Anti-high-temperature and abrasion-resistant electric arc spraying cored wire containing cerium oxide and rhenium, coating and preparation method of coating

A powder core wire material and arc spraying technology, which is applied in metal material coating process, coating, fusion spraying, etc., can solve the problems of decreased wear resistance of the coating, short service life of the coating, and slow particle flying speed , to achieve the effect of improving strength and high temperature wear resistance, improving high temperature wear resistance, and good abrasion resistance

Active Publication Date: 2016-07-27
MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating temperature of the existing boiler protective coating is 600-800°C. Under the high temperature and high pressure environment of supercritical or ultra-supercritical boilers, the anti-wear performance of the coating will drop sharply, and the service life will be greatly reduced, which cannot meet the work requirements.
[0004] At present, ordinary electric arc is generally used for spraying the protective coating of arc sprayed boilers. Due to the slow flying speed of ordinary arc particles, the overall performance of the coating is poor, especially in terms of bonding strength, which is generally 20-30MPa, which leads to the The layer is severely worn and easily peeled off under the impact of dust particles, and the service life of the coating is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The substrate for spraying is 12Cr1MoVG. The 304L stainless steel strip with a specification of 12mm (width) × 0.3mm (thickness) is selected as the outer skin, and the mass percentage of the composition of the drug core is: Cr: 15wt%; B: 8wt%; Ni: 1%; CeO 2 : 1wt%; Re: 8wt%; Fe: balance. The wire is rolled using the wire rolling technique. The filling rate of the powder core wire material is 30%.

[0025] Clean the surface of the substrate with acetone, and dry it in an incubator at 40°C to remove oil stains on the surface. Sandblasting is carried out in the manner described above.

[0026] Supersonic arc spraying is used to spray the powder core wire material in this example, the air pressure is 75PSI, the propane pressure is 73PSI, the wire feeding rate is 20%, the moving speed of the spray gun is 500mm / s; the spraying distance is 120mm, and the high temperature and wear resistance etched coating.

[0027] In this example, the thickness of the coating is 350 μm, ...

Embodiment 2

[0029] The substrate for spraying is 20G steel. The 316L stainless steel strip with a specification of 12mm (width) × 0.3mm (thickness) is selected as the outer skin, and the mass percentage of the composition of the drug core is: Cr: 18wt%; B: 10wt%; Ni: 1.5%; CeO 2 : 0.5wt%; Re: 6wt%; Fe: balance. The wire is rolled using the wire rolling technique. The filling rate of the powder core wire material is 32%.

[0030] Clean the surface of the substrate with acetone, and dry it in an incubator at 45°C to remove oil stains on the surface. Sandblasting is carried out in the manner described above.

[0031] Supersonic arc spraying is used to spray the powder core wire in this example, the air pressure is 78PSI, the propane pressure is 76PSI, the wire feed rate is 25%, the moving speed of the spray gun is 550mm / s; the spraying distance is 150mm, and the obtained high temperature and wear-resistant etched coating. In this example, the thickness of the coating is 450 μm, and the ...

Embodiment 3

[0033] The substrate for spraying is 12Cr1MoVG. The 304L stainless steel strip with a specification of 12mm (width) × 0.3mm (thickness) is selected as the outer skin, and the mass percentage of the composition of the drug core is: Cr: 20wt%; B: 7wt%; Ni: 2%; CeO 2 : 1wt%; Re: 5wt%; Fe: balance. The wire is rolled using the wire rolling technique. The filling rate of the core wire material is 33%.

[0034] Clean the surface of the substrate with acetone, and dry it in an incubator at 40°C to remove oil stains on the surface. Sandblasting is performed in the above manner.

[0035] Supersonic arc spraying is used to spray the powder core wire material in this example, the air pressure is 75PSI, the propane pressure is 73PSI, the wire feeding rate is 20%, the moving speed of the spray gun is 500mm / s; the spraying distance is 120mm, and the high temperature and wear resistance etched coating.

[0036] In this example, the thickness of the coating is 400 μm, and the porosity of...

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Abstract

The invention discloses an anti-high-temperature and abrasion-resistant electric arc spraying cored wire containing cerium oxide and rhenium. The cored wire is formed by rolling a stainless steel coated flux core. The flux core comprises, by mass percentage, 15-25 wt% of Cr, 6-10 wt% of B, 1-3 wt% of Ni, 0.5-2 wt% of CeO2, 5-10 wt% of Re, and the balance Fe. The invention further discloses a preparation method for preparing an anti-high-temperature and abrasion-resistant coating through the electric arc spraying of the cored wire. The porosity of the coating is smaller than 1%, the microhardness of the coating is greater than 720HV0.2, the bonding strength of the coating is 55 MPa or more, the use temperature of the coating is increased by 200-300 DEG C compared with that of an ordinary coating, the production cost is low, the preparation method is reliable, performance is stable, and the coating is suitable for being applied and popularized in the field of high-temperature use environments such as four walls of supercritical and ultra-supercritical boilers.

Description

technical field [0001] The invention belongs to the technical field of material surface strengthening, in particular to a cerium oxide (CeO 2 ) and rhenium (Re) high temperature and wear resistant powder core wire material, coating and preparation method thereof. Background technique [0002] Thermal power generation is the main power generation method in my country. As one of the three major main equipments of thermal power plants, power plant boilers develop along with the development of my country's thermal power industry. my country's thermal power generation usually uses coal as the main fuel. At the same time, due to the high sulfur content in low-quality coal, the heating surface of the "four tubes" of thermal power plant boilers has serious high-temperature wear and corrosion, causing leakage or even bursting tubes, resulting in " "Non-stop" will not only cause serious economic losses, but also may endanger the operation safety of the power plant. Therefore, the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/131C22C38/54C22C32/00
CPCC22C32/0015C22C38/005C22C38/54C23C4/06
Inventor 陈小明吴燕明周夏凉赵坚伏利毛鹏展
Owner MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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