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Nano-structured aggregate powder of AI/Yt/Zr ternary compound oxides and its production method

A ternary composite and nano-structure technology, applied in metal material coating process, melt spraying, coating and other directions, can solve the problems such as the difference between actual production application and scale is too far, it is difficult to achieve scale, and the production cost is increased. , to achieve the effect of easy control of process parameters, easy promotion and low cost

Active Publication Date: 2006-04-05
深圳地大纳米材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Nano-structured aggregate powder of AI/Yt/Zr ternary compound oxides and its production method
  • Nano-structured aggregate powder of AI/Yt/Zr ternary compound oxides and its production method
  • Nano-structured aggregate powder of AI/Yt/Zr ternary compound oxides and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take 20 kg of zirconium oxychloride and dissolve it in 100 liters of water, add 0.1 mol / liter of aluminum nitrate and yttrium nitrate solution, 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. A 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). The precipitate is centrifuged or filtered, and the hydroxide precipitate is mixed with 2 times of butanol (weight ratio), treated with a colloid mill or vigorously stirred. Place in a distillation drying dehydration device, dehydrate at 150°C until the powder is completely dry, and calcinate the powder in a high-temperature furnace at 800°C for 2 hours. A ternary composite nano...

Embodiment 2

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

[0055] The slurry is sprayed into the drying tower with a centrifugal atomizing disc. The rotational speed of the centrifugal atomizer is 10000r / min. The atomized slurry particles shrink into a conglomerate spherical shape by virtue of their own surface tension. They are dried in the hot air and heated by the drying tower. The heating temperature of the device is controlled at 180°C to quickly evaporate the water in the mist droplets, and the dry agglomerate powder is collected by a cyclone separator. Sieve the collected powder with a mechanical sampling sieve, keep the particle size range between 40 and 100 μm, and use the powder with a particle size greater than 100 μm and less than 40 μm as the recycle material, and make it int...

Embodiment 3

[0061] Prepare ternary oxide nanopowder by the method for embodiment 1, wherein Al 2 o 3 The content is 3wt%, Y 2 o 3 The content is 8wt%, the calcining temperature is 600°C, and the average particle diameter of the crystal is 10nm.

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

[0063] Purified compressed air is used as the carrying gas, the gas pressure is controlled at 0.3-0.8MPa, and the slurry is sprayed into the drying tower by a two-fluid nozzle. 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. The dried agglomerate powder is then drawn by suction into a cyclone separator for collection.

[0064] The collected powder is sieved with a mechanical sampling sieve. The particle size range of the finished...

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Abstract

The Al / Yt / Zr three-element composite oxide aggregate powder of nano structure comprises 0.3-30wt% Al2O3, 3-9wt% Y2O3 and nano ZrO2 powder particle with average size 5n-60nm. Wherein, the nano oxide particle is body surface contact, other is pure cavity. The opposite preparation method comprises: adding water into the composite oxide for water suspended colloid; spray drying, sieve separating, heat treating, and plasma densifying. This invention is simple and low cost for continual production in scale. The product can satisfy plasma spraying, flame spraying, and other heat spraying technique.

Description

technical field [0001] The invention relates to an aluminum / yttrium / zirconium ternary composite oxide nanostructure aggregate powder material and its production process. The powder material is especially suitable for thermal spraying (plasma spraying or flame spraying) process to prepare thermal barrier coating or high-temperature sintering process for the preparation of structural ceramics. Background technique [0002] Zirconia (ZrO 2 ) has excellent physical and chemical properties and is an important structural and functional ceramic material. Ordinary ZrO 2 It exists as a monoclinic phase at room temperature to 1170°C, transforms into a tetragonal phase when heated to 1170°C-2370°C, and transforms from a tetragonal phase to a cubic phase (melting at about 2700°C) above 2370°C. Since pure ZrO 2 The high-temperature phase (cubic phase or tetragonal phase) will transform into a low-temperature phase (monoclinic phase) as the temperature decreases, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/11
Inventor 王平张润棠宋自洪邱小平陈浩李志明
Owner 深圳地大纳米材料科技有限公司
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