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Surface treatment method of titanium alloy carbon and nitrogen compound permeation

A technology of surface treatment and composite infiltration, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems that can not meet the needs of use, the performance improvement of titanium alloy is not ideal, and achieve accelerated collision and adsorption. Effects of increased speed and reaction rate

Inactive Publication Date: 2016-03-23
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the single nitriding or carburizing surface modification technology of titanium alloy has certain defects, and the performance improvement of titanium alloy is not ideal enough to meet the needs of use.

Method used

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  • Surface treatment method of titanium alloy carbon and nitrogen compound permeation
  • Surface treatment method of titanium alloy carbon and nitrogen compound permeation
  • Surface treatment method of titanium alloy carbon and nitrogen compound permeation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: acetylene+nitrogen:

[0034] Pretreatment of TC4 titanium alloy samples before infiltration (arranging, cleaning and activation of samples, etc.), put the pretreated samples into the reactor tank, seal the reaction tank, check for leaks and exhaust air, and then pass the vacuum The system 8 is evacuated and the reactor is heated by means of a vacuum tube furnace 3 in the reactor tank.

[0035] The specific operation of the carbon-nitrogen compound infiltration is as follows: before the titanium alloy sample is put into the furnace, the argon (0.1MPa) in the high-purity argon tank 6 is used to exhaust it twice, and the first exhaust is used for leak detection. And exhaust the gas in the vacuum reaction tank, the second exhaust is used to ensure that the air in the high temperature reactor has been exhausted to prevent oxidation of the workpiece. After exhausting, start vacuuming and raise the temperature of the furnace to 900°C for 1 hour for degassing and...

Embodiment 2

[0037] Example 2: nitrogen + (acetylene + argon):

[0038] Perform pre-infiltration pretreatment on the TC4 titanium alloy sample (sample arrangement, cleaning and activation treatment, etc.), put the pretreated sample into the reactor tank, and seal the reactor tank, leak detection, and exhaust Finally, the vacuum is evacuated by the vacuum system 8, and the reaction tank is heated by the vacuum tube heating furnace 3 in the reactor tank.

[0039] The specific operation of the compound infiltration of carbon and nitrogen gas is: before the vacuum reactor is put into the furnace, it is exhausted twice with argon (0.1MPa) in the high-purity argon tank 6, and the first exhaust is used for leak detection and discharge. The air in the reaction tank, the second exhaust is mainly to ensure that the air in the high temperature reaction tank has been exhausted to prevent the oxidation of the workpiece. After exhausting, start vacuuming and raise the temperature of the furnace to 900°...

Embodiment 3

[0041] Example 3: (acetylene + argon) + (nitrogen + argon):

[0042] Pretreatment of TC4 titanium alloy samples before infiltration (arrangement, cleaning and activation of samples, etc.), put the pretreated samples into the reactor tank, seal the reaction tank, leak detection and exhaust, and then pass the vacuum The system 8 is evacuated, and the reaction tank is heated by the vacuum tube heating furnace 3 in the reactor tank.

[0043] The specific operation of the carbon-nitrogen compound infiltration is as follows: before the titanium alloy sample is put into the furnace, the argon (0.1MPa) in the high-purity argon tank 6 is used to exhaust it twice, and the first exhaust is used for leak detection. And exhaust the gas in the vacuum reaction tank, the second exhaust is used to ensure that the air in the high temperature reactor has been exhausted to prevent oxidation of the workpiece. After exhausting, start vacuuming and raise the temperature of the furnace to 900°C for ...

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Abstract

The invention discloses a surface treatment method of titanium alloy carbon and nitrogen compound permeation. The surface treatment method comprises a method of alternately and intermittently feeding a carburizing gas medium and a nitriding gas medium and combining the carburizing treatment with the nitriding treatment, and comprises a method of carburizing or nitriding inflation compound permeation treatment formed by combining the intermittent periodical repeated inflation and extraction treatment with the carburizing and nitriding treatment. The surface treatment method combines the gas carburizing with the gas nitriding to make up the defects caused by single gas carburizing, so that titanium nitrides, titanium carbides and titanium carbonitrides are generated on the surface of titanium alloy to facilitate improvement of the surface performance of the titanium alloy. The intermittent periodical repeated inflation and extraction treatment is adopted to enable acceleration of the absorption speed and the reaction speed of permeated elements on the surface of a workpiece. A medium of the compound permeation is high-purity acetylene gas or high-purity acetylene and high-purity argon, so that the surface performance of the titanium alloy can be further improved, and the hydrogen embrittlement is prevented.

Description

technical field [0001] The invention relates to a surface treatment method of titanium alloy low-pressure vacuum carburizing and combined nitriding, belonging to the technical field of titanium alloy surface modification. Background technique [0002] Titanium alloy has the advantages of high specific strength, good corrosion resistance, high temperature resistance and good biocompatibility, and is widely used in machinery, energy, petrochemical, aerospace and bioengineering and other fields. However, the surface hardness of titanium alloy is not high, its wear resistance and fatigue resistance are poor, and it is easy to cause adhesive wear with gas metal materials, so its application range is greatly limited. [0003] Among all alloy elements, nitrogen has the greatest influence on the hardness of titanium. Titanium nitride has the advantages of high hardness, excellent chemical stability, low friction coefficient, excellent biocompatibility and good electrical conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/34
CPCC23C8/34
Inventor 杨闯刘静祝圆圆马亚芹万月红杨文飞陈希和
Owner GUIZHOU NORMAL UNIVERSITY
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