Preparation method of ceramic-based composite coating capable of resisting seawater cavitation erosion

A technology of ceramic matrix composite and ceramic coating, applied in coating, metal material coating process, fusion spraying and other directions, can solve the problems of concentrated mechanical impact force, low cavitation resistance of thermal sprayed ceramic coating, etc. Strong corrosion and spalling resistance, excellent cavitation resistance, porosity reduction effect

Active Publication Date: 2017-09-05
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the characteristics of thermal spraying technology itself, there are many pores in the prepared ceramic coating, coupled with the inherent brittleness of ceramic materials, it is easy to induce the concentration of mechanical impact force generated by cavitation collapse, and it is conducive to the initiation and expansion of fatigue cracks. So the cavitation resistance of thermal sprayed ceramic coatings is still not high

Method used

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  • Preparation method of ceramic-based composite coating capable of resisting seawater cavitation erosion
  • Preparation method of ceramic-based composite coating capable of resisting seawater cavitation erosion

Examples

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Effect test

Embodiment 1

[0019] A: Using the atmospheric plasma spraying process, spray and deposit a NiCr transition layer with a thickness of about 50 μm on the 316L stainless steel substrate, and then spray and deposit Al with a thickness of about 250 μm 2 o 3 -13TiO 2 ceramic coating.

[0020] B. Measure 40 mL of epoxy resin and 5 mL of triethylenetetramine, mix them evenly, and then apply them on Al 2 o 3 -13TiO 2 on the surface of the ceramic coating.

[0021] C. Put the sample into the vacuum chamber, pump it to a vacuum of -0.74 bar, and carry out vacuum impregnation for 4 hours, so that polymers such as epoxy resin can infiltrate and fill the pores in the coating.

[0022] D. Place the sample in an oven, raise the temperature to 80°C at 2°C / min, and keep it warm for 4 hours to solidify the polymer immersed in the micropores of the coating.

[0023] E. For cured Al 2 o 3 -13TiO 2 The surface of the ceramic matrix composite coating is ground and polished to remove excess polymer on th...

Embodiment 2

[0026] A: Using the atmospheric plasma spraying process, spray and deposit a CoCrAlY transition layer with a thickness of about 55 μm on the 304 stainless steel substrate, and then spray and deposit a ZrO with a thickness of about 280 μm 2 ceramic coating.

[0027] B. Measure 35 mL of epoxy resin and 5 mL of triethylenetetramine, mix them evenly, and then apply them on ZrO 2 on the surface of the ceramic coating.

[0028] C. Put the sample into the vacuum chamber, pump it to a vacuum of -0.68 bar, and carry out vacuum impregnation for 3 hours, so that polymers such as epoxy resin can infiltrate and fill the pores in the coating.

[0029] D. Place the sample in an oven, raise the temperature to 60°C at 2°C / min, and keep it warm for 3 hours to solidify the polymer immersed in the micropores of the coating.

[0030] E. For cured ZrO 2 The surface of the ceramic matrix composite coating is ground and polished to remove excess polymer on the surface and make the surface roughne...

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Abstract

The invention discloses a preparation method of a ceramic-based composite coating capable of resisting seawater cavitation erosion. The method comprises the specific steps that a metal base material is subjected to sand-blasting roughening and cleaning decontamination treatment, and the metal base material is sequentially sprayed with a metal transition layer, a Al2O3-based or ZrO2-based ceramic coating through atmospheric plasma spraying equipment; epoxy resin and trine are mixed to be uniform, and the surface of the ceramic coating is coated with the mixture; the obtained sample is subjected to vacuum impregnation for 2-5 h under the condition that the vacuum degree is -0.6--0.8 bar; the sample is cured for 3-5 h at the temperature of 50-100 DEG C; the surface of the cured ceramic coating is ground and polished to remove redundant polymer materials on the surface, and the surface of the coating is made flat and smooth. According to the ceramic-based composite coating, the excellent corrosion resistance of the ceramic coating is reserved, and meanwhile the cavitation erosion resistance of the ceramic-based composite coating in seawater is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a ceramic matrix composite coating with excellent cavitation resistance in seawater environment, and belongs to the technical field of surface modification. Background technique [0002] Insufficient quality and shortage of marine materials have become a bottleneck restricting the development of the marine field, and the corrosion-cavitation problem of metal materials in seawater environments is one of the biggest challenges facing marine materials. Metal materials are prone to electrochemical corrosion and pitting corrosion in seawater, which significantly reduces their fatigue resistance; in addition, the mechanical impact generated by cavitation will cause severe peeling of corrosion products or passivation films on the surface of metal materials, making the fresh materials inside With continuous exposure, the corrosion can continue at the high rate of the initial corrosion, and finally forms the dest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/18
CPCC23C4/18C23C4/11C23C4/134
Inventor 侯国梁赵晓琴安宇龙邓雯周惠娣陈建敏
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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