Aluminium/yttrium zirconium tertiary composite oxide nano structure aggregate powder and its producing method

A ternary composite and nanostructure technology, which is applied in the field of thermal spraying to prepare thermal barrier coatings or high-temperature sintering to prepare structural ceramics, can solve the problems of large-scale production, high production costs, and the gap between actual production and large-scale production. and other problems, to achieve the effect of easy control of process parameters, low cost and easy promotion

Inactive Publication Date: 2005-03-02
湖北葛店开发区地大纳米材料制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prepared powder is spherical in shape and the particle size is consistent. The disadvantage is that the production cost is increased and it is difficult to realize large-scale production.
In addition, some of the above preparation methods are used in combination with plasma spray pyrolysis, supercritical drying, etc., and only some limited research and discussion have been carried out, which is far from the actual application and scale of production.

Method used

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  • Aluminium/yttrium zirconium tertiary composite oxide nano structure aggregate powder and its producing method
  • Aluminium/yttrium zirconium tertiary composite oxide nano structure aggregate powder and its producing method
  • Aluminium/yttrium zirconium tertiary composite oxide nano structure aggregate powder and its producing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Dissolve 20 kg of zirconium oxychloride in 100 liters of water, add 0.1 mol / liter of aluminum nitrate and yttrium nitrate solution to control Y 2 O 3 In ZrO 2 The doping amount in the powder is 4wt%, Al 2 O 3 The doping amount is 2wt%. A certain amount of ethanol is added, and 50% ammonia water (volume ratio) is added dropwise under strong stirring until the pH value of the solution is greater than 9. The ceramic membrane separates the hydroxide precipitate, and the precipitate is washed with distilled water until no chloride ions are detected in the filtrate (silver nitrate test). Centrifuge or filter the precipitate, mix the hydroxide precipitate with 2 times the weight ratio of butanol, treat it with a colloid mill or stir vigorously. Placed in a distillation drying and dehydration device, dehydrated at 150°C until the powder is completely dry, and calcined the powder in a high-temperature furnace at 800°C for 2 hours. A ternary composite nano-oxide powder particle raw m...

Embodiment 2

[0054] Prepare ternary composite oxide powder according to the method of Example 1. Take 10 kilograms of the powder, add 15 kilograms of ultra-pure water, stir evenly, and uniformly disperse with a colloid mill for 10 minutes to prepare a stable suspension slurry for use.

[0055] Use a centrifugal atomizing disc to spray the slurry into the drying tower. The rotating speed of the centrifugal atomizer is 10000r / min. The atomized slurry particles shrink into agglomerated spheres by their own surface tension. They are dried in hot air and heated by the drying tower. The heating temperature of the device is controlled at 180°C to quickly evaporate the moisture in the droplets, and the dry agglomerate powder is collected by a cyclone separator. The collected powder is sieved with a mechanical sample sieve, the particle size range is between 40-100μm, and the powder with the particle size greater than 100μm and less than 40μm is used as the regrind material, and the slurry will be made...

Embodiment 3

[0061] Prepare ternary oxide nanopowder according to the method of Example 1, wherein Al 2 O 3 The content is 3wt%, Y 2 O 3 The content is 8wt%, the calcination temperature is 600°C, and the average particle size of the crystal is 10nm.

[0062] Take 10 kilograms of nano-oxide powder, add 20 kilograms of ultra-pure water, stir evenly, and use a colloid mill to evenly disperse for 10 minutes to prepare a stable suspension slurry for use.

[0063] Use purified compressed air as the carrier gas, the gas pressure is controlled at 0.3-0.8MPa, and the two-fluid nozzle is used to spray the slurry into the drying tower. The atomized slurry shrinks into agglomerated spheres by its own surface tension. The drying tower The temperature of the air inlet is controlled at 200°C, and the temperature of the air outlet is controlled at 130°C, so that the aerosol droplets are fully dried in the hot air. Then, the dried agglomerate powder is drawn into the cyclone separator to be collected by suctio...

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Abstract

The nanometer tertiary composite Al-Y-Zr oxide aggregate powder features that it is nanometer ZrO2 powder containing Al2O3 in 0.3-30 wt% and Y2O3 in 3-9 wt%. The grains have average crystal granularity of 5-60 nm, and the nanometer oxide particles in the aggregate powder are surface contacted with pure cavity in the no-contact parts. The preparation process of the nanometer tertiary composite Al-Y-Zr oxide aggregate powder includes adding water to the nanometer tertiary composite Al-Y-Zr oxide grain to obtain water suspension colloid, spray drying, sieving, heat treatment and plasma densifying. The present invention has simple technological process, simple operation and low production cost and is suitable for continuous industrial production. The product can meet the technological requirement for plasma spraying, flame spraying, electric arc spraying, etc.

Description

Technical field [0001] The invention relates to an aluminum / yttrium / zirconium ternary composite oxide nanostructure agglomerate powder material and its production process. The powder material is particularly suitable for thermal spraying (plasma spraying or flame spraying) processes to prepare thermal barrier coatings or high-temperature sintering Process to prepare structural ceramics. Background technique [0002] Zirconia (ZrO 2 ) With excellent physical and chemical properties, it is an important structural and functional ceramic material. Ordinary ZrO 2 It exists as a monoclinic phase at room temperature to 1170°C, and transforms into a tetragonal phase when heated to 1170°C to 2370°C, and transforms from a tetragonal phase to a square phase (melting at around 2700°C) when it is above 2370°C. As pure ZrO 2 The high temperature phase (cubic phase or tetragonal phase) of the product will transform into the low temperature phase (monoclinic phase) as the te...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/48C04B35/626
Inventor 侯书恩王焰新向龙斌宋自洪陈浩王平
Owner 湖北葛店开发区地大纳米材料制造有限公司
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