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A dual-process composite coating for metal valves and pipe fittings

A technology of composite coating and composite coating, applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problem of unsatisfactory life, corrosion resistance and wear resistance of coated metal valves and pipe fittings It can solve the problems of poor comprehensive performance and damage origin, so as to achieve excellent resistance to erosion and wear of liquid and hard particles, durable wear resistance and corrosion resistance, and large thickness.

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

However, there are structural defects such as holes, cracks, and inclusions in thermal sprayed coatings, which are very sensitive to liquid media and often become the origin of damage.
Due to the low density of existing coatings, many structural defects, and poor comprehensive performance of corrosion resistance and wear resistance, the service life of coated metal valves and pipe fittings is still unsatisfactory.

Method used

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  • A dual-process composite coating for metal valves and pipe fittings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The composite coating is composed of inner and outer layers. The inner layer is an extra-coarse-grained tungsten carbide-based coating with a particle size of 143 μm. The inner tungsten carbide-based coating is made of plasma spraying. The hard phase of the tungsten carbide-based coating is WC and W 2 C, WC and W 2 The overall fraction of the C hard phase is 42%, and the tungsten carbide-based coating also has submicron Cr with a volume fraction of 23% 7 C 3 and Cr 23 C 6 Dispersion strengthening phase, the binder phase of the tungsten carbide-based coating is a nickel alloy containing 82% Ni by mass fraction, and the phase of the nickel alloy binder phase is FeNi 3 , CrSi 2 and Cr 3 Si, the thickness of the inner layer of tungsten carbide-based coating is 0.61mm, and the outer layer is a non-columnar structure and dense titanium nitride ceramic coating composed of metal elements titanium and nitrogen elements. The titanium nitride ceramic coating is deposited by ...

Embodiment 2

[0014] The composite coating is composed of inner and outer layers. The inner layer is an extra-coarse-grained tungsten carbide-based coating with a particle size of 90 μm. The inner layer of the tungsten carbide-based coating is made of supersonic flame spraying. Phases are WC and W 2 C, WC and W 2 The overall fraction of the C hard phase is 57%, and the tungsten carbide-based coating also has submicron Cr with a volume fraction of 18% 7 C 3 and Cr 23 C 6 Dispersion strengthening phase, the binder phase of the tungsten carbide-based coating is a nickel alloy containing 76% Ni by mass fraction, and the phase of the nickel alloy binder phase is FeNi 3 , CrSi 2 and Cr 3 Si, the thickness of the inner tungsten carbide-based coating is 0.5mm, and the outer layer is a non-columnar structure and dense titanium-aluminum nitride ceramic coating composed of metal elements titanium, aluminum and nitrogen elements. The titanium-aluminum nitride ceramic coating is composed of It is...

Embodiment 3

[0016] The composite coating is composed of inner and outer layers. The inner layer is an extra-coarse-grained tungsten carbide-based coating with a particle size of 125 μm. The inner tungsten carbide-based coating is made of plasma spray welding. for WC and W 2 C, WC and W 2 The overall fraction of the C hard phase is 48%, and the tungsten carbide-based coating also has submicron Cr with a volume fraction of 21% 7 C 3 and Cr 23 C 6 Dispersion strengthening phase, the binder phase of the tungsten carbide-based coating is a nickel alloy containing 86% Ni by mass fraction, and the phase of the nickel alloy binder phase is FeNi 3 , CrSi 2 and Cr 3 Si, the thickness of the inner layer of tungsten carbide-based coating is 0.7mm, and the outer layer is a non-columnar structure and dense chromium-aluminum nitride ceramic coating composed of metal elements chromium, aluminum and nitrogen elements. The chromium-aluminum nitride ceramic coating is composed of It is made by a phas...

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Abstract

The invention discloses a double-process composite coating for metal valves and pipe fittings, and relates to the technical field of surface coatings. The dual-process composite coating is prepared by thermal spraying and physical vapor deposition. The inner layer is a tungsten carbide-based coating, and the outer layer is a nitride ceramic layer. After vacuum heat treatment and pulse electromagnetic field treatment, the coating structure is very dense. There are no structural defects such as holes and cracks in the coating, and the coating is firmly combined with the valve and pipe fitting substrate. The dual-process composite coating of the invention has high surface hardness, high corrosion potential, low corrosion current density, excellent anti-wear and anti-corrosion effects, and can meet the use requirements of harsh and complicated working conditions.

Description

technical field [0001] The invention belongs to the technical field of surface coatings, in particular to a dual-process composite coating for metal valves and pipe fittings. Background technique [0002] Valves and pipe fittings used in oil and gas exploration and transportation, chemical industry, sewage treatment and other fields are subjected to fluid corrosion and erosion wear of hard particles in the fluid during service. The most commonly used carbon steel, low alloy steel and stainless steel for valves and pipe fittings are made , cast iron and other metal materials are difficult to be compatible with corrosion resistance and wear resistance, resulting in a very short service life of metal valves and pipe fittings of these materials, which not only causes huge pressure on maintenance, but also poses a greater safety hazard. The use of thermal spraying method to prepare a layer of hard protective coating on the surface of metal valves and pipe fittings can enhance the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C4/134C23C4/129C23C4/06C23C4/16C22C29/08C23C14/06C23C14/02C23C14/58C23C4/18
CPCC23C28/34C23C4/134C23C4/129C23C4/06C23C4/16C22C29/08C22C29/067C23C14/0641C23C14/0617C23C14/022C23C14/5806C23C14/58C21D10/00
Inventor 鲜广赵海波鲜丽君范洪远熊计郭智兴王均
Owner SICHUAN UNIV