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Corrosion-resistant and wear-resistant coating with laminated and columnar composite structure and preparation method thereof

A composite structure and wear-resistant coating technology, which is applied in the direction of coating, superimposed layer plating, metal material coating technology, etc., can solve problems that have not been reported at home and abroad, and achieve improved impact resistance and heat resistance Seismic and other performance, improve efficiency, reduce the effect of porosity

Active Publication Date: 2020-09-22
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there have not been reports at home and abroad for ultra-thick, strong metallurgical bonding wear-resistant and corrosion-resistant coatings and preparation methods

Method used

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  • Corrosion-resistant and wear-resistant coating with laminated and columnar composite structure and preparation method thereof
  • Corrosion-resistant and wear-resistant coating with laminated and columnar composite structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Powder Preparation

[0039] The wear-resistant and corrosion-resistant coating raw materials are divided into alloy powder with a particle size of 45-75 μm and ceramic powder with a particle size of 35-45 μm. The spray layer is composed of 30wt% alloy powder and 70wt% ceramic powder. The proportion of ceramic powder is: 45wt% WC, 25wt% B 4 C, 10wt% SiC, the rest is mixed powder TiO 2 :ZrO 2 :Cr 2 o 3 :Al 2 o 3 = 1:1:1:1 (molar ratio) powder; the ratio of alloy powder in the sprayed layer and the alloy layer is: mixed powder Ni:Cr=1:1 accounts for 90wt%, mixed powder Ti:Al =1:1 accounts for 5wt%, the rest is mixed powder Co:Cu:Si=1:1:1 (molar ratio);

[0040] Step 2: Substrate surface pretreatment

[0041] First, the workpiece 2 is soaked in acid solution, the soaking time is determined according to the degree of dirt on the workpiece, and rinsed with water after acid leaching. Then soak it in alkaline water to neutralize the residual acid, and finally w...

Embodiment 2

[0049] Step 1: Powder Preparation

[0050] Wherein the spray layer 6 is formed by mixing 5wt% alloy powder and 95wt% ceramic powder, and the ceramic powder proportioning in the spray layer 6 is: 90wt% WC, 2wt% B 4 C, 1wt% SiC, the rest is mixed powder TiO 2 :ZrO 2 :Cr 2 o 3 :Al 2 o 3 = 1:1:1:1 (molar ratio) powder; the ratio of alloy powder in spray layer 6 and alloy layer 5 is: mixed powder Ni:Cr=1:1 accounts for 45wt%, mixed powder Ti : Al=1:1 accounts for 45wt%, the rest is mixed powder Co:Cu:Si=1:1:1 (molar ratio);

[0051] Step 3: Plasma Spraying

[0052] The spraying distance is 50mm, the powder feeding rate is 30g / min, the thickness of the alloy layer is 0.2mm, and the average microhardness is 380HV 0.3 ;

[0053] Step 4: Plasma Spraying

[0054] The mixed powder of alloy powder and ceramic powder, the proportion is: alloy powder 5%, ceramic powder 95%, the thickness is 1.2mm, and the average hardness reaches 1140HV 0.3 , a spray layer with a columnar structu...

Embodiment 3

[0058] Step 1: Powder Preparation

[0059] Wherein the spray layer 6 is formed by mixing 20wt% alloy powder and 80wt% ceramic powder, and the ceramic powder proportioning in the spray layer 6 is: 70% WC, 15% B 4 C, 5% SiC, the rest is mixed powder TiO 2 :ZrO 2 :Cr 2 o 3 :Al 2 o 3 = 1:1:1:1 (molar ratio) powder; the ratio of alloy powder in spray layer 6 and alloy layer 5 is: mixed powder Ni:Cr=1:1 accounts for 5wt%, mixed powder Ti : Al=1:1 accounts for 90wt%, the rest is mixed powder Co:Cu:Si=1:1:1 (molar ratio);

[0060] Step 3: Plasma Spraying

[0061] The spraying distance is 70mm, the powder feeding rate is 40g / min, the thickness of the alloy layer is 0.25mm, and the average microhardness is 330HV 0.3 ;

[0062] Step 4: Plasma Spraying

[0063] The thickness of the spray layer is 1.2mm, and the average hardness is 1070HV 0.3 , with a columnar structure spray layer and a layered alloy layer at the bottom, with a total thickness of 1.45mm.

[0064] Except for th...

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Abstract

The present invention discloses a layer -like and column -shaped composite structure of corrosion -resistant coating and preparation methods. It is a alloy layer on the surface of the pre -processing substrate to spray alloy powder through the low -pressure plasma spraying method.Preheat the surface of the alloy layer on the surface of the alloy alloy layer to obtain a composite melting layer of the columnar structure through the plasma melting technology melting alloy powder and ceramic powder mixed powder, and the cycle is re -to obtain until the multi -layer layer and column that continuously changes along the thick direction performance alternately alternately alternately alternatelyGradient structure.The present invention not only improves the binding force and corrosion resistance of the coating and the matrix; it can also obtain a multi -layer and column intercess of the multi -layer and column alternative gradient structure that continuously changes along the thick direction, and improve the impact performance of the coating material.

Description

technical field [0001] The invention relates to a wear-resistant and corrosion-resistant coating material structure and preparation technology, belonging to the field of metal material surface treatment. Specifically, it discloses a method of combining plasma spraying and plasma spraying to efficiently obtain coating materials and methods with lamellar and columnar composite structures, while ensuring surface corrosion resistance and improving wear resistance. It can also obtain a multi-layer gradient structure with continuously changing properties along the thickness direction, improving the impact resistance of impact-resistant coating materials. Background technique [0002] Various gate valves in my country's marine engineering machinery, coal chemical industry, and petroleum industry, various sand pumps, slurry pumps, water turbines, and conveying pipelines in mines and cement industries work in complex and severe wear and corrosion environments. Because the protective ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/134C23C24/10C23C28/02
CPCC23C4/06C23C4/134C23C24/103C23C28/021C23C28/027
Inventor 崔洪芝王明亮宋晓杰王灿明宋强赵玉桥赵永
Owner SHANDONG UNIV OF SCI & TECH
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