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Fuel-saving type Cr-O-N nanocrystalline composite ceramic coated piston ring of diesel engine and preparation method thereof

A diesel engine, nanocrystalline composite technology, applied in piston rings, engine components, machines/engines, etc., can solve the problems of wear resistance and oil storage performance that need to be further improved, and achieve improved service life, high efficiency, and fine structure. while the dense effect

Inactive Publication Date: 2013-08-21
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its wear resistance and oil storage performance need to be further improved

Method used

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  • Fuel-saving type Cr-O-N nanocrystalline composite ceramic coated piston ring of diesel engine and preparation method thereof
  • Fuel-saving type Cr-O-N nanocrystalline composite ceramic coated piston ring of diesel engine and preparation method thereof
  • Fuel-saving type Cr-O-N nanocrystalline composite ceramic coated piston ring of diesel engine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Under the condition of 200 ℃ and argon gas, the piston ring was glow cleaned; after the end, the transition metal Cr bonding layer was deposited under the conditions of pressure 0.01Pa and bias voltage -800V, and the thickness of the Cr bonding layer was 20 nanometers; Nitrogen, deposited a CrN transition layer at a pressure of 0.1Pa and a bias of -100V, and the thickness of the CrN transition layer was 100 nanometers; finally deposited a Cr-O-N nanocrystalline wear-resistant coating at a pressure of 0.1Pa and a bias of -100V. The flow ratio of nitrogen and oxygen is constant at 1:1, and the Cr-O-N nano-grain size is 200nm. The thickness of the Cr-O-N wear-resistant coating is 0.5 microns. The total thickness of the coating is controlled at 0.62 microns, and after the preparation is completed, it is naturally cooled to obtain a Cr-O-N nanocrystalline composite ceramic coating piston ring.

Embodiment 2

[0040] Example 2: Under the condition of 250 ℃ and argon gas, the piston ring was glow cleaned; after the completion, the transition metal Cr bonding layer was deposited under the condition of air pressure 0.01Pa and bias voltage -800V, and the thickness of the Cr bonding layer was 100 nm; Nitrogen, deposit a CrN transition layer under the condition of pressure 0.5Pa, bias -200V, the thickness of the CrN transition layer is 300 nanometers; finally, deposit Cr-O-N wear-resistant coating under the condition of pressure 0.5Pa, bias -200V, control nitrogen and The flow ratio of oxygen is 2:1, the Cr-O-N nano-grain size is 140 nm, and the thickness of the Cr-O-N wear-resistant coating is 10 microns. The total thickness of the coating is controlled at 10.4 microns, and after the preparation is completed, it is naturally cooled to obtain a Cr-O-N nanocrystalline composite ceramic coating piston ring.

Embodiment 3

[0041] Example 3: Under the condition of 350 ℃ and argon gas, the piston ring was glow cleaned; after the end, the transition metal Cr bonding layer was deposited under the condition of air pressure 0.05Pa and bias voltage -900V, and the thickness of the Cr bonding layer was 200 nanometers; Nitrogen, deposited a CrN transition layer under the conditions of pressure 1Pa, bias -200V, and the thickness of the CrN transition layer was 500 nanometers; finally, deposited a Cr-O-N wear-resistant coating under the conditions of pressure 1Pa, bias -200V, and controlled the gap between nitrogen and oxygen. The flow ratio is such that it is 5:1 and 1:1 alternately every five minutes, and the Cr-O-N nanocrystal grain size is 40-50 nm. The thickness of the Cr-O-N wear-resistant coating is 20 microns. The total thickness of the coating is controlled at 20.7 microns, and after the preparation is completed, it is naturally cooled to obtain a Cr-O-N nanocrystalline composite ceramic coating ...

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Abstract

The invention discloses a fuel-saving Cr-O-N nanocrystalline composite ceramic coated piston ring of a diesel engine and a preparation method of the fuel-saving Cr-O-N nanocrystalline composite ceramic coated piston ring of the diesel engine. The nanocrystalline composite ceramic coated piston ring which is composed of Cr, CrN and a Cr-O-N nanometer crystal layer in sequence is generated by means of the technology of arc ion plating. The fuel-saving type Cr-O-N nanocrystalline composite ceramic coated piston ring of the diesel engine and the preparation method of the fuel-saving Cr-O-N nanocrystalline composite ceramic coated piston ring are reasonable in structural design and achieve gradual change of components and the hardness gradient. In addition, the prepared Cr-O-N nanocrystalline composite ceramic coating layer and the piston ring have the advantages that good binding force, good wear-resistant property and corrosion-resistent property are provided, higher oil storage capability and hardness are provided, the defects that existing piston rings are poor in wear-resistant property and insufficient in oil storage capacity are overcome, long-term stable work of the piston ring is ensured, and the using performance of the piston ring is enabled to be greatly improved. Moreover, the fuel-saving type Cr-O-N nanocrystalline composite ceramic coated piston ring of the diesel engine has the advantages of being stable in quality in the process of coating, high in processing efficiency, and capable of reducing production cost of factories and having good industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of thin film materials, in particular to an oil-saving Cr-O-N nanocrystalline composite ceramic coating diesel engine piston ring and a preparation method thereof. Background technique [0002] In recent years, with the continuous acceleration of the industrialization process, the application of engines in social life has become more and more extensive. The piston ring-cylinder liner is an important factor affecting the ideal combustion of the engine, and its tribological properties have a direct impact on the environmental protection and energy-saving performance of the entire engine. Smaller size, higher efficiency, and lower emissions are the development trend of engines, which put forward higher requirements for piston rings. [0003] Chrome plating on the surface of piston ring is one of the effective measures to improve its service life. It changes the nature of the friction surface by covering the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F5/00C23C14/06C23C14/38
Inventor 杨小芳刘贞贞杨兵王如意刘辉东万强
Owner WUHAN UNIV
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