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A heat-resistant, corrosion-resistant and wear-resistant composite coating, its preparation method and application
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A composite coating, heat-resistant technology, applied in coating, metal material coating process, device for coating liquid on the surface, etc., can solve the problem of pores in the coating, achieve dense coating without pores, preparation method Simple, long-lasting effect
Active Publication Date: 2022-01-14
ANHUI UNIVERSITY OF TECHNOLOGY +1
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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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Embodiment 1
[0032] In this embodiment, the supersonic flame spraying method is used to spray the working layer on the CrZrCu substrate, and the working layer material 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 and wear-resistant composite coating, a preparation method and an application thereof. The composite coating includes a working layer and a protective layer, and the working layer is Cr 3 C 2 ‑NiCr coating, Cr 3 C 2 ‑NiCr coating consists of Cr in a mass ratio of 3:1 3 C 2 and NiCr, the protective layer is Al 2 o 3 ‑SiO2 2 ‑MTMS‑Ce(NO 3 ) 3 Ceramic / polymer composite, Al 2 o 3 ‑SiO2 2 ‑MTMS‑Ce(NO 3 ) 3 The ceramic / polymer composite material includes Al with a mass ratio of 100:50-70:0.5-2 2 o 3 ‑SiO2 2 Sol, MTMS (methyltrimethoxysilane), Ce(NO 3 ) 3 . The preparation method comprises the following steps: spraying Cr on the substrate 3 C 2 ‑NiCr powder preparation working layer; grinding and cleaning Cr 3 C 2 ‑NiCr working layer; preparation of Al 2 o 3 ‑SiO2 2 ‑MTMS‑Ce(NO 3 ) 3 protective layer sol; coating the protective layer sol on Cr 3 C 2 ‑NiCr working layer surface, aged and placed in a muffle furnace, kept at 60°C for 30 minutes, then kept at 120°C for 30 minutes, cooled to room temperature with the furnace, and taken out to obtain a composite coating. The composite coating of the invention has good bonding force with the substrate, the coating has less dense pores, good heat corrosion resistance and wear resistance, excellent overall performance of the coating and long 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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