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A method for reducing longitudinal cracks in thermally sprayed super stainless steel coatings

A longitudinal crack, stainless steel technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of local corrosion of thermal sprayed super stainless steel, achieve porosity reduction, crack propagation inhibition, reduce the number and The effect of size

Active Publication Date: 2022-03-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for reducing longitudinal cracks of thermal sprayed super stainless steel coatings, which is used to solve the problem of longitudinal cracks in thermal sprayed super stainless steel after being impacted and then lead to localized corrosion, thereby greatly improving the resistance of the coating Impact corrosion resistance

Method used

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  • A method for reducing longitudinal cracks in thermally sprayed super stainless steel coatings
  • A method for reducing longitudinal cracks in thermally sprayed super stainless steel coatings
  • A method for reducing longitudinal cracks in thermally sprayed super stainless steel coatings

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Mix 270-500-mesh super stainless steel powder with 325-220-mesh alumina powder at a volume ratio of 1:1, and prepare doped alumina on the surface of 5mm thick carbon steel (150mm×75mm) by HVAF supersonic flame spraying method Particle super stainless steel coating; and the super stainless steel coating is prepared by supersonic stainless steel metal powder by HVAF supersonic flame spraying method as a reference for subsequent performance evaluation.

[0028] The thickness of the coating prepared in this embodiment is about 500 microns, and the X-ray diffraction pattern of the super stainless steel coating is as follows figure 1 As shown, the coating structure is basically a face-centered cubic structure. Al appears in the alumina coating 2 o 3 phase, the SiC phase appears when mixed into the silicon carbide coating. The porosity of the super stainless steel coating is shown in Table 1. It can be seen that the porosity of the coating is significantly reduced after the...

Embodiment 2

[0036] Mix 270-500-mesh super stainless steel powder with 325-220-mesh silicon carbide powder at a volume ratio of 1:1, use the mixed powder to prepare a super stainless steel coating containing silicon carbide particles by HVAF supersonic flame spraying, and The super stainless steel coating was prepared by supersonic stainless steel metal powder by HVAF supersonic flame spraying method as a reference for subsequent performance evaluation.

[0037]The X-ray diffraction pattern of the super stainless steel coating that the present embodiment prepares is as figure 1 As shown, the coating structure is basically a face-centered cubic structure. The SiC phase appears when mixed into the silicon carbide coating.

[0038] The porosity of the super stainless steel coating is shown in Table 1. It can be seen that the porosity of the coating is significantly reduced after the silicon carbide particles are mixed.

[0039] The coating mixed with silicon carbide particles in this exampl...

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Abstract

The invention discloses a method for reducing the generation of longitudinal cracks in a thermal sprayed super stainless steel coating, which belongs to the technical field of thermal spraying. In this method, inert ceramic particles are mixed into super stainless steel powder, and then the mixed powder is thermally sprayed onto the surface of the substrate. The density is improved; on the other hand, some ceramic particles can be embedded into the metal coating, which can inhibit the crack propagation during the impact process of the coating. The metal powder and ceramic particles are uniformly mixed according to the volume ratio of 1:1, and the ceramic particles are selected from alumina or silicon carbide. The ceramic particles of the present invention can increase the density of the coating, and can reduce the expansion of longitudinal cracks in the coating, effectively reducing the longitudinal cracking of the thermal sprayed stainless steel coating, and are suitable for improving the performance of corrosion-resistant and wear-resistant metal coatings in corrosive impact environments. service life.

Description

technical field [0001] The invention relates to the technical field of thermal spraying, in particular to a method for reducing longitudinal cracks of thermal spraying super stainless steel coatings. Background technique [0002] Large-scale steel parts will have excessive wear and corrosion in the service environment. In view of the excessive corrosion caused by wear and corrosion of the core parts of the equipment, the process of repairing the size of parts by preparing super stainless steel coatings has attracted widespread attention. . As a surface repair and protective coating, super stainless steel not only has low cost, but also exerts its excellent wear resistance and corrosion resistance. At present, it has been successfully applied or has shown broad application prospects in the fields of electric power, marine, petrochemical and nuclear industries. [0003] At present, the preparation of super stainless steel coating mainly adopts thermal spraying method. Among...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06
CPCC23C4/129C23C4/06
Inventor 王德斌张锁德唐全吕威闫杨柏俊孙文海王建强
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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