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Multilayered gradient diamond like nano composite coating for aluminum alloy piston and preparation method thereof

A technology of diamond and aluminum alloy, which is applied in the field of new solid lubricating coating on the surface of aluminum alloy pistons and its preparation, can solve problems such as poor lubrication, achieve good overall performance, overcome high internal stress, and have good application value

Inactive Publication Date: 2011-06-15
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

[0005] The purpose of the present invention is to provide a piston coating with high hardness, high wear resistance and anti-friction self-lubricating properties under dry friction or lean oil state and its surface processing method, so as to improve the initial running-in of the piston, often Problems such as dry friction caused by cold start, short-term overload and poor lubrication caused by engine changing conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take an aluminum alloy piston of a gasoline engine with an outer diameter of 65 mm. The gradient multi-layer diamond-like composite coating structure on the surface of the aluminum alloy piston is aluminum alloy substrate / Ti layer / TiN layer / Si layer / Ti-doped diamond-like surface layer. The treatment process is as follows The steps are as follows: (1) The aluminum alloy piston is subjected to conventional degreasing cleaning, and then ultrasonic cleaning is performed sequentially in acetone and ethanol solutions; (2) The aluminum alloy piston is placed in a multi-arc ion plating-magnetron sputtering composite vapor deposition vacuum In the system, argon plasma sputtering cleaning is carried out, the flow rate of argon gas is 50-70sccm, the bias voltage is 800-1000V, and the processing time is 30-40min; (3) multi-arc ion plating Ti layer, the metal Ti target is the cathode, The processing time is 5-10 minutes; (4) TiN layer is deposited by multi-arc ion plating. The curre...

Embodiment 2

[0020] A diesel engine aluminum alloy piston with an outer diameter of 126mm is taken. The gradient multi-layer diamond-like composite coating structure on the surface of the aluminum alloy piston is aluminum alloy substrate / Cr layer / CrN layer / Si layer / / Cr-doped diamond-like surface layer, and the treatment process is as follows The steps are as follows: (1) The aluminum alloy piston is subjected to conventional degreasing cleaning, and then ultrasonic cleaning is performed sequentially in acetone and ethanol solutions; (2) The aluminum alloy piston is placed in a multi-arc ion plating-magnetron sputtering composite vapor deposition vacuum In the system, argon plasma sputtering cleaning is carried out, the flow rate of argon gas is 50-70sccm, the bias voltage is 800-1000V, and the processing time is 30-40min; (3) multi-arc ion plating Cr layer, the metal Cr target is the cathode, The processing time is 5-10 minutes; (3) Multi-arc ion plating deposits CrN layer, the metal Cr tar...

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Abstract

The invention discloses a multilayered gradient diamond like nano composite coating for an aluminum alloy piston and a preparation method thereof. The coating consists of a piston matrix, a bottom adhesive layer, a middle transition layer and a surface layer in turn, wherein the bottom is provided with a metal Ti or Cr adhesive layer; the middle transition layer is metal nitride and a Si layer; and the surface layer is a metal-doped diamond like carbon film. The wear life of the coating is improved by more than 40 times compared with that of a single-layer diamond like coating with the same thickness directly formed on the surface of aluminum alloy, and the friction coefficient under the oil lubricating condition is stabilized to be 0.05. The piston with the diamond like coating has better comprehensive performance than a piston of which the skirt is treated by MoS2, and can meet the requirements on high speed, high efficiency and low emission of a modern engine.

Description

technical field [0001] The invention relates to a novel solid lubricating coating on the surface of an aluminum alloy piston and a preparation method thereof. Specifically, a gradient multi-layer diamond-like nanocomposite coating is obtained on the piston skirt by using a physical vapor deposition technology, which belongs to the piston surface treatment technology. Background technique [0002] The piston is the key part in the engine connecting rod-piston group. The wear of the piston is generally manifested in three aspects: the wear of the piston ring groove, the burning of the top combustion chamber, and the abrasion and wear of the piston skirt. The piston skirt plays the role of guiding, bearing side thrust and heat transfer in the cylinder. Poor lubrication and wear of the piston skirt are one of the main causes of the overall piston scuffing and failure. Usually, the piston skirt needs to be coated with self-lubricating coatings such as tin or lead, sprayed graphi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B33/00B32B9/00B32B7/02C23C14/35C23C8/24C23C28/00
Inventor 王立平万善宏张广安薛群基
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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