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Rare earth doped nanometer composite ceramic coating and production technology thereof

A rare earth doping and nano-composite technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of low toughness, low bonding strength, limited coating, etc., to achieve improved erosion resistance, The effect of improved corrosion resistance and reliable preparation process

Active Publication Date: 2015-04-15
水利部产品质量标准研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have a certain effect, the effect is not obvious, and there are still relatively serious erosion phenomena, and it is difficult to achieve breakthrough progress.
[0004] In the prior art, supersonic flame spraying can prepare ordinary coatings with a certain protective effect, which has a certain effect on erosion resistance, but the usual coatings have fatal defects such as porosity, poor corrosion resistance, low toughness, and low bonding strength. The coating is easy to fall off under the impact of external force, which limits the application of the coating in the surface protection of hydraulic machinery

Method used

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  • Rare earth doped nanometer composite ceramic coating and production technology thereof
  • Rare earth doped nanometer composite ceramic coating and production technology thereof
  • Rare earth doped nanometer composite ceramic coating and production technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Nano WC-10Co4Cr powder and Sc 2 o 3 mixed, where Sc 2 o 3 The content is 1wt%, and the powder is mixed evenly by using a three-dimensional powder mixing test machine, the rotation speed is 25RPM, and the mixing frequency is 40,000 times.

[0031] Lay the rare earth-doped nano-tungsten carbide powder flat, put it in an incubator for drying, the drying temperature is 120°C, and the drying time is 2 hours.

[0032] Clean and dry the stainless steel surface with acetone and alcohol, and then sandblast the surface to remove impurities such as surface scale. Sandblasting is carried out in the manner described above.

[0033] Fix the substrate 1 of the spraying operation with a fixture, and use a closed-loop supersonic flame spraying equipment to spray rare earth-doped nano-tungsten carbide powder. The spraying process parameters are: kerosene flow rate 24L / h, oxygen flow rate 54m3 / h, feed rate 80g / min, carrier gas flow rate 10L / min, spraying distance 360mm, get rare eart...

Embodiment 2

[0036] Nano WC-10Co4Cr powder and La 2 o 3 mixed, where La 2 o 3 The content is 1.5wt%, and the powder is mixed evenly with a three-dimensional powder mixing test machine, the rotation speed is 25RPM, and the mixing frequency is 40,000 times.

[0037] Lay the rare earth-doped nano-tungsten carbide powder flat, put it in an incubator for drying, the drying temperature is 100°C, and the drying time is 3 hours.

[0038] Clean the stainless steel surface with acetone and alcohol and dry it. The surface blasting treatment is the same as in Embodiment 1.

[0039] Fix the substrate 1 of the spraying operation with a fixture, and use supersonic flame spraying equipment to spray nano-tungsten carbide powder. The spraying process parameters are: kerosene flow rate 28L / h, oxygen flow rate 52m 3 / h, the delivery rate is 70g / min, the carrier gas flow rate is 10L / min, the spraying distance is 400mm, and the rare earth doped nanocomposite ceramic coating 2 is obtained, see figure 1 . ...

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Abstract

A rare earth doped nanometer composite ceramic coating comprises a spray coating, the spray material of the spray coating is rare earth oxide component doped nanometer tungsten carbide powder, the nanometer tungsten carbide powder is nanometer WC-10Co4Cr powder, and the particle size of the particle size of the powder is 15-53[mu]m; and the doped rare earth oxide is Sc2O3, La2O3 or Ce2O3, and the content of the doped rare earth oxide is 0.5-3wt%. The microscopic hardness of the above wear resistant coating is 1350-1450HV0.2, the surface wear resistance of the coating is above 140 times that of ZG06Cr13Ni4Mo, the self corrosion potential and the self corrosion current density of the coating are smaller than those of a common tungsten carbide coating, and the coating provided by the invention has large microscopic hardness, bonding strength and small amount of porosity. A water turbine with the surface sprayed with the coating provided by the invention has greatly improved erosion and corrosion resistance, and the coating prolongs the service life of the surface material of the water turbine 12.5-25 times.

Description

technical field [0001] The invention relates to a rare earth-doped nano-composite ceramic coating and a preparation process thereof. Background technique [0002] In the prior art, hydraulic machinery suffers from various sandstone erosion and cavitation damage to varying degrees. After a period of operation, the hydraulic machinery needs to be shut down for overhaul, and the hydraulic machinery components have to be replaced, especially the key flow-through components of the hydraulic machinery. . In the water flow with high sand content, due to the high-speed erosion and impact of the sediment, it will be severely eroded, causing the material to be damaged and consumed. At the same time, because the water environment contains more corrosive media, such as chloride ions, etc., Large corrosion has occurred on the surface materials of hydraulic machinery components. Under the erosion of sediment and the continuous corrosion of corrosive media, the functions of hydraulic mac...

Claims

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Application Information

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IPC IPC(8): C23C4/10C23C4/12C22C29/02C23C4/06C23C4/129
CPCC22C29/08C23C4/06
Inventor 陈小明吴燕明周夏凉赵坚伏利毛鹏展程文韬马红海王莉容吴韬
Owner 水利部产品质量标准研究所
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