Seawater erosion abrasion and biologic defiling resistant composite ceramic powder for hot spraying and preparation therefor
A composite ceramic, corrosion and wear technology, applied in the material field of surface engineering, can solve the problems of difficult adaptability of water working medium, pollution of the environment by anti-fouling components, deviation of the proportion of ceramic powder, etc., and achieves easy control of process parameters and excellent resistance. The effect of seawater corrosion and wear and less structural defects
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Embodiment 1
[0043] Ingredients: Take 9.8 kg of ceramic powder material with a particle size of 1-10 μm, which contains 64% Cr 2 o 3 , 10%TiO 2 , 6% Al 2 o 3 , 20% Cu, then add 0.2 kg of polyvinyl alcohol adhesive, after fully mixing, then add 10 kg of clean water and stir to form a uniformly dispersed and suspended slurry for later use.
[0044] Atomization drying: 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 depending on its own surface tension. Drying in hot air, the heating temperature of the drying tower heater is 110-300 °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.
[0045] High-temperature sintering and screening: put the prepared agglomerated powde...
Embodiment 2
[0047] Ingredients: Take 9.5 kg of ceramic powder material with a particle size of 1-10 μm, which contains 85.5% Cr 2 o 3 , 9.5%TiO 2 , 5% CuO, then add 0.1 kg of dextrin, 0.2 kg of polystyrene and polyvinyl alcohol adhesive, after fully mixing, then add 12 kg of clean water and stir into a uniformly dispersed and suspended slurry for use.
[0048] Atomization drying: Spray the slurry into the drying tower with a centrifugal atomizing nozzle. The rotational speed of the centrifugal atomizer is 18000-20000r / min. The atomized slurry particles shrink into a solid spherical shape by their own surface tension. Medium drying, the heating temperature of the drying tower heater is 110-300°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.
[0049] High temperature sintering and sieving: same as embodiment 1. The test results of the composite ...
Embodiment 3
[0051] Ingredients: Take 9.8 kg of ceramic powder material with a particle size of 1-10 μm, which contains 64% Cr 2 o 3 , 16%TiO 2 , 20% Cu 2 0, then add each 0.1 kilogram of carboxymethyl cellulose and polystyrene binder, after fully mixing, then add 13 kilograms of clean water and stir into a uniformly dispersed and suspended slurry for later use.
[0052] Spray drying: with embodiment 1.
[0053] High temperature sintering and sieving: same as embodiment 1. The test results of the composite ceramic powder obtained in this example are listed in Table 3.
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