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Preparation method of surface nanostructure of tc4 titanium alloy

A nanostructure, titanium alloy technology, applied in the field of titanium alloy surface modification, can solve the problems of poor practicability and thin thickness, and achieve the effect of increasing the thickness

Active Publication Date: 2017-01-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability caused by the thin thickness of the nanostructures prepared by the existing methods, the present invention provides a method for preparing nanostructures on the surface of TC4 titanium alloys

Method used

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  • Preparation method of surface nanostructure of tc4 titanium alloy
  • Preparation method of surface nanostructure of tc4 titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Annealing the TC4 titanium alloy in a heat treatment furnace, the treatment conditions are: heating temperature 600°C, holding time 1.5h, air cooling to room temperature;

[0018] (2) Use 80#, 240#, 600# water sandpaper to grind the surface of TC4 titanium alloy in turn, and immerse the ground TC4 titanium alloy in absolute ethanol for ultrasonic cleaning;

[0019] (3) Put the cleaned TC4 titanium alloy into the fixture, so that the grinding surface of the titanium alloy is flush with the upper surface of the fixture;

[0020] (4) Put the fixture into the shot blasting chamber, and perform shot peening treatment on the ground surface of the TC4 titanium alloy. The specific process parameters are: shot size Φ0.6mm, air pressure 0.25MPa, and shot peening time 60min.

[0021] After testing, the thickness of the nanostructure on the surface of the TC4 titanium alloy prepared in this embodiment is 40 μm.

[0022] From figure 1 It can be seen that severe plastic deforma...

Embodiment 2

[0024] (1) Annealing the TC4 titanium alloy in a heat treatment furnace, the treatment conditions are: heating temperature 630°C, holding time 1.3h, air cooling to room temperature;

[0025] (2) Use 80#, 240#, 600# water sandpaper to grind the surface of TC4 titanium alloy in turn, and immerse the ground TC4 titanium alloy in absolute ethanol for ultrasonic cleaning;

[0026] (3) Put the cleaned TC4 titanium alloy into the fixture, so that the grinding surface of the titanium alloy is flush with the upper surface of the fixture;

[0027] (4) Put the fixture into the shot blasting chamber, and perform shot peening treatment on the grinding surface of the TC4 titanium alloy. The specific process parameters are: shot size Φ1.2mm, air pressure 0.30MPa, and shot peening time 30min.

[0028] After testing, the thickness of the nanostructure on the surface of the TC4 titanium alloy prepared in this embodiment is 31 μm.

Embodiment 3

[0030] (1) Anneal the TC4 titanium alloy in a heat treatment furnace, the treatment conditions are: heating temperature 650 ° C, holding time 1 h, air cooling to room temperature;

[0031] (2) Use 80#, 240#, 600# water sandpaper to grind the surface of TC4 titanium alloy in turn, and immerse the ground TC4 titanium alloy in absolute ethanol for ultrasonic cleaning;

[0032] (3) Put the cleaned TC4 titanium alloy into the fixture, so that the grinding surface of the titanium alloy is flush with the upper surface of the fixture;

[0033] (4) Put the fixture into the shot blasting chamber, and perform shot peening treatment on the grinding surface of the TC4 titanium alloy. The specific process parameters are: shot size Φ0.8mm, air pressure 0.35MPa, and shot peening time 50min.

[0034] After testing, the thickness of the nanostructure on the surface of the TC4 titanium alloy prepared in this embodiment is 33 μm.

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Abstract

The invention discloses a preparation method of a TC4 titanium alloy surface nanostructure and aims at solving the technical problem of poor practicability due to small thickness of the nanostructure prepared by use of the existing method. The preparation method comprises the following steps: performing annealing treatment on the TC4 titanium alloy, next, grinding the surface of the TC4 titanium alloy by use of waterproof abrasive paper, immersing the ground TC4 titanium alloy in absoluteethylalcohol for ultrasonic cleaning, putting the cleaned TC4 titanium alloy into a shot-blast chamber and performing shot-blasting treatment on the ground surface of the TC4 titanium alloy. Due to the destressing annealing treatment on the TC4 titanium alloy, the TC4 titanium alloy is enabled to bear higher-pressure and longer continuous high-speed impact of shots in the shot-blasting process; the surface material flow of the TC4 titanium alloy is limited by use of a clamp in the shot-blasting process, and therefore, the thickness of the TC4 titanium alloy surface nanostructure is greatly increased. As being tested, the thickness of the prepared TC4 titanium alloy surface nanostructure is increased to the range of 31-40 microns from 10 microns in the background art.

Description

technical field [0001] The invention relates to a method for modifying the surface of a titanium alloy, in particular to a method for preparing a nanostructure on the surface of a TC4 titanium alloy. Background technique [0002] TC4 titanium alloy is a medium-strength two-phase titanium alloy, which has excellent comprehensive properties and has been widely used in the aerospace industry. As a high-performance lightweight alloy, it has broad application prospects. With the rapid development of aerospace, the harsh service environment puts forward higher requirements on the performance and reliability of TC4 titanium alloy. Nanostructured materials have attracted worldwide attention due to their unique physical, chemical and mechanical properties. The surface nanostructure prepared by mechanically induced local large plastic deformation is one of the most potential technologies in the field of nanostructured materials, which creates conditions for improving the surface and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/18
Inventor 李淼泉刘印刚刘洪杰李慧敏
Owner NORTHWESTERN POLYTECHNICAL UNIV