Ultra-thick CrSiBN composite coating on surface of base body and preparation method thereof

A composite coating and substrate technology, applied in coatings, chemical instruments and methods, metal material coating technology, etc., can solve the problems of CrN coating corrosion and peeling, high friction and wear of CrN coating, fatigue wear, etc., to achieve reduction Small residual stress, high wear resistance, effect of improving hardness and wear resistance

Active Publication Date: 2015-03-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Application Information

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Problems solved by technology

[0007] The technical purpose of the present invention is to provide a super-thick CrSiBN composite coating on the surface of the substrate for the above-mentioned deficiency of the CrN coating on the surface of the substrate. The composite coating has high hardness, high wear resistance, high thermal stability, high corrosion resistance and Contact fatigue characteristics, which can solve the high friction and wear of CrN coating on the surface of existing high-load and high-heat-load engine piston rings (especially heavy-duty diesel engines), as well as the surface of large-size gears in disc polishing equipment. CrN coating is prone to corrosion, peeling off and fatigue wear

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  • Ultra-thick CrSiBN composite coating on surface of base body and preparation method thereof

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Embodiment 1

[0034] In this embodiment, the base part is a diesel engine ductile iron piston ring, and the surface of the base is coated with an ultra-thick CrSiBN composite coating. The 2 μm thick CrN supporting layer on the surface of the transition layer, and the 20 μm thick CrSiBN anti-wear and lubricating layer on the surface of the CrN supporting layer. Among them, the Si content in the CrSiBN anti-wear lubricating layer is 4%, and the B content is 8%.

[0035] The preparation method of the ultra-thick CrSiBN composite coating on the surface of the above-mentioned substrate comprises the following steps:

[0036] 1. Spherical graphite cast iron piston rings were ultrasonically cleaned in acetone solution for 20 minutes, air-dried, then transferred to a mixed solution of sodium carbonate 30g / L and sodium phosphate 50g / L, treated at 60°C for 5 minutes, warm water ultrasonically cleaned, and nitrogen air-dried ;

[0037] 2. The integrated equipment of straight tube magnetic filter multi...

Embodiment 2

[0044] In this embodiment, the base part is a large-sized 304 stainless steel gear in the disc polishing equipment, and the surface of the base is coated with an ultra-thick CrSiBN composite coating, and the ultra-thick CrSiBN composite coating is transitioned from a 0.5 μm thick Cr layer on the surface of the base. layer, a 2 μm thick CrN support layer on the surface of the Cr transition layer, and a 20 μm thick CrSiBN anti-wear lubrication layer on the surface of the CrN support layer. Among them, the Si content in the CrSiBN anti-wear lubricating layer is 8%, and the B content is 3%.

[0045] The preparation method of the ultra-thick CrSiBN composite coating on the surface of the above-mentioned substrate comprises the following steps:

[0046] 1. Ultrasonic clean the medium and large size 304 stainless steel gears of the disc polishing equipment in acetone solution for 20 minutes. Ultrasonic cleaning and nitrogen air drying;

[0047] 2. The integrated equipment of straig...

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Abstract

The invention provides an ultra-thick CrSiBN composite coating on surface of a base body and a preparation method of the ultra-thick CrSiBN composite coating by using magnetic filtering multi-arc ion plating and magnetron sputtering integrated device. The ultra-thick CrSiBN composite coating is composed of a Cr transition layer, a CrN supporting layer and a CrSiBN anti-wear lubricating layer orderly coated on the surface of a free base body; the Si content in the CrSiBN anti-wear lubricating layer is 0.5-30%, and B content is 0.5-20%. Compared with the existing CrN coating on the surface of the base body, the thickness of the composite coating can be up to 20-40 microns, and the ultra-thick CrSiBN composite coating has the characteristics of being high in hardness, high in durability, high in thermal stability, high in corrosion resistance and high in anti-fatigue character, has strengthening and corrosive protection roles on the base bodies such as a high-load and high-heat load engine piston ring, and a large-size gear in a disk polishing device, and has good application value.

Description

technical field [0001] The invention relates to the technical field of substrate surface strengthening treatment, in particular to a CrSiBN composite coating on the surface of a substrate and a preparation method thereof. Background technique [0002] The surface of many mechanical parts and other substrates needs to be enhanced with high hardness, wear resistance, high temperature resistance, corrosion resistance and contact fatigue resistance. [0003] For example, the piston ring is the key component with the most severe service conditions in the engine, and its wear resistance and lubricity directly affect the fuel efficiency, fuel consumption and service life of the internal combustion engine. The most severely worn part of the piston ring-cylinder liner friction pair is the top dead center area, and its friction conditions involve oil lubrication-high temperature oil lubrication-lean oil lubrication-no oil lubrication, especially the first piston ring often Operates i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04B32B15/00C23C14/32C23C14/35C23C14/06C23C14/14
Inventor 王立平蒲吉斌张广安王永欣薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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