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A kind of preparation method of anti-erosion wear fluid valve parts

An anti-erosion and fluid technology, applied in the field of valve manufacturing, can solve the problems of limited erosion and wear resistance, and achieve the effects of enhanced hardness and wear resistance, excellent corrosion resistance, interface fusion and increased strength

Active Publication Date: 2022-06-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the corrosion resistance of valves prepared by existing methods, especially the erosion and wear resistance is still limited.

Method used

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  • A kind of preparation method of anti-erosion wear fluid valve parts

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Experimental program
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Effect test

Embodiment 1

[0013] The valve seat is formed by the casting method, and then a layer of tungsten carbide-based coating is sprayed on the inner wall surface of the valve seat by the atmospheric plasma spraying process. 2 C and submicron Cr 7 C 3 , Cr 23 C 6 The WC and W in the coating are uniformly distributed in the nickel-based binder phase 2 The overall fraction of the C hard phase is 45.4%, and the Cr in the coating 7 C 3 and Cr 23 C 6 The overall fraction of the dispersion strengthened phase is 16.2%, the mass fraction of Ni in the nickel-based binder phase is 83.6%, the rest are Cr, Fe and Si, and the phase of the nickel-based binder phase is FeNi 3 , CrSi 2 and Cr 3 Si, the thickness of the tungsten carbide-based coating is 0.65mm; after the surface is smoothed, the phase vapor deposition method is used to continue to deposit a nitride ceramic layer on the surface of the tungsten carbide-based coating, and the process is that the vacuum is 2.0×10 -3 At Pa, argon gas was int...

Embodiment 2

[0016] A sphere is formed by a forging method, and then a tungsten carbide-based coating is sprayed on the surface of the sphere by a supersonic flame spraying process. The tungsten carbide-based coating is composed of coarse-grained WC, W 2 C and submicron Cr 7 C 3 , Cr 23 C 6 The WC and W in the coating are uniformly distributed in the nickel-based binder phase 2 The overall fraction of the C hard phase is 58.9%, and the Cr in the coating 7 C 3 and Cr 23 C 6 The overall fraction of the dispersion strengthened phase is 24.7%, the mass fraction of Ni in the nickel-based binder phase is 81.8%, the rest are Cr, Fe and Si, and the phase of the nickel-based binder phase is FeNi 3 , CrSi 2 and Cr 3 Si, the thickness of the tungsten carbide-based coating is 0.83mm; after the surface is smoothed, the phase vapor deposition method is used to continue to deposit a nitride ceramic layer on the surface of the tungsten carbide-based coating. The process is that the vacuum is 4.0×...

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Abstract

The invention discloses a method for preparing a fluid valve part resistant to erosion and wear. The method is to prepare a layer of tungsten carbide-based coating and a nitride coating on the surface of a casting or forging fluid valve part by thermal spraying and physical vapor deposition. The ceramic layer is then vacuum heat treated and pulsed electromagnetic field post-treated to eliminate structural defects such as holes in the coating, reduce residual stress, and enhance the bonding between the coating and the substrate, the outer coating and the inner coating. The method of the invention is simple to operate and easy to implement, and the obtained double-process double-layer composite coating fluid valve part has both anti-wear and anti-corrosion functions, and has a long service life under the erosion condition of sand-containing liquid.

Description

technical field [0001] The invention belongs to the technical field of valve manufacturing, and in particular relates to a method for preparing fluid valve parts with resistance to erosion and wear. Background technique [0002] Corrosion and wear failure are one of the key problems faced by valves and pipelines in the fields of oil and gas extraction and transportation, chemical industry, sewage treatment, etc. Even valve parts made of martensitic stainless steel have relatively limited service life. In order to improve the wear resistance and corrosion resistance of fluid valves, surface nitriding, chrome plating, surfacing, thermal spraying and other methods are usually used to prepare a layer of wear-resistant and anti-corrosion coatings on the surface of valve parts. Among them, thermal spraying technology is widely used due to the advantages of flexible process, convenient operation, variety of spraying materials, and high production efficiency. Compared with ordinary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C4/134C23C4/129C23C4/06C22C29/08C23C4/18C23C14/02C23C14/06C23C14/58
CPCC23C28/34C23C4/134C23C4/129C23C4/06C22C29/08C22C29/067C23C4/18C23C14/022C23C14/0641C23C14/5806C23C14/58C21D10/00
Inventor 鲜广赵海波鲜丽君范洪远熊计王均郭智兴
Owner SICHUAN UNIV