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High-cavitation-resistance composite coating and preparation method thereof

A coating and cavitation technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of easy peeling of coating and deformation of workpiece, and achieve dense coating, high elastic limit and no cracks Effect

Inactive Publication Date: 2012-04-11
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the shortcomings of the prior art that the high temperature easily deforms the workpiece during the preparation of the coating with high bonding strength, and the mechanically bonded coating is easy to peel off, the present invention provides a composite coating with high cavitation resistance and its preparation method , the prepared composite coating is composed of amorphous, nanocrystalline and boride, which has high bonding strength and is not easy to peel off

Method used

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  • High-cavitation-resistance composite coating and preparation method thereof
  • High-cavitation-resistance composite coating and preparation method thereof
  • High-cavitation-resistance composite coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] According to the composition of each element by weight percentage, B≥6%, Si is 3-6%, Cr is 20-55%, Ni is 10-20%, Mo is 2-4%, and the rest is the proportion of Fe; , Si, Cr, Ni, Mo, Fe to prepare iron-based alloy powder;

[0024] Take iron-based alloy powder with a particle size of 10-70 μm, kerosene as fuel, oxygen as a combustion aid, place the cavitation sample on a copper seat, the oxygen flow rate is 800L / min, the kerosene flow rate is 20L / h, and the distance between the flame gun and the workpiece is 400mm , Argon is the powder feeding gas, the flow rate is 12L / min, the powder feeding volume is 6.0rpm, and the moving speed of the spray gun is 380mm / s. After ignition, the powder is ejected from the flame gun and deposited directly onto the surface of the workpiece to form a composite coating. The thickness of the coating is 320μm, the microhardness is 950HV, the coating is composed of amorphous, nanocrystalline and boride, and its cavitation resistance is 4.5 times...

Embodiment 2

[0026] According to the composition of each element by weight percentage, B is 8%, Si is 3%, Cr is 25%, Ni is 20%, Mo is 4%, and the rest is the proportion of Fe; B, Si, Cr, Ni, Mo, Fe alloy preparation metal powder;

[0027] Take iron-based alloy powder with a particle size of 10-70 μm, use kerosene as fuel, and oxygen as a combustion aid, place the cavitation sample on a copper seat, and add an argon jet for cooling. The distance between the gun and the workpiece is 450mm, the argon gas is the powder feeding gas, the flow rate is 10L / min, the powder feeding amount is 8rpm, and the moving speed of the spray gun is 450mm / s. After ignition, the powder is ejected from the gun and deposited directly onto the surface of the cavitation sample, forming a coating. The thickness of the coating is 350μm, the microhardness is 1100HV, the coating is composed of amorphous, nanocrystalline and boride, and its cavitation resistance is 5.5 times that of ZG06Cr13Ni5Mo martensitic stainless s...

Embodiment 3

[0029] According to the composition of each element by weight percentage, B is 10%, Si is 4%, Cr is 33%, Ni is 16%, Mo is 3.2%, and the rest is the proportion of Fe; B, Si, Cr, Ni, Mo , Fe alloy preparation metal powder;

[0030] Take iron-based alloy powder with a particle size of 10-70 μm, kerosene as fuel, oxygen as a combustion aid, place the cavitation sample on a copper seat, and add nitrogen injection for cooling, oxygen flow rate 950L / min, kerosene flow rate 28L / h, flame gun The distance from the workpiece is 450mm, the argon gas is the powder feeding gas, the flow rate is 10L / min, the powder feeding amount is 8rpm, and the moving speed of the spray gun is 450mm / s. After ignition, the powder is ejected from the gun and deposited directly onto the surface of the cavitation sample, forming a coating. The thickness of the coating is 400μm, the microhardness is 1150HV, the coating is composed of amorphous, nanocrystalline and boride, and its cavitation resistance is 6.5 t...

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Abstract

The invention discloses a high-cavitation-resistance composite coating. The composite coating consists of amorphous substances, nano-crystalline substances and borides, wherein the composition in percentage by weight of elements is: more than or equal to 6 percent of B, 3 to 6 percent of Si, 20 to 55 percent of Cr, 10 to 20 percent of Ni, 2 to 4 percent of Mo, and the balance of Fe; the thicknessof the composite coating is 100 to 400 mu m; and the amorphous substances and the nano-crystalline substances in the composite coating account for 40 to 80 percent of the volume of the composite coating. A preparation method comprises: directly spraying and depositing alloy powder melted by high-speed flame onto a substrate material; simultaneously supplying cooling gas to a deposition surface and / or placing a workpiece needing deposition on a copper-base pedestal; and synchronously preparing the composite coating containing not only the amorphous substances and the nano-crystalline substances but also the borides. The composite coating has high hardness and high wear resistance, and in particular, the formation of the nano-crystalline substances needs no subsequent annealing treatment.

Description

1. Technical field [0001] The invention relates to a surface coating of a water conservancy machinery flow-passing part and a preparation method thereof, in particular to a composite coating with high cavitation resistance composed of amorphous, nanocrystal and boride and a preparation method thereof. 2. Background technology [0002] Water turbines, water pumps and other hydraulic machinery flow components are often subject to severe cavitation, abrasion, and erosion during operation, among which cavitation damage is the most serious. Cavitation is the result of the combined effects of fatigue damage and corrosion of materials under the action of fluid. Although people have recognized cavitation for more than one hundred years, the problem of cavitation has not been well solved due to the complexity of cavitation itself and the diversity of influencing factors. Taking the water pump as an example, a major problem that plagues the normal operation of the water pump is the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C30/00C23C4/06C23C4/12C23C4/129
Inventor 吴玉萍张太超彭竹琴
Owner HOHAI UNIV