Method for preparing antifriction anti-fretting strengthening layer on surface of titanium alloy

A technology of titanium alloy and strengthening layer, which is applied in the field of preparing anti-friction and anti-fretting strengthening layer on the surface of titanium alloy, which can solve the problems affecting the structure and performance of titanium alloy matrix, the wear resistance of titanium alloy surface is not very ideal, and the processing temperature is high , to improve the anti-fretting performance, solve the effect of thin permeable layer, weak binding force of membrane base and large thickness of permeable layer

Inactive Publication Date: 2019-06-04
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
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Problems solved by technology

However, ion nitriding still has the problem of high treatment temperature and long time, which affects the structure and performance of the titanium alloy matrix to a certain extent.
Therefore, it is not ideal to use ion nitriding technology alone to improve the surface wear resistance of titanium alloys.

Method used

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  • Method for preparing antifriction anti-fretting strengthening layer on surface of titanium alloy
  • Method for preparing antifriction anti-fretting strengthening layer on surface of titanium alloy
  • Method for preparing antifriction anti-fretting strengthening layer on surface of titanium alloy

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with accompanying drawing:

[0038] Sample Preparation:

[0039] (1) Grind the titanium alloy with SiC sandpaper 600#, 800#, 1000#, 1200#, 1500#, 2000# in turn, polish the polishing cloth until the surface roughness is below 1 μm, and then use acetone or alcohol to perform ultrasonic cleaning for 15 -20min, get the sample;

[0040] (2) Put the sample on the chuck of the machine tool in the ultrasonic cold forging equipment, clamp it with screws, turn on the power, observe the display screen, set the processing parameters as: working current 0.78A, frequency 20KHz, amplitude 10μm, so that Ultrasonic vibration;

[0041] (3) Add the mixed solution of cutting fluid and water into the water tank of the ultrasonic cold forging equipment, run the CNC machine tool in the ultrasonic cold forging equipment, the spindle speed of the CNC machine tool is 150r / min, the feed rate is 0.03mm / r, and the static pressur...

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Abstract

The invention discloses a method for preparing an antifriction anti-fretting strengthening layer on the surface of a titanium alloy, and belongs to the technical field of aerospace material surface strengthening. Firstly, surface nanocrystallization pretreatment is performed on the titanium alloy to form a nano layer on the surface of the titanium alloy (the surface grain reaches nano level), simultaneously, ion nitridation treatment is performed on the basis of the pretreatment to solve the problems of low hardness and non-wear resistance of the titanium alloy and the problems of thin nitrided layer and weak bonding force of film base, and to improve the fretting resistance of different counter pairs in fretting wear process; and the surface nanocrystallization technology and the ion nitriding technology are combined and applied to TC4 titanium alloy, so that the problems of low hardness and poor wear resistance of the titanium alloy are solved, and the fretting performance problem ofthe titanium alloy under different working conditions (counter pairs) after composite treatment is solved as well. The TC4 aerospace titanium alloy with antifriction anti-fretting strengthening layeron the surface has higher anti-fretting performance and good reliability and stability when being applied to wear-resistant parts such as spacecraft fasteners.

Description

technical field [0001] The invention belongs to the technical field of aerospace material surface strengthening, and in particular relates to a method for preparing a friction-reducing and anti-fretting strengthening layer on the surface of a titanium alloy. Background technique [0002] A large number of advanced titanium alloy materials and their application technologies are used to increase the amount of titanium alloy used and the service life of titanium alloy. At the same time, the aerospace industry is an important symbol of a country's comprehensive strength. [0003] For aerospace materials, light weight, high strength, corrosion resistance, and high and low temperature resistance are important criteria for material selection, while titanium alloys have excellent properties such as low density, high specific strength, corrosion resistance, non-toxic, non-magnetic, and good biocompatibility. It is known as "cosmic metal" and "space metal". In spacecraft, the high s...

Claims

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Application Information

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IPC IPC(8): C23F17/00C22F1/18C23C8/36C23C8/02
Inventor 康嘉杰元云岗岳文付志强朱丽娜王成彪
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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