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Nanometer multi-layer piston ring coating and preparation method and application thereof

A nano-multi-layer, piston ring technology, applied in the coating, metal material coating process, superimposed layer plating, etc., can solve the problems of high stress, restricted application, low bonding force of CrCN coating, etc., and achieve high hardness , low cost, high binding effect

Active Publication Date: 2018-05-25
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 low binding force and high stress of the CrCN coating after doping with C elements restrict the application of the coating to parts such as engine piston rings.

Method used

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  • Nanometer multi-layer piston ring coating and preparation method and application thereof
  • Nanometer multi-layer piston ring coating and preparation method and application thereof
  • Nanometer multi-layer piston ring coating and preparation method and application thereof

Examples

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Comparison scheme
Effect test

preparation example Construction

[0042] Further, the preparation method includes: placing the base material of the piston ring in the vacuum chamber of the coating equipment, and sequentially depositing a metal Cr transition layer and a CrCN / Cr nanometer multilayer on the base material of the piston ring by using multi-arc ion plating technology coating, until the formation of the nano-multilayer piston ring coating.

[0043] In some embodiments, the process conditions adopted by the multi-arc ion plating technology include: a Cr target, a target current of 50A to 100A, a bias voltage of -20A to -100A, a temperature of 350°C to 450°C, and working gases including argon, Nitrogen and hydrocarbon gases.

[0044] More preferably, the conditions for depositing and forming the metal Cr transition layer include: argon gas flow rate 100 sccm-400 sccm, nitrogen gas flow rate 0 sccm, hydrocarbon gas flow rate 0 sccm, deposition time 5 min-50 min.

[0045] More preferably, the conditions for depositing and forming the ...

Embodiment 1

[0067] Embodiment 1: the nanometer multilayer piston ring CrCN / Cr coating (also known as nanometer multilayer piston ring coating) of the present embodiment is formed on the metal Cr transition layer on the piston ring parent material and is formed on the metal Cr transition layer The CrCN / Cr layer multilayer structure coating composition. The thickness of the metal Cr transition layer is about 1.3 μm. The total thickness of the CrCN / Cr layer multilayer structure coating is about 10.9 μm.

[0068] The nanometer multilayer piston ring CrCN / Cr coating can be prepared according to the following steps:

[0069] (1) Clean, degrease, and surface activate the base metal of the piston ring. First, use ethanol, acetone and other solvents to clean and degrease the base metal of the piston ring, and then put it into the vacuum chamber of the multi-arc ion plating equipment for argon plasma activation treatment. The flow rate of argon gas is 120 sccm, and the bias voltage is - 1000V, t...

Embodiment 2

[0088] Embodiment 2: the nanometer multilayer piston ring CrCN / Cr coating (also known as nanometer multilayer piston ring coating) of the present embodiment is formed on the metal Cr transition layer on the piston ring parent material and is formed on the metal Cr transition layer The CrCN / Cr layer multilayer structure coating composition. The thickness of the metal Cr transition layer is about 1.3 μm. The thickness of the CrCN / Cr multilayer structure coating is about 11.8 μm. Tests show that the bonding force between the CrCN / Cr coating and the base material of the piston ring is about 76.8N, the hardness is about 28.4Gpa, and the oil lubrication friction coefficient is about 0.091.

[0089] The nanometer multilayer piston ring CrCN / Cr coating can be prepared according to the following steps:

[0090] (1) Clean, degrease, and surface activate the base metal of the piston ring. First, use ethanol, acetone and other solvents to clean and degrease the base metal of the piston...

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Abstract

The invention discloses a nanometer multi-layer piston ring CrCN / Cr coating and a preparation method and application of the nanometer multi-layer piston ring CrCN / Cr coating. The nanometer multi-layerpiston ring coating is formed on piston ring base metal and comprises a metal Cr transition layer and a CrCN / Cr nanometer multi-layer coating. The CrCN / Cr nanometer multi-layer coating comprises a CrCN layer and a Cr layer which are alternately overlaid. The preparation method comprises the steps that in film plating equipment, a multi-arc ion plating technology is adopted for depositing the metal Cr transition layer and the CrCN / Cr nanometer multi-layer coating on the piston ring base metal in sequence, and the nanometer multi-layer piston ring coating is formed. The nanometer multi-layer piston ring CrCN / Cr coating has the advantages of being high in hardness, high in binding force, high in wear resistance, low in friction coefficient and the like, and the preparation method is simple and easy to implement, high in controllability, low in cost, capable of producing piston ring coatings with integrated toughness and lubrication and good in application prospect.

Description

technical field [0001] The invention relates to a CrCN / Cr nanocomposite coating for a piston ring and a preparation method thereof, belonging to the technical field of material surface treatment. Background technique [0002] CrN coating has been widely used in cutting tools, molds, engines and other fields due to its high hardness and high wear resistance. CrN-coated piston rings have excellent wear resistance and fusion resistance. For example, the wear resistance and anti-tension performance of "Riken's CrN coated piston rings" are superior to chrome-plated piston rings and nitrided rings. At the same time, CrN-coated ceramic piston rings can save fuel by 3% to 8%, reduce cylinder liner wear by 1 / 3 to 1 / 2, increase thermal conductivity by 45%, and reduce exhaust emissions by 40% to 60%. consumption advantage. However, due to problems such as cracks or gaps in the hard CrN piston ring and the peeling of the coating caused by it, the piston ring cannot give full play to i...

Claims

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Application Information

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IPC IPC(8): C23C28/02
CPCC23C28/027C23C28/40
Inventor 刘二勇薛原蒲吉斌王永欣王立平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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