Method for preparing hydrophobic coating by using hot spraying technology

A thermal spraying and water coating technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of unable to form micro-nano papillary structure, difficult to ensure micro-nano structure and so on

Active Publication Date: 2012-06-27
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spraying micron-sized powder directly, the coating is mainly micron structure, unable to form micronano papillary structure
Direct spraying of nano-powder, the coating will have a micron-scale structure formed by the melting of some nanoparticles, and some nano-structures will remain, but it is difficult to ensure that the micro-nano structure is exactly the "papillary" structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Select 500g of nickel powder with a particle size between 8-10μm and 0.5g of alumina powder with a particle size between 150-200nm as raw materials, mix well, add 40g of alkyd varnish and 30g of thinner, and mix well in an adhesive agglomerator . Drying treatment at 80°C for 1 to 2 hours in a vacuum environment, curing and removing the diluent, spraying the powder, using plasma spraying, controlling the spraying power to 16kw, and the powder feeding amount to 20g / min, to obtain a papillae structure. The surface is coated with a layer of polytetrafluoroethylene with a thickness of 0.01mm to obtain a hydrophobic coating.

Embodiment 2

[0019] Select 500g of nickel powder with a particle size between 8-10μm and 2.5g of alumina powder with a particle size between 100-150nm as raw materials, mix well, add 50g of alkyd varnish and 50g of thinner, and mix well in an adhesive agglomerator . Under a vacuum environment, dry at 80°C for 1 to 2 hours, solidify and remove the diluent, spray the powder, and use supersonic flame spraying, in which the oxygen flow rate and kerosene powder delivery rate are 30g / min, and the papillae structure is obtained. On the surface, apply a layer of silicone coating with a thickness of 0.015mm to obtain a hydrophobic coating.

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PUM

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Abstract

The invention relates to a method for preparing a hydrophobic coating by using a hot spraying technology. The coating has the anti-icing effect. The method comprises the following steps of: coating nano ceramic powder on the surface of micro metal or alloy powder by adopting a nano agglomeration coating technology to form composite powder, preparing the coating by using the composite powder as a raw material and adopting the hot spraying technology, and forming a micro and nano composite 'mastoid process' structure on the surface of the coating so as to improve the hydrophobic effect of the coating. The method is simple in process and high in coating preparation efficiency, can be widely applied in the industries of aviation, printing, automobiles, power and the like, and plays a hydrophobic and anti-icing role.

Description

technical field [0001] The invention relates to a thermal spraying coating preparation technology, in particular to a method for preparing a hydrophobic coating by utilizing the thermal spraying technology. Background technique [0002] In the environment of high altitude, low temperature and cloud cover, water will accumulate and freeze into ice on the outer surface of the aircraft (such as wings and tail), the front end of the engine air intake and other parts. Icing of the tail / wings will damage its streamlined shape and cause the aircraft to lose its lift; icing at the air intake may cause the engine to lose its ability to start. The above hazards may lead to major accidents. [0003] An effective way to prevent icing is to prepare a hydrophobic coating on the surface that is prone to icing. This coating can prevent water droplets from spreading and make them gather into large water droplets, which will detach from the surface of the substrate with the action of external...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/04B22F1/02C23C4/18
Inventor 高峰张淑婷任先京沈婕侯伟骜张乐赵晓东鲍君峰
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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