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Nano structure yttrium stabilized zirconium oxide aggregated powder and its producing method

A technology of yttrium-stabilized zirconia and nano-zirconia, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems that the actual application of production is too far from the scale, the production cost is increased, and it is difficult to achieve scale. Effects of eliminating relaxation and internal stress, 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

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 production 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 structure yttrium stabilized zirconium oxide aggregated powder and its producing method
  • Nano structure yttrium stabilized zirconium oxide aggregated powder and its producing method
  • Nano structure yttrium stabilized zirconium oxide aggregated powder and its producing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 10 kg containing 6wt% Y 2 o 3 Nano ZrO 2 (Partially stabilized yttrium oxide) powder, with an average crystal particle size of 20nm, was added with 15 kg of ultra-pure water, stirred evenly, uniformly dispersed with a colloid mill for 10 minutes, and prepared into a stable suspension slurry for use.

[0041] 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, and the atomized slurry shrinks into an agglomerated spherical shape depending on its own surface tension, and is dried The air inlet temperature of the tower is controlled at 200°C, and the air outlet temperature is controlled at 120°C, so that the aerosol droplets are fully dried in the hot air. The dry agglomerated powder is then drawn into a cyclone separator by suction for collection.

[0042] Sieve the collected powder with a mechanical sampling sieve. The particle size range of the fi...

Embodiment 2

[0054] Take 10 kg containing 6wt% Y 2 o 3 Nano ZrO 2 (Partially stabilized yttrium oxide) powder, with an average crystal particle size of 20nm, was added with 15 kg of ultra-pure water, stirred evenly, uniformly dispersed with a colloid mill for 10 minutes, and prepared into 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 agglomerated spherical shape by virtue of their own surface tension, and are dried in the hot air. The drying tower The heating temperature of the heater is controlled at 200°C to quickly evaporate the water in the mist droplets, and the dry agglomerated powder is collected by a cyclone separator. Sieve the collected powder with a mechanical sampling sieve. The particle size ranges from 40 to 100 μm (ie, 150 to 350 mesh). The powder with a particle size greater than 100 μm and ...

Embodiment 3

[0067] Take 10 kg containing 8wt% Y 2 o 3 Nano ZrO 2 (Partially stabilized yttrium oxide) powder, with an average crystal particle size of 10nm, was added with 20 kg of ultra-pure water, stirred evenly, uniformly dispersed with a colloid mill for 10 minutes, and prepared into a stable suspension slurry for use.

[0068] 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, and the atomized slurry shrinks into an agglomerated spherical shape depending on its own surface tension, and is dried The air inlet temperature of the tower is controlled at 240°C, and the air outlet temperature is controlled at 150°C, so that the aerosol droplets are fully dried in the hot air. The dry agglomerated powder is then drawn into a cyclone separator by suction for collection.

[0069] Sieve the collected powder with a mechanical sampling sieve. The particle size range of the fi...

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Abstract

The nanometer structure yttrium stabilized aggregated zirconium oxide powder consists of nanometer crystal particle of size smaller than 100 nm and is in aggregated powder structure in granularity of 40-90 microns. Inside the aggregated structure, the nanometer zirconium oxide particles are contacted partially with pure cavity inside. The production process includes adding water into nanometer zirconium oxide particle containing yttrium oxide to obtain aquatic suspended colloid, and subsequent spray drying, sieving, heat treatment and plasma densifying. The production process is simple, low in cost, continuous and suitable for industrial production, and the product is suitable for plasma spraying, flame spraying, etc. and may be used in preparing various kinds of heat resisting coating, wear resisting coating and anticorrosive coating in various industry.

Description

technical field [0001] The invention relates to a nanostructured yttrium-stabilized zirconia agglomerated powder material and a production method thereof. The powder material is particularly suitable for preparing thermal barrier coatings by thermal spraying (plasma spraying or flame spraying) or structural ceramics by high-temperature sintering. Background technique [0002] Zirconia (ZrO 2 ) has excellent physical and chemical properties and is an important structural and functional ceramic material. Ordinary zirconia exists in a monoclinic phase at room temperature to 1170 °C, transforms into a tetragonal phase when heated to 1170-2370 °C, and transforms from a tetragonal phase to a cubic phase (melting at about 2700 °C) above 2370 °C. Since the high temperature phase (cubic phase or tetragonal phase) of pure zirconia will transform into a low temperature phase (monoclinic phase) as the temperature decreases, accompanied by a volume expansion of ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C04B35/48C04B35/626
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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