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Method for improving surface tribology performance of M50NiL bearing steel

A technology of surface friction and bearing steel, applied in the direction of ion implantation plating, coating, metal material coating technology, etc., can solve problems such as economic loss, bad social impact, bearing wear failure, etc., to improve tribological performance, improve Effects of film-substrate adhesion and friction properties

Active Publication Date: 2018-08-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, traditional oil and grease lubrication can only exert good lubrication performance in low-load environments below 300°C. Therefore, under conditions such as temperature rise, engine start / stop, working mode conversion, and harsh working conditions, aviation bearings The friction and wear of the bearing inner ring and the rolling body is inevitable, resulting in bearing wear and failure
Once the main shaft bearing of the aero-engine wears out, it is likely to cause the bearing to be stuck, and even lead to catastrophic consequences such as engine shaft locking and broken shaft, which will not only cause serious economic losses, but also cause catastrophic casualties and poor society. influences

Method used

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  • Method for improving surface tribology performance of M50NiL bearing steel
  • Method for improving surface tribology performance of M50NiL bearing steel
  • Method for improving surface tribology performance of M50NiL bearing steel

Examples

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Effect test

Embodiment 1

[0033] 1) Vacuum pulse carburizing treatment

[0034] The surface carburizing treatment adopts the vacuum pulse carburizing method. Each pulse cycle includes a strong carburizing process, that is, the introduction of carburizing gas and a diffusion process, that is, stopping inflation and vacuuming, and the time of the diffusion process is 4 times that of the strong carburizing process. times, the carburizing temperature is 900°C, and the time is 6h. After carburizing, perform high-temperature tempering twice, the tempering temperature is about 700°C, and the holding time is about 420min;

[0035] 2) Quenching and tempering treatment

[0036] The holding temperature is 1050-1110°C, quenching after holding time for 90 minutes; cold treatment at -70°C for 60 minutes, tempering treatment at 530-550°C for 180 minutes; repeat cold treatment and tempering at -70°C once.

[0037] 3) Polishing and cleaning of M50NiL bearing steel substrate

[0038] Use 400-600, 800-1000, 1200, and ...

Embodiment 2

[0049] 1) Vacuum pulse carburizing treatment

[0050] The surface carburizing treatment adopts the vacuum pulse carburizing method. Each pulse cycle includes a strong carburizing process, that is, the introduction of carburizing gas and a diffusion process, that is, stopping inflation and vacuuming, and the time of the diffusion process is 4 times that of the strong carburizing process. times, the carburizing temperature is 900°C, and the time is about 6h. After carburizing, perform high-temperature tempering twice, the tempering temperature is about 700°C, and the holding time is about 420min.

[0051] 2) Quenching and tempering treatment

[0052] The holding temperature is 1050-1110°C, quenching after holding time for 90 minutes; cold treatment at -70°C for 60 minutes, tempering treatment at 530-550°C for 180 minutes; repeat cold treatment and tempering at -70°C once.

[0053] 3) Polishing and cleaning of M50NiL bearing steel substrate

[0054] Use 400-600, 800-1000, 1200...

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Abstract

The invention discloses a method for improving the surface tribology performance of M50NiL bearing steel, and belongs to the technical field of material surface modification. The vacuum pulse carburization technology is adopted for conducting carburization and high-temperature tempering treatment on the surface of an M50NiL bearing steel base material; then quenching and tempering treatment is conducted; a surface white bright layer of the M50NiL bearing steel base material is removed; and a binding layer, a chromium metal layer, a Cr->GLC gradient layer and a GLC base solid lubricating film are deposited on the surface of the M50NiL bearing steel base material through the multi-target non-magnetic-control sputtering technology. According to the method, the surface carbonization technologyand the unbalanced-magnetic-control sputtering technology are combined, on one hand, the surface of the M50NiL bearing steel is intensified through the carbonization technology, and good support is provided for the GLC base solid lubricating film; on the other hand, the unbalanced-magnetic-control sputtering technology is utilized for preparing the GLC base solid lubricating film with good self-adaptability and tribology performance, and the friction reducing and abrasion resisting performance of the surface of the M50NiL bearing steel is obviously improved.

Description

technical field [0001] The invention relates to the technical field of material surface modification, in particular to a method for improving the surface tribological properties of M50NiL bearing steel. Background technique [0002] M50NiL steel is a new generation of high-temperature high-strength bearing steel successfully developed in the 1980s. It is widely used in the third-generation aero-engine main shaft bearings. There have been a lot of researches on its anti-fatigue characteristics, but the anti-friction and anti-wear properties of its surface There isn't much to say about performance. At present, my country's aviation bearings mainly use oil and grease lubrication to reduce friction, and use surface carburizing technology to improve the mechanical properties and anti-wear capabilities of bearing friction surfaces. [0003] With the rapid development of aviation technology and machinery industry, aero-engines continue to develop towards high thrust-to-weight rati...

Claims

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Application Information

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IPC IPC(8): C23C8/22C23C8/80C21D1/18C23C14/34C23C14/16C23C14/06C23F17/00
CPCC21D1/18C23C8/22C23C8/80C23C14/0605C23C14/165C23C14/3464C23F17/00
Inventor 李泽清何卫锋张虹虹聂祥樊徐雷张广安李应红
Owner XI AN JIAOTONG UNIV
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