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SiO2/alpha-Al2O3 ceramic composite coating with high bonding strength and low-temperature preparation method thereof

A combination strength and ceramic composite technology, which is applied in the direction of coating, metal material coating process, liquid chemical plating, etc., can solve the problems of uneven structure, stress corrosion of structural materials, high cost, etc., so as to prevent uneven stress and improve Bonding strength and effect of improving adhesiveness

Active Publication Date: 2021-11-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnetron sputtering has serious limitations for the preparation of inner surface coatings of special-shaped parts such as the inner wall of pipelines; the coating prepared by plasma spraying technology has cracks and holes, and the preparation temperature is high, which will have a thermal impact on the substrate; hot dip coating The use of aluminum and molten salt plating techniques is limited to the preparation of aluminide coatings; chloride ions in the activator chloride used for embedding infiltration can cause severe stress corrosion of structural materials
In addition, the above preparation technologies all have disadvantages such as complex process, high cost, and high production technology requirements.
[0005] Compared with the above preparation techniques, the slurry method is a reliable method for preparing ceramic coatings at low temperature, but due to the difficulty of traditional slurry brushing and dipping methods Control the uniformity and thickness of the coating, so the prepared ceramic coating often has problems such as uneven structure and large thickness, which affects the bonding strength between the coating and the substrate

Method used

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  • SiO2/alpha-Al2O3 ceramic composite coating with high bonding strength and low-temperature preparation method thereof
  • SiO2/alpha-Al2O3 ceramic composite coating with high bonding strength and low-temperature preparation method thereof
  • SiO2/alpha-Al2O3 ceramic composite coating with high bonding strength and low-temperature preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] SiO with high bond strength in this example 2 / α-Al 2 O 3 The preparation method of ceramic composite coating comprises the following steps:

[0034] Step 1: Pretreatment of the substrate

[0035] The 316L stainless steel plate was used as the substrate, and the 25mm × 25mm × 2mm plate-shaped samples were prepared by wire-cutting. Then, the samples were polished with 120# and 240# metallographic sandpaper in turn, and then ultrasonically cleaned with alcohol and dried for later use.

[0036] Step 2: Preparation of Slurry

[0037] 99.99% pure α-Al 2 O 3 The powder and alkaline silica sol (JN-30) with a mass fraction of 30% were respectively weighed and placed in a beaker, and then polyethylene glycol (PEG) was added. Then, the slurry was sonicated at room temperature, and after the sonication was completed, a magnetic stirrer was used to stir the slurry uniformly.

[0038] Among them, α-Al 2 O 3 Powder particle size is 30nm, α-Al 2 O 3 The addition amount of p...

Embodiment 2

[0045] SiO with high bond strength in this example 2 / α-Al 2 O 3 The preparation method of ceramic composite coating comprises the following steps:

[0046] Step 1: Pretreatment of the substrate

[0047] A 316L stainless steel plate was used as the substrate, and a 25mm × 25mm × 2mm plate-like sample was prepared by wire-cutting. Then, the samples were polished with 120# and 240# metallographic sandpaper in turn, and then ultrasonically cleaned with alcohol and dried for later use.

[0048] Step 2: Preparation of Slurry

[0049] 99.99% pure α-Al 2 O 3 The powder and alkaline silica sol (JN-30) with a mass fraction of 30% were respectively weighed and placed in a beaker, and then polyethylene glycol (PEG) was added. Then the slurry was sonicated at room temperature, and after the ultrasonication was completed, the slurry was uniformly stirred with a magnetic stirrer, the rotational speed of the magnetic stirrer was 1000 rpm, and the stirring time was 10 h.

[0050] Among...

Embodiment 3

[0061] SiO with high bond strength in this example 2 / α-Al 2 O 3 The preparation method of ceramic composite coating comprises the following steps:

[0062] Step 1: Pretreatment of the substrate

[0063] The 316L stainless steel plate was used as the substrate, and the 25mm × 25mm × 2mm plate-shaped samples were prepared by wire-cutting. Then, the samples were polished with 120# and 240# metallographic sandpaper in turn, and then ultrasonically cleaned with alcohol and dried for later use.

[0064] Step 2: Preparation of Slurry

[0065] α-Al2O3 powder with a purity of 99.99% and alkaline silica sol (JN-30) with a mass fraction of 30% were respectively weighed and placed in a beaker, and then polyethylene glycol (PEG) was added. Then the slurry was sonicated at room temperature, and after the ultrasonication was completed, the slurry was uniformly stirred with a magnetic stirrer, the rotational speed of the magnetic stirrer was 1500 rpm, and the stirring time was 15 h.

[...

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Abstract

The invention discloses a SiO2 / alpha-Al2O3 ceramic composite coating with high bonding strength. The invention discloses a low-temperature preparation method of the SiO2 / alpha-Al2O3 ceramic composite coating with high bonding strength. The low-temperature preparation method comprises the following steps: step 1, grinding a substrate, and then carrying out ultrasonic cleaning and drying to obtain a pre-treated substrate; step 2, mixing alpha-Al2O3 powder, alkaline silica sol and polyethylene glycol, performing ultrasonic treatment and uniform stirring to obtain slurry; step 3, spin-coating the slurry on the surface of the pre-treated substrate to obtain a pre-treated ceramic coating substrate; and 4, sintering the pre-treated ceramic coating substrate, heating the substrate to 500-700 DEG C at the speed of 0.5-2 DEG C / min, preserving heat for 0.5-1.5 h, and cooling the substrate to room temperature at the speed of 0.5-2 DEG C / min to obtain the SiO2 / alpha-Al2O3 ceramic composite coating. The obtained ceramic composite coating is uniform and compact, small in thickness and high in bonding strength with the substrate.

Description

technical field [0001] The invention relates to the technical field of tritium coating, in particular to a high bonding strength SiO 2 / α-Al 2 O 3 Ceramic composite coating and low temperature preparation method thereof. Background technique [0002] A key issue for fusion reactor realization is to prevent the penetration of tritium into structural materials, and a common approach to solve this problem is to prepare tritium-blocking coatings on the surface of structural materials. [0003] Ceramics have become the first choice for tritium barrier coating materials due to their high strength, high temperature resistance and low tritium permeability. Ceramic tritium blocking coatings can be divided into oxide coatings, non-oxide coatings and their composite coatings. Oxide ceramic coatings have the advantages of high melting point, stable chemical properties, relatively simple preparation process and good tritium resistance, mainly including Cr 2 O 3 , Y 2 O 3 , Er 2 ...

Claims

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Application Information

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IPC IPC(8): C23C18/12
CPCC23C18/1208C23C18/127C23C18/1254C23C18/1241
Inventor 罗来马刘玉兰吴玉程刘东光昝祥
Owner HEFEI UNIV OF TECH
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