Seawater erosion abrasion and biologic defiling resistant composite ceramic powder for hot spraying and preparation therefor

A technology of composite ceramics, corrosion and wear, applied in the field of surface engineering materials, can solve problems such as difficult adaptability of water working medium, environmental pollution of anti-fouling components, deviation of ceramic powder ratio, etc., to achieve easy control of process parameters and easy promotion , The effect of less tissue defects

Inactive Publication Date: 2008-01-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] ⑤ Adaptability to water working medium
Oxide ceramic powders are often used for ceramic coating working components in seawater environments at home and abroad, but the selection of ceramic powders and the ratio of components between composite ceramic powders are often biased, and no effective anti-microbial fouling in water is added. ingredients; even if anti-biofouling ingredients are partially added, the added anti-fouling ingredients may pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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.

[0045] 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.

[0046] High-temperature sintering and screening: put the prepared agglomerated powder...

Embodiment 2

[0048] 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.

[0049] 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.

[0050] High temperature sintering and sieving: same as embodiment 1. The test results of the composite ...

Embodiment 3

[0052] 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.

[0053] Spray drying: with embodiment 1.

[0054] 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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Abstract

The invention discloses a hot spraying composite ceramic power of sea water corrosive wear resistant and biological defilement resistant and the preparing method. The composite ceramic power comprises 95%-98% material power and 2%-5% binder; the material power comprises 80%-95% reference-phase structure which comprises oxide ceramic principal phase component and close structure accessory component and 5-20% biological defilement resistant component; the oxide ceramic reference-phase structure comprises 80%-90% Cr2O3 and 10%-20% TiO2 or TiO2+Al2O3. The composite ceramic power comprises the following steps: proportioning; drying with atomise; high-sintering; screening. The invention is provided with the simple process, safety and the low cost.

Description

technical field [0001] The invention relates to a surface engineering material for thermal spraying, in particular to an agglomerated seawater corrosion-resistant and biofouling-resistant composite ceramic powder for thermal spraying technology and a preparation method thereof. Background technique [0002] In the 21st century, with the expansion of energy development and activities in the marine field, more and more reciprocating parts began to be used in the marine environment, but the corrosion of seawater, microbial fouling, etc. devices have a large impact. Applying thermal spraying technology to spray a layer of composite ceramic coating on the metal substrate not only overcomes the shortcomings of poor seawater corrosion resistance of metals and high brittleness of ceramics, but also can give full play to the rigidity of metals and the excellent corrosion and wear resistance of ceramics. The high hardness, high stiffness, and high modulus of elasticity of the ceramic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/12C04B35/632
Inventor 程旭东邓飞飞张子军高忠宝杨章富叶卫平毛昉陈明
Owner WUHAN UNIV OF TECH
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