Nanostructured yttrium stable zirconium oxide agglomerate type powder and its production method

A technology of yttrium-stabilized zirconia and nano-zirconia is applied in the field of thermal spraying process to prepare thermal barrier coating or high temperature sintering process to prepare structural ceramics. Cost increase and other issues, to achieve the effect of eliminating relaxation phenomenon and internal stress, easy to popularize and low cost

Active Publication Date: 2006-04-26
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 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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  • Nanostructured yttrium stable zirconium oxide agglomerate type powder and its production method
  • Nanostructured yttrium stable zirconium oxide agglomerate type powder and its production method
  • Nanostructured yttrium stable zirconium oxide agglomerate type powder and its production method

Examples

Experimental program
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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

[0049] 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.

[0050] 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

[0057] 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.

[0058] 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.

[0059] Sieve the collected powder with a mechanical sampling sieve. The particle size range of the fi...

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Abstract

The Yt stabilized zirconia aggregate powder consists of nanometer crystal particles smaller than 100 nm and has grain size of 40-90 microns. The nanometer zirconia particles inside aggregate powder contact to form cavities among them. The Yt stabilized zirconia aggregate powder is prepared through adding water into nanometer zirconia particle containing yttrium oxide to obtain suspended colloid, spraying drying, sieving, heat treatment, and plasma densifying. The present invention has simple technological process, simple operation and low cost and is suitable for continuous industrial production. The product is suitable for making various kinds of high temperature heat barrier coating and heat resistant antiwear anticorrosive coating through different kinds of hot spraying process, and is applied in various industries.

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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/488C04B35/626
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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