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Abrasion-resistant composite protective coating for hard sealing surface of ball valve and preparation method of abrasion-resistant composite protective coating

A protective coating and hard sealing technology, applied in the field of surface engineering, can solve the problems of poor wear resistance and short service life, and achieve the effect of prolonging service life, improving service performance and avoiding pitting corrosion.

Active Publication Date: 2020-06-02
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite protective coating in the prior art still has the problems of poor abrasion resistance and short service life.

Method used

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  • Abrasion-resistant composite protective coating for hard sealing surface of ball valve and preparation method of abrasion-resistant composite protective coating
  • Abrasion-resistant composite protective coating for hard sealing surface of ball valve and preparation method of abrasion-resistant composite protective coating
  • Abrasion-resistant composite protective coating for hard sealing surface of ball valve and preparation method of abrasion-resistant composite protective coating

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Effect test

preparation example Construction

[0046] The present invention also provides a method for preparing the anti-corrosion composite protective coating on the hard sealing surface of the ball valve described in the above technical solution, comprising the following steps:

[0047] Supersonic flame spraying is carried out on the surface of the metal substrate to obtain Cr 3 C 2 -NiCr coating;

[0048] With Cr target, WC target and C target as sputtering targets, in the Cr 3 C 2 -Closed-field unbalanced magnetron sputtering on the surface of the NiCr coating to obtain a Cr→Cr / C / WC dual-mode transition layer;

[0049] The C target and the WC target are used to carry out unbalanced magnetron sputtering deposition on the surface of the Cr→Cr / C / WC dual-mode transition layer to obtain a WC / a-C nanometer multilayer film.

[0050] The present invention carries out supersonic flame spraying on the surface of metal substrate, obtains Cr 3 C 2 -NiCr coating.

[0051] In the present invention, the oxygen flow rate of th...

Embodiment 1

[0061] An anti-corrosion composite protective coating on the hard sealing surface of a ball valve. The composite coating is made of Cr with a thickness of 240 μm on the metal substrate of 316L stainless steel. 3 C 2 -NiCr coating, based on Cr 3 C 2 -A Cr→Cr / C / WC dual-mode transition layer with a thickness of 300 nm on the NiCr coating and a WC / a-C nano-multilayer film with a thickness of 3.0 μm on the Cr→Cr / C / WC dual-mode transition layer 3 production.

[0062] Its preparation method comprises the following steps:

[0063] (1) After polishing the surface of 316L stainless steel, use acetone cleaning solution to ultrasonically clean for 20 minutes under the conditions of ultrasonic power of 500 W and temperature of 20°C to obtain a metal matrix.

[0064] (2) Spray a layer of Cr with a thickness of 240 μm on the surface of the metal substrate by supersonic flame spraying technology. 3 C 2 -NiCr coating.

[0065] Among them: the condition of supersonic flame spraying means...

Embodiment 2

[0079] An anti-corrosion composite protective coating on the hard sealing surface of a ball valve. The composite coating is composed of Cr with a thickness of 260 μm on the metal substrate of 316L stainless steel. 3 C 2 -NiCr coating, based on Cr 3 C 2 -A Cr→Cr / C / WC dual-mode transition layer with a thickness of 350 nm on the NiCr coating and a WC / a-C nano-multilayer film with a thickness of 4.0 μm on the Cr→Cr / C / WC dual-mode transition layer become.

[0080] Its preparation method comprises the following steps:

[0081] (1) After polishing the surface of 316L stainless steel, use acetone cleaning solution to ultrasonically clean it for 15 minutes under the conditions of ultrasonic power of 800 W and temperature of 30°C to obtain a metal matrix.

[0082] (2) Spray a layer of Cr with a thickness of 260 μm on the surface of the metal substrate by supersonic flame spraying technology. 3 C 2 -NiCr coating.

[0083] Among them: the condition of supersonic flame spraying mean...

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Abstract

The invention provides an abrasion-resistant composite protective coating for a hard sealing surface of a ball valve and a preparation method of the abrasion-resistant composite protective coating, and belongs to the field of surface engineering. The invention provides the abrasion-resistant composite protective coating for the hard sealing surface of the ball valve, a Cr3C2-NiCr coating, a Cr->Cr / C / WC dual-mode transition layer and a WC / a-C nano multilayer film are sequentially prepared on the surface of a metal matrix. According to the abrasion-resistant composite protective coating, the abrasion-resistant composite protective coating has a lower friction coefficient, ultralow internal stress, high bearing capacity and excellent abrasion resistance, is suitable for being used as an abrasion-resistant protective material for the hard sealing surface of the ball valve, and can remarkably improve the abrasion resistance and prolong the service life, so that the purposes of reducing thecost and improving the safety and reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to an anti-corrosion composite protective coating on a hard sealing surface of a ball valve and a preparation method thereof. Background technique [0002] The hard sealing surface of the ball valve is often used in harsh working conditions such as high temperature, abrasion, corrosion-abrasion, etc., thermal spraying Cr 3 C 2 -NiCr coating is widely used as hard sealing material for ball valves because of its excellent high temperature resistance, corrosion resistance and wear resistance. However, due to the high friction coefficient and large porosity of this type of coating, it is easy to bite and fall off during the opening / closing process of the ball valve, resulting in severe corrosion and wear, resulting in valve leakage, which seriously threatens production safety. [0003] In recent years, physical vapor deposition (PVD) technology has been gradually used in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/06C23C14/14C23C14/06C23C14/35C23C28/00
CPCC23C4/06C23C14/0605C23C14/0635C23C14/14C23C14/3407C23C14/3492C23C14/352C23C28/321C23C28/341C23C4/129
Inventor 何东青李文生汤鹏君武彦荣邱晓来翟海民成波
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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