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Ion nitriding method for titanium alloy

A technology of ion nitriding and titanium alloy, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems affecting the structure and performance of the workpiece, high temperature in the nitriding process, long nitriding time, etc. , to achieve the effects of increasing the penetration rate, reducing the nitriding temperature, and good wear resistance

Inactive Publication Date: 2020-06-12
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used ion nitriding treatment methods have defects such as slow permeation speed, long nitriding time, and high temperature during nitriding process, which affect the structure and performance of the workpiece.

Method used

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  • Ion nitriding method for titanium alloy
  • Ion nitriding method for titanium alloy
  • Ion nitriding method for titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a titanium alloy ion nitriding method, which comprises the following steps:

[0042] (1) Degrease and derust the TC4 titanium alloy workpiece;

[0043] (2) Put the dried workpiece into the ion nitriding furnace, and evacuate it to below 5Pa;

[0044] (3) The ratio of hydrogen gas to argon gas is 1:2, the air pressure is 30Pa, the bias voltage is 500V, and the sputtering is cleaned for 60 minutes;

[0045] (4) The hydrogen content is 5%, the argon content is 10%, the rare earth yttrium oxide is 0.5%, CO 2 Gas 40%, the balance is nitrogen. When nitriding, the voltage is 500-600V, the temperature in the furnace is slowly raised to 750°C, the heating rate is 2-5°C / min, the air pressure is 600-800Pa, and the temperature is kept for 12 hours. During nitriding, the temperature in the furnace is controlled to rise slowly to 750°C. During this process, the pressure and voltage of nitriding can be adjusted adaptively within the corresponding ran...

Embodiment 2

[0048] The present embodiment provides a titanium alloy ion nitriding method, which comprises the following steps:

[0049] (1) Degrease and derust the TC4 titanium alloy workpiece;

[0050](2) Put the dried workpiece into the ion nitriding furnace, and evacuate it to below 5Pa;

[0051] (3) The volume ratio of hydrogen and argon is 1:1, the air pressure is 100Pa, the bias voltage is 1000V, and the sputtering is cleaned for 30 minutes;

[0052] (4) The content of hydrogen gas is 10%, the content of argon gas is 20%, 3% of yttrium oxide rare earth, CO 2 Gas 20%, the balance is nitrogen. When nitriding, the voltage is 550-700V, the temperature is slowly raised to 850°C, the heating rate is 2-5°C / min, the air pressure is 1000-1500Pa, and the temperature is kept for 4 hours. During nitriding, the temperature in the furnace is controlled to rise slowly to 850°C, and the pressure and voltage of nitriding can be adaptively adjusted within the corresponding range during the nitridi...

Embodiment 3

[0055] The present embodiment provides a titanium alloy ion nitriding method, which comprises the following steps:

[0056] (1) Degrease and derust the TC4 titanium alloy workpiece;

[0057] (2) Put the dried workpiece into the ion nitriding furnace, and evacuate it to below 5Pa;

[0058] (3) The ratio of hydrogen gas to argon gas is 2:1, the air pressure is 60Pa, the bias voltage is 800V, and the sputtering is cleaned for 50 minutes;

[0059] (4) The hydrogen content of feeding is 10%, the argon content is 10%, the rare earth lanthanum oxide is 3%, and the N 2 O gas is 40%, propane gas is 1%, and the balance is ammonia gas. The voltage during nitriding is 550-650V, the temperature is slowly raised to 900°C, the heating rate is 2-5°C / min, the air pressure is 800-1000Pa, and the temperature is kept for 4 hours. During nitriding, the temperature in the furnace is controlled to rise slowly to 900°C, and the pressure and voltage of nitriding can be adaptively adjusted within th...

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Abstract

The invention discloses an ion nitriding method for titanium alloy, and relates to the technical field of surface treatment. The method comprises the steps that a workpiece is placed in a plasma nitriding furnace, nitriding gas is introduced, the nitriding voltage is controlled to range from 500 V to 700 V, the temperature in the plasma nitriding furnace is controlled to slowly rise to 750 DEG C to 950 DEG C, the air pressure ranges from 500 Pa to 1500 Pa, and heat preservation is carried out to obtain a required nitriding layer thickness; and the nitriding gas comprises nitrogen-containing gas, hydrogen, argon and a permeation accelerant, and the permeation accelerant comprises at least one of rare earth oxide, oxygen-containing gas and carbon-containing gas. The nitriding method has thecharacteristics of high nitriding speed, capability of reducing the nitriding temperature, thick nitriding layer, high hardness, good wear resistance and small workpiece deformation.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a titanium alloy ion nitriding method. Background technique [0002] Titanium and titanium alloys have excellent comprehensive properties and are widely used in aerospace, automotive and other fields. However, titanium alloys have low surface hardness and poor wear resistance, which limit the wide application of titanium alloys. Ion nitriding is a commonly used surface treatment method, which can obtain a surface with thick permeation layer and high surface hardness. At present, the commonly used ion nitriding treatment methods have defects such as slow nitriding speed, long nitriding time, and high temperature in the nitriding process, which affect the structure and performance of the workpiece. [0003] In view of this, the present invention is proposed. Contents of the invention [0004] The purpose of the present invention is to provide a titanium alloy ion nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/24C23C8/36
CPCC23C8/24C23C8/36
Inventor 韦春贝韦乃安林松盛代明江侯惠君李洪石倩唐鹏苏一凡郭朝乾汪唯
Owner GUANGDONG INST OF NEW MATERIALS
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