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Prepn of nanometer aggregated zirconia powder for hot spraying

A technology of zirconia powder and thermal spraying, which is applied to the device and coating of the surface coating liquid, which can solve the problems of difficult large-scale production, high cost, and the difference between the actual application of production and the large-scale production, and achieve the goal of equipment The effect of simplicity, low cost, and easy control of process parameters

Inactive Publication Date: 2005-07-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also problems of high cost and difficulty in achieving large-scale production
In addition, there are some studies and discussions on combining the above preparation methods with plasma spray pyrolysis and supercritical drying, but they are still far from the actual application and scale of production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 9.8 kilograms of yttrium oxide partially stabilized nano-zirconia powder (its ZrO 2 with Y 2 o 3 The mass ratio is 93:7), adding 0.2 kg of polyvinyl alcohol adhesive, after mixing thoroughly, then adding 10 kg of clean water and stirring to form a uniformly dispersed and suspended slurry for use.

[0026] Use dry and pure compressed air as the carrying gas, the gas pressure is controlled at 0.8Mpa, and the slurry is sprayed into the drying tower by a two-flow nozzle. The atomized slurry shrinks into a reunited hollow spherical shape by its own surface tension, and is dried in hot air , The heating temperature of the drying tower heater is controlled between 150 and 280 ° C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by means of an aspirator. The collected powder is sieved with a mechanical sieve, and the powder between 180-325 mesh sieves is tak...

Embodiment 2

[0035] Get 9.5 kilograms of yttrium oxide partially stabilized nano-zirconia powder (its ZrO 2 with Y 2 o 3 The mass ratio is 94:6), add 0.1 kg of dextrin, 0.2 kg of polystyrene and polyvinyl alcohol adhesives, mix thoroughly to form a 10 kg solid mixture, then add 10 kg of clean water and stir until uniform Disperse and suspend the slurry for use.

[0036] Spray the slurry into the drying tower with a centrifugal atomizing nozzle. The rotational speed of the centrifugal atomizer is 800-2000r / min. The atomized slurry particles shrink into a solid spherical shape by their own surface tension, and are dried in hot air. The heating temperature of the tower heater is controlled between 150 and 280 ° C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by means of an aspirator. The collected powder is sieved with a mechanical sieve, and the powder between 180-325 mes...

Embodiment 3

[0045] Get 9.8 kilograms of yttrium oxide partially stabilized nano-zirconia powder (its ZrO 2 with Y 2 o 3 The mass ratio is 94:6), adding 0.1 kg of carboxymethyl cellulose and polyvinyl alcohol adhesive, mixed thoroughly to make 10 kg of solid mixture, and then adding 10 kg of clean water and stirring to form a uniformly dispersed suspension The slurry is ready for use.

[0046] Use dry and pure compressed air as the carrying gas, the gas pressure is controlled at 0.8Mpa, and the slurry is sprayed into the drying tower by a two-flow nozzle. The atomized slurry shrinks into a reunited hollow spherical shape by its own surface tension, and is dried in hot air , The heating temperature of the drying tower heater is controlled between 150 and 280 ° C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by means of an aspirator. The collected powder is sieved with a ...

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Abstract

The preparation process of nanometer aggregated zirconia powder for spraying includes: mixing nanometer zirconia powder stabilized with 20-60 nm granularity yttrium oxide and adhesive in the mass ratio of 95:5 to 98:2 and adding pure water of 1-1.3 times the mixture weight to compound slurry; spraying at 110-300 deg.c to form micron level aggregated powder; and final plasma nodulizing or sintering to form compact powder of 40-90 micron granularity and with the nanometer crystal structure maintained. The obtained powder may meet the technological requirement of plasma spraying or flame spraying. The technological process is simple, great in output, safe, reliable, low in cost and suitable for continuous industrial production.

Description

technical field [0001] The invention relates to a method for preparing a surface engineering material for thermal spraying, in particular to a method for preparing a nanocrystalline agglomerated zirconia powder material for plasma spraying or flame spraying. Background technique [0002] Zirconia is a partial acidic oxide with a melting point of 2760°C, low thermal conductivity and good chemical stability. It is stable in high temperature oxidation and weak reducing atmospheres, and can withstand SO 2 , CO and CO 2 Corrosion of high temperature gas. But pure ZrO 2 The material is generally not used as a high-temperature resistant coating because of its crystalline transformation that can cause denudation. As the temperature changes, different crystal forms of zirconia crystals will appear: normal temperature to 1000 ° C, monoclinic crystal β-ZrO 2 ; Over 1000°C, transforms into tetragonal α-ZrO 2 , with a volume change of about 7%. When it is cooled again, the monoclin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/08C09D1/00
Inventor 程旭东
Owner WUHAN UNIV OF TECH
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