Preparation method of nanometer aggregated zirconia powder for hot spraying
A technology of zirconia powder and nano-zirconia, which is applied to devices and coatings for coating liquid on the surface, can solve the problems of high cost, the difference between practical application and scale of production, and difficulty in large-scale production, etc. The effect of low cost, easy control of process parameters and simple equipment
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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
[0030] Get 9.5 kilograms of yttrium oxide partially stabilized nano-zirconia powder (its ZrO 2 with Y 2 o 3The 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.
[0031] 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 mesh...
Embodiment 3
[0035] 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.
[0036] 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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