Cr4Mo4V steel bearing carbon-nitrogen plasma radical ion carburizing method by means of warming

A plasma and bearing technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of shallow modified layer, etc., and achieve the effects of high production efficiency, safe and convenient operation control, and convenient operation

Active Publication Date: 2012-07-25
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing method of increasing the temperature of the workpiece to form a continuous compound layer on the surface of the workpiece. A Cr 4 Mo 4 C-N plasma-based ion heating and infiltration method for V steel bearings
[0006] The invention solves the problem of shallow modified layer of plasma-based ion implantation technology by increasing the temperature of the bearing during the implantation process and increasing the thickness of the modified layer by using the diffusion effect

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  • Cr4Mo4V steel bearing carbon-nitrogen plasma radical ion carburizing method by means of warming

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specific Embodiment approach 1

[0018] Specific implementation mode one: Cr in this implementation mode 4 Mo 4 The carbon-nitrogen plasma-based ion heating and infiltration method for V steel bearings is as follows: 1. Ultrasonic cleaning: Cr 4 Mo 4 Put the V-steel bearing into an acetone solution with a purity of more than 99.9%, and ultrasonically clean it twice at an ultrasonic frequency of 40kHz, and the time for each ultrasonic cleaning is 8min to 15min; Cr 4 Mo 4 Put the V-steel bearing on the sample stage of the vacuum chamber, and evacuate to a vacuum degree of 1.0×10 -4 Pa~1.0×10 -3 Pa, raise the temperature to 300°C~400°C, and then work at a working pressure of 5Pa~10Pa, a radio frequency power of 0.8kW~2kW, a voltage of 500V~700V, and a current of 0.2mA / cm 2 ~0.5mA / cm 2 Under certain conditions, adjust the RF power so that the generated argon plasma concentration is 1.0×10 9 / cm 3 ~1.0×10 10 / cm 3 , perform pre-sputtering cleaning for 10min to 30min; 3. Carbon and nitrogen ion implantat...

specific Embodiment approach 2

[0021] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step two, Cr 4 Mo 4 The V-steel bearings were pre-sputtered and cleaned for 20 minutes, the radio frequency power was 1.2kW-1.5kW, and the voltage was 550V-650V. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step two, Cr 4 Mo 4 V-steel bearings are pre-sputtered and cleaned for 30 minutes, the radio frequency power is 0.8kW-1.5kW, and the current is 0.25mA / cm 2 . Others are the same as in the first embodiment.

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Abstract

The invention provides a Cr4Mo4V steel bearing carbon-nitrogen plasma radical ion carburizing method by means of warming, relates to a steel bearing carbon-nitrogen carburizing method, and aims at solving the problem of the formation of a continues compound layer on the surface of a workpiece by the existing method for improving the temperature of the workpiece. The method comprises the steps of:1. ultrasonic cleaning; 2. pre-sputtering; 3. carbon-nitrogen ion injecting; and 4. secondary nitrogen ion injecting. The surface nanometer hardness of the Cr4Mo4V bearing which is processed by the method can reach 22 GPa, is 1.8 times as good that of the Cr4Mo4V bearing which is unprocessed, and is equal to that of the bearing with a compound layer, and the surface is Cr4Mo4V steel bearing is free of the compound layer, so that the fatigue life of the Cr4Mo4V steel bearing is improved by 3 times compared with the fatigue life of the bearing with the compound layer; and the wear resistance ofthe Cr4Mo4V steel which is processed by the method is 5 times as good as that of the Cr4Mo4V steel which is unprocessed, and the rack experiment assessment life of the Cr4Mo4V bearing which is processed by the method is more than 2.5 times as long as that of the bearing which is unprocessed.

Description

technical field [0001] The invention relates to a method for injecting and infiltrating steel bearing carbon and nitrogen. Background technique [0002] With the development of my country's aviation technology, the performance requirements of the engine continue to increase, and the working conditions of the engine main shaft bearing are becoming more and more harsh, resulting in a continuous reduction in the life of the bearing. Cr 4 Mo 4 V-bearing steel has excellent high-temperature performance and is the most important steel for main shaft bearings of aero-engines in my country. However, the service life of Cr4Mo4V bearing steel bearings has been unable to meet the requirements of use under some heavy-duty conditions, and has become a constraint on the life of aero-engines. A bottleneck problem. [0003] At present, the surface modification method is mostly used to strengthen the bearing surface to improve the life of the spindle bearing. Due to the particularity of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/38C23C8/02
Inventor 唐光泽马新欣李忠文
Owner HARBIN INST OF TECH
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