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Method for preparing diamond-like composite coating on surface of piston ring

A composite coating and piston ring technology, applied in the field of piston rings, can solve problems such as the deterioration of the lubrication environment and the harsh operating environment of piston rings, and achieve good comprehensive performance, excellent anti-wear and self-lubricating performance, and low emission effects

Inactive Publication Date: 2010-03-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deterioration of the lubrication environment caused by high speed, high load and thermal fatigue makes the operating environment of the piston ring (lean oil or semi-dry friction state) more harsh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take the vanadium-titanium alloy cast iron piston ring, its main parameters are: a thin open ring part with a diameter of 120mm, a diameter width of 4mm, and a thickness of 2.5mm. Its chemical composition (mass fraction, %) is 0.65-3.9C, 2.3-2.9Si, 0.6-1.0Mn, ≤0.69S, 0.18-0.25V, 0.05-0.15Ti, and the rest is Fe. The specific operation steps are:

[0022] 1. Low-temperature plasma nitriding treatment: Place the piston ring to be treated in the LDM2-25 pulse direct current low-temperature plasma nitriding furnace. The ion nitriding piston ring is installed in a free-stacking type, with the openings aligned, radially facing the furnace body Center direction. When the vacuum degree is below 2Pa, the mixed gas of nitrogen and hydrogen is introduced for plasma nitriding treatment, the current density is 1-3mA / cm2, the temperature is raised to 400-580°C, kept for 6-8 hours, and then cooled to 150°C with the furnace , that is, the nitriding treatment on the surface of the pist...

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PUM

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Abstract

The invention relates to a method for preparing a diamond-like composite coating with high hardness and good abrasion proof and self lubricating properties on the surface of a piston ring. In the method, a nitriding layer with high bonding strength, high hardness and good abrasion resistance is formed on the surface of the piston ring by the low-temperature plasma nitriding treatment, a non-hydrogen diamond-like surface layer with solid lubricating property is deposited by the combination of magnetic filtration cathode arc and magnetic control sputtering, and finally the nitriding / diamond-likecomposite coating, which is dense and smooth and possesses excellent abrasion proof and self-lubricating properties, is obtained on the surface of the piston ring. Compared with the durionising piston ring or CrN plating piston ring, the coating of the piston ring of the invention has higher comprehensive performance.

Description

technical field [0001] The invention relates to an environmentally friendly piston ring surface processing method, in particular to a method of combining plasma nitriding / physical vapor phase composite deposition to obtain a nitrided / diamond-like composite coating on the surface of the piston ring, which belongs to the piston ring technology field. Background technique [0002] The piston ring is the main moving part and wearing part of the internal combustion engine, and the working environment is very harsh when reciprocating in the cylinder liner. The movement speed of the piston ring between the top and bottom dead centers is cyclically changed, and at the same time, the variable contact pressure and poor lubrication conditions, especially the first ring is also corroded by high-temperature gas. The burning of the oil film by the gas often makes the piston ring work in a semi-dry friction or dry friction state, so wear is the main failure mode of the piston ring. In or...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C8/24C23C14/35
Inventor 王立平薛群基张广安
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI