Preparation method of high-temperature-resistant anti-corrosion ceramic coating

A ceramic coating, high temperature resistant technology, applied in the surface field, can solve problems such as affecting the protective effect of the coating

Pending Publication Date: 2021-09-14
JIHUA LAB
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In high temperature and corrosive environments, these holes and microcracks become the preferential passage of oxygen and corrosive media, thereby affecting the protective effect of the coating

Method used

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  • Preparation method of high-temperature-resistant anti-corrosion ceramic coating
  • Preparation method of high-temperature-resistant anti-corrosion ceramic coating

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preparation example Construction

[0033] see figure 1 , a flow chart of the steps for the preparation method of the high-temperature-resistant and anti-corrosion ceramic coating provided by the application, comprising the following steps:

[0034] Step S110: Prepare a nickel-based alloy transition layer on the surface of the substrate by cold spraying technology.

[0035] In some of the embodiments, the main gas of the cold spraying is nitrogen or helium, the pressure is 2-3.5MPa, and the temperature is 300-600°C. The base is steel.

[0036] In some of the embodiments, the composition of the nickel-based alloy is NiCrAlY, the particle size is 15-45 μm, and the shape is spherical or nearly spherical.

[0037] In some of the embodiments, the nickel-based alloy transition layer has a thickness of 150-200 μm.

[0038] It can be understood that the present application adopts cold spraying technology to prepare the nickel-based alloy transition layer. Compared with the traditional thermal spraying transition laye...

Embodiment 1

[0056] The NiCrAlY transition layer was prepared on the surface of the steel substrate by cold spraying equipment. Among them, the main gas of cold spraying is nitrogen, the pressure is 3.5MPa, the temperature is 500°C, the particle size of NiCrAlY raw material powder is 15-45μm, the spraying distance is 30mm, and the spraying time is 2 minutes to form a transition layer with a thickness of 150μm.

[0057] Then PVA, PEG, deionized water and Al 2 o 3 Weighing and mixing, high-energy ball milling for 48 hours, and agglomerated ceramic powders were obtained by spray-drying technique. Wherein, the contents of PVA and PEG are both 1wt.%, the solid content of Al2O3 is 60wt.%, and the particle size of the agglomerated powder after spray drying is 50-75μm.

[0058] Then, a ceramic coating is prepared on the surface of the transition layer by using the plasma spraying technique and the agglomerated ceramic powder. Among them, the plasma spraying power is 40kW, the spraying distance ...

Embodiment 2

[0061] A NiAl alloy transition layer was prepared on the surface of the steel substrate by cold spraying equipment. Among them, the main gas of cold spraying is nitrogen, the pressure is 3.5MPa, the temperature is 400℃, the NiAl alloy raw material powder is Ni-coated Al powder, the particle size is 15-45μm, the spraying distance is 30mm, the spraying time is 2 minutes, and the forming thickness is 200μm transition layer.

[0062] Then PVA, PEG, deionized water and Al 2 o 3 Weighing and mixing, high-energy ball milling for 48 hours, and agglomerated ceramic powders were obtained by spray-drying technique. Among them, PVA and PEG content are 1.5wt.%, Al 2 o 3 The solid content is 60wt.%, and the particle size of the agglomerated powder after spray drying is 50-75 μm.

[0063] Then, a ceramic coating is prepared on the surface of the transition layer by using the plasma spraying technique and the agglomerated ceramic powder. Among them, the plasma spraying power is 45kW, th...

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Abstract

The invention provides a preparation method of a high-temperature-resistant anti-corrosion ceramic coating. A nickel-based alloy transition layer is prepared on the surface of a substrate through a cold spraying technology, the ceramic coating is prepared on the surface of the nickel-based alloy transition layer, and the surface of the ceramic coating is remelted. According to the preparation method of the high-temperature-resistant anti-corrosion ceramic coating provided by the invention, the nickel-based alloy transition layer is prepared on the surface of a steel substrate through cold spraying, and the problems that as a traditional thermal spraying technology is adopted for preparing the transition layer, tensile stress is left in the coating, cracks and stripping are caused due to the fact that the tensile stress is easily and continuously increased in the subsequent thermal spraying of the ceramic coating are solved, and the internal stress of the cold spraying coating is pressure stress, a part of tensile stress generated by heating can be offset, then the binding force between the transition layer and the ceramic coating is improved, the outer surface layer of the prepared high-temperature-resistant anti-corrosion ceramic coating is compact, the inner layer of the prepared high-temperature-resistant anti-corrosion ceramic coating is porous, and the binding strength between the ceramic coating and the transition layer and the binding strength between the transition layer and the substrate are high, the high-temperature-resistant and corrosion-resistant performance is excellent, and the service life is long.

Description

technical field [0001] The invention belongs to surface technology, and in particular relates to a preparation method of a high-temperature-resistant and anti-corrosion ceramic coating. Background technique [0002] Steel has always been the most widely used material in various fields such as construction, industry, and military affairs, such as four-tube boilers, lithium battery kilns, and marine equipment. The harsh environment of high temperature and corrosion often leads to problems such as oxidative discoloration, cracks, and skin peeling of steel. Even ordinary stainless steel is difficult to use for a long time above 400-500°C and in corrosive environments. Using surface strengthening technology to improve the high temperature resistance and anti-corrosion performance of the steel surface is currently the most effective solution. [0003] At present, thermal spraying ceramic coatings are often used in industry for surface strengthening. During the thermal spraying p...

Claims

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Application Information

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IPC IPC(8): C23C24/04C23C4/11C23C4/18C23C4/129C23C4/131C23C4/134C23C28/00
CPCC23C24/04C23C4/11C23C4/18C23C4/129C23C4/131C23C4/134C23C28/3215C23C28/345
Inventor 卢静解路但幸东陈东孙澄川吴应东
Owner JIHUA LAB
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