Heat-resistant corrosion-resistant wear-resistant composite coating, preparation method and application

A composite coating and heat-resistant technology, which is applied in the direction of coating, metal material coating process, and device for coating liquid on the surface, etc. It can solve the problems of pores in the coating, etc., and achieve a dense coating without pores and heat resistance Good corrosion resistance and long service life

Active Publication Date: 2019-07-09
ANHUI UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rapid cooling and solidification of the spray powder after high temperature melting, the coating inevitably produces defects such as pores, especially through holes.

Method used

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  • Heat-resistant corrosion-resistant wear-resistant composite coating, preparation method and application
  • Heat-resistant corrosion-resistant wear-resistant composite coating, preparation method and application
  • Heat-resistant corrosion-resistant wear-resistant composite coating, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, the supersonic flame spraying method is used to spray the working layer on the CrZrCu substrate, and the material of the working layer is Cr 3 C 2 -NiCr,Cr 3 C 2 The mass ratio of NiCr and NiCr is 3:1, and the protective layer is not applied to obtain the first pattern, that is, a single coating.

Embodiment 2

[0034] In this embodiment, the surface of pattern one is coated with Al 2 o 3 -SiO 2 -MTMS-Ce(NO 3 ) 3 The protective layer forms a composite coating, and in the protective layer material, Al 2 o 3 -SiO 2 Sol and Ce(NO 3 ) 3 The mass ratio of Al is 100:1.0, Al 2 o 3 -SiO 2 The mass ratio of sol to MTMS is 100:60.

[0035] The protective layer coating steps are:

[0036] (1) Polish and ultrasonically clean Cr in ethanol 3 C 2 -NiCr working layer;

[0037] (2) Preparation of Al 2 o 3 -SiO 2 -MTMS-Ce(NO 3 ) 3 Protective layer sol: first take Al with a particle size of 50nm 2 o 3 -SiO 2 sol, adding Ce(NO 3 ) 3 Stir the particles for 5 minutes until uniform, then add MTMS, and stir magnetically for 3 hours at room temperature;

[0038] (3) Apply the protective layer sol on the Cr by brushing method 3 C 2 -The surface of the NiCr working layer, aged for 3 hours, placed in a muffle furnace, kept at 60°C for 30 minutes, then kept at 120°C for 30 minutes, coole...

Embodiment 3

[0041] In this embodiment, the surface of pattern one is coated with Al 2 o 3 -SiO 2 -MTMS-Ce(NO 3 ) 3 The protective layer forms a composite coating, and in the protective layer material, Al 2 o 3 -SiO 2 Sol and Ce(NO 3 ) 3 The mass ratio of Al is 100:1.0, Al 2 o 3 -SiO 2 The mass ratio of sol to MTMS is 100:60.

[0042] The protective layer coating steps are:

[0043] (1) Polish and ultrasonically clean Cr in ethanol 3 C 2 -NiCr working layer;

[0044] (2) Preparation of Al 2 o 3 -SiO 2 -MTMS-Ce(NO 3 ) 3 Protective layer sol: first take Al with a particle size of 55nm 2 o 3 -SiO 2 sol, adding Ce(NO 3 ) 3 Stir the particles for 5 minutes until uniform, then add MTMS, and stir magnetically for 3 hours at room temperature;

[0045] (3) Apply the protective layer sol on the Cr by brushing method 3 C 2 -The surface of the NiCr working layer, aged for 3 hours, placed in a muffle furnace, kept at 60°C for 30 minutes, then kept at 120°C for 30 minutes, coo...

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Abstract

The invention discloses a heat-resistant corrosion-resistant wear-resistant composite coating, a preparation method and an application. The composite coating comprises a working layer and a protectionlayer, wherein the working layer is a Cr3C2-NiCr coating body, the Cr3C2-NiCr coating body comprises Cr3C2 and NiCr with the mass ratio of 3:1, the protection layer is an Al2O3-SiO2-MTMS-Ce(NO3)3 ceramic/high-molecular composite material, and the Al2O3-SiO2-MTMS-Ce(NO3)3 ceramic/high-molecular composite material comprises Al2O3-SiO2 sol, MTMS (methyltrimethoxysilane) and Ce(NO3)3 with the mass ratio of 100:50-70:0.5-2. The preparation method comprises the following steps that Cr3C2-NiCr powder is sprayed on a base material so as to prepare the working layer; the Cr3C2-NiCr working layer is ground and cleaned; the Al2O3-SiO2-MTMS-Ce(NO3)3 protection layer sol is prepared; and the protection layer sol is coated on the surface of the Cr3C2-NiCr working layer, and is put into a muffle furnaceafter aging, heat preservation is carried out for 30 minutes at the temperature of 60 DEG C, then heat preservation is carried out for 30 minutes at the temperature of 120 DEG C, and cooling is carried out to room temperature along with the furnace to obtain the composite coating. The composite coating has good bonding force between the composite coating and a base body, the coating has fewer dense pores, and is resistant to heat corrosion and good in wear resistance, and the coating is excellent in overall performance and long in service life.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a heat-resistant, corrosion-resistant and wear-resistant composite coating, a preparation method and an application. Background technique [0002] Mold copper plate is the key equipment in the continuous casting process of steel. During the working process, under the joint action of high-temperature molten steel and low-temperature cooling water, it withstands high-temperature oxidation, chemical corrosion, surface wear and thermal fatigue, etc., which make the mold copper plate in Faced with the threat of serious failure during use, it is necessary to protect the surface of the mold copper plate. [0003] Spraying Cr on the copper plate surface of the crystallizer by supersonic flame spraying (HVOF) technology 3 C 2 -NiCr working layer, Cr 3 C 2 -NiCr powder hits the substrate at high speed, which can make the substrate and the sprayed layer have bett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D5/08C23C4/129C23C4/06
CPCB05D5/00B05D5/08C23C4/129C23C4/06
Inventor 张世宏朱广宏王硕煜刘侠倪振航薛召露温永红胡小红解明祥
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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