A kind of wear-resistant and corrosion-resistant cralsin composite coating and preparation method thereof

A composite coating and corrosion-resistant technology, which is applied in coatings, metal material coating processes, solid-state diffusion coatings, etc., can solve the problems of abnormal spalling, fatigue wear, low friction, long life and corrosion resistance of coatings, and easy Corrosion and peeling problems, to achieve good application prospects, prevent coating failure and peeling, and improve the effect of bearing and wear resistance

Active Publication Date: 2018-08-10
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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  • A kind of wear-resistant and corrosion-resistant cralsin composite coating and preparation method thereof
  • A kind of wear-resistant and corrosion-resistant cralsin composite coating and preparation method thereof
  • A kind of wear-resistant and corrosion-resistant cralsin composite coating and preparation method thereof

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Effect test

preparation example Construction

[0038] A preparation method of a wear-resistant and corrosion-resistant CrAlSiN composite coating, comprising the following steps:

[0039] Step 1. Cleaning, degreasing, and surface activation treatment on the surface of the substrate; the specific surface activation treatment is: place the substrate in the vacuum chamber of the coating equipment, preheat the substrate to 400°C~450°C after vacuuming, and use argon plasma to Activation by bombarding the surface of the substrate with a negative bias voltage applied; the specific process is: the vacuum chamber is evacuated to (3~6)×10 -3 Pa, preheat the substrate to 400°C~450°C, pass in the working argon gas of 100~350sccm, start the bias power supply, and bombard the substrate with a bias voltage of -900~-1200V for 10 minutes to activate the surface of the substrate;

[0040] Step 2. Place the substrate treated in step 1 in the vacuum chamber of the coating equipment, select Cr and AlSi targets, target current is 50~100A, apply ...

Embodiment 1

[0049] The ball valve made of 304 stainless steel is used as the substrate, including the following steps:

[0050] Step 1. Cleaning, degreasing, and surface activation treatment on the surface of the substrate; the specific surface activation treatment is: place the substrate in the vacuum chamber of the coating equipment, preheat the substrate to 400°C~450°C after vacuuming, and use argon plasma to Activation by bombardment on a negatively biased substrate surface;

[0051] Step 2. Place the substrate treated in step 1 in the vacuum chamber of the coating equipment, select Cr and AlSi targets, target current is 50~100A, apply negative bias voltage of -20~-50V to the workpiece, and control the heating temperature to 400°C At ~450°C, argon and nitrogen are introduced, and the composition of Cr layer, CrN layer and CrAlSiN layer is sequentially deposited on the surface of the substrate by controlling the flow rate of argon gas, nitrogen gas flow and deposition time, as follows:...

Embodiment 2

[0057] The butterfly valve made of 316 stainless steel is used as the substrate, including the following steps:

[0058] Step 1. Cleaning, degreasing, and surface activation treatment on the surface of the substrate; the specific surface activation treatment is: place the substrate in the vacuum chamber of the coating equipment, preheat the substrate to 400°C~450°C after vacuuming, and use argon plasma to Bombard the surface of the substrate with a negative bias to activate it; then perform ion nitriding treatment on the substrate: place the substrate in the vacuum chamber of the coating equipment, feed nitrogen with a flow rate of 1000~1200sccm, and control the working air pressure at 8~10Pa. -800~-1000V negative bias, temperature controlled at 450~500℃, nitriding treatment time is 2~4 hours;

[0059] Step 2. Place the substrate treated in step 1 in the vacuum chamber of the coating equipment, select Cr and AlSi targets, target current is 50~100A, apply negative bias voltage ...

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Abstract

The invention discloses a wear-resisting corrosion-resistant CrAlSiN composite coating. The wear-resisting corrosion-resistant CrAlSiN composite coating comprises a basal body, wherein a composite coating covers the basal body; and the composite coating consists of a Cr layer, a CrN layer and a CrAlSiN layer, which are stacked up and arranged sequentially from bottom to top on the surface of the basal body. A preparation method for the wear-resisting corrosion-resistant CrAlSiN composite coating comprises the following steps: step I, cleaning the surface of the basal body, carrying out oil removal on the surface of the basal body, and carrying out surface activation treatment on the surface of the basal body; step II, in a vacuum cavity of coating equipment, selecting Cr and an AlSi target, introducing argon gas and nitrogen gas into the vacuum cavity, and sequentially depositing the Cr layer, the CrN layer and the CrAlSiN layer on the surface of the basal body by controlling nitrogen gas flow, nitrogen gas flow and deposition time; and step III, after the deposition of the coating is completed, cooling to obtain the composite surface on the surface of the basal body. The composite coating disclosed by the invention is convenient to prepare, has coating gradient, can reduce residual stress, and has high wear resistance, high corrosion resistance and high contact fatigue resistance.

Description

technical field [0001] The invention relates to the technical field of surface strengthening treatment of mechanical parts, in particular to a wear-resistant and corrosion-resistant CrAlSiN composite coating and a preparation method thereof; the CrAlSiN composite coating is suitable for marine environments such as marine engineering equipment, offshore facilities, and ships middle. Background technique [0002] Moving parts in corrosive environments are widely used in petroleum, chemical and power station construction projects, such as 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. 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 have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/34C23C14/16C23C14/06C23C14/02C23C8/36
CPCC23C8/36C23C14/0036C23C14/02C23C14/0641C23C14/165C23C14/3464
Inventor 王永欣单磊刘孟奇王立平薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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