Composite coating on the surface of a valve seal and its preparation method

A valve sealing, composite coating technology, applied in the direction of coating, chemical instruments and methods, metal material coating process, etc., can solve low friction, long life and corrosion resistance, abnormal coating peeling fatigue wear, coating The problems of large layer brittleness and other problems can prevent coating failure and peeling, the preparation method is simple and feasible, and the corrosion resistance performance is improved.

Active Publication Date: 2016-03-30
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional CrN coating with columnar crystal structure is easy to corrode and fall off in corrosive medium, and the coating is brittle. Initiation of cracks, leading to early abnormal spalling of the coating and accelerated fatigue wear failure
Therefore, the traditional single CrN coating has been difficult to adapt to the harsh service environment and performance requirements of valve seals in the current and future high mechanical load and corrosion environment, such as low friction under heavy load, long life and corrosion resistance, etc.

Method used

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  • Composite coating on the surface of a valve seal and its preparation method
  • Composite coating on the surface of a valve seal and its preparation method
  • Composite coating on the surface of a valve seal and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In this embodiment, the base body is a valve 304 stainless steel sphere or a butterfly valve 316 stainless steel disc. Clean and degrease multiple substrate samples, and then use multi-arc ion plating technology to deposit coatings on the surface of each substrate respectively. During the deposition process of each sample, the ion plating uses Cr targets, and the current of the Cr targets is kept at 50 ~100A, negative bias voltage of -20~-50V is applied on the substrate, and the heating temperature is controlled to be kept at 400℃~450℃ during the deposition process. The specific deposition conditions of different samples are as follows.

[0036] (1) Sample 1: The argon gas flow rate was maintained at 100 sccm, the nitrogen gas flow rate was 25 sccm, and the deposition time was 4 hours to obtain coating 1;

[0037] The cross-sectional appearance of the coating 1 is as follows: figure 2 As shown, it can be seen that the planar thickness of the coating is about 3.3um, an...

Embodiment 2

[0052] In this embodiment, the base part is a valve 304 stainless steel sphere, and the composite coating on the base surface is composed of Cr layers stacked on the base surface from bottom to top, composed of Cr and Cr 2 Cr / Cr formed by N mixing 2 N layer, Cr 2 N layer, made of Cr 2 Cr mixed with N and CrN 2 N / CrN layer, and CrN layer. Wherein, the thickness of the composite coating is 30 μm˜50 μm. Among them, the thickness of Cr layer is 0.3um~1um; Cr / Cr 2 The thickness of N layer is 5um~10um; Cr 2 The thickness of the N / CrN layer is , and the thickness of the CrN layer is 5um˜8um.

[0053] Using ion nitriding technology and multi-arc ion plating technology to prepare the above composite coating, the specific preparation process is as follows:

[0054] 1. Sandblasting the 304 stainless steel sphere, the process parameters of the sandblasting treatment are: pressure 0.3MPa, sand particle size 320#, sandblasting distance 100mm; then, ultrasonically clean the 304 stainl...

Embodiment 3

[0070] In this embodiment, the base part is a butterfly valve 316 stainless steel plate, and the composite coating on the surface of the base is composed of Cr layers stacked on the surface of the base from bottom to top, composed of Cr and Cr 2 Cr / Cr formed by N mixing 2 N layer, Cr 2 N layer, made of Cr 2 Cr mixed with N and CrN 2 N / CrN layer, and CrN layer. Wherein, the thickness of the composite coating is 30 μm˜50 μm. Among them, the thickness of Cr layer is 0.3um~1um; Cr / Cr 2 The thickness of N layer is 5um~10um; Cr 2 The thickness of the N / CrN layer is , and the thickness of the CrN layer is 5um˜8um.

[0071] Adopt ion nitriding technology and multi-arc ion plating technology to prepare above-mentioned composite coating, step 1 and step 2 in the specific preparation process are respectively identical with step 1 and step 2 in embodiment 2, and step 3 and step 4 are as follows:

[0072] 3. Introduce argon gas and high-purity nitrogen gas (99.95% purity) to deposit...

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Abstract

The invention provides a composite coating on the surface of a valve sealing piece. The coating takes the valve sealing piece as a base body and consists of a Cr layer, a Cr / Cr2N layer formed by mixing Cr and Cr2N, a Cr2N layer, a Cr2N / CrN layer formed by mixing the Cr2N and CrN, and a CrN layer. Compared with an existing CrN coating with a single structure, the composite coating with multiple layers of gradients has the advantages that the bearing and anti-abrasion capability and the corrosion resistance are improved. Furthermore, the composite coating is prepared by a multi-arc ion plating technology, and the respective layers are obtained by sequentially performing deposition on the surface of the base body by controlling the argon flow, the nitrogen flow and the deposition time; the preparation method is simple and feasible; batch production can be realized; the composite coating has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of surface strengthening treatment of mechanical parts, and in particular relates to a composite coating on the surface of a valve seal and a preparation method thereof. Background technique [0002] Valves are widely used in petroleum, chemical and power station construction projects. Valve seals are an important part of valves. In practical applications, the valve seals are required to have a long service life, at least to ensure that the valve will not be damaged within a maintenance period (generally 1 to 2 years), so as to ensure the safe and normal operation of the entire system. For example, the valve seals used in nuclear power plants have higher requirements and must ensure safe operation for more than 30 years; some special parts of petrochemical pipelines also have high requirements for valve seals, which must ensure more than 100,000 safety switches. [0003] In addition, during the use of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/00B32B9/04C23C14/32C23C14/06C23C8/36
Inventor 王永欣单磊李金龙陈建敏
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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