaO, MgO, BaO and Al 2 o 3 etc.), to prevent or partially prevent the phase change of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02C04B35/48
CPCC01G25/02C01P2002/72C01P2004/03C01P2004/04C01P2004/82C04B35/48C04B2235/3246Y02P20/54
Inventor 李清湘林榆滨邓杰伏志宏陈端云江皇义周少强钟勇
Owner SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY
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