Method for conducting low-temperature efficient rapid ion nitriding on surface of steel workpiece

A workpiece surface, ion nitriding technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of long nitriding time, etc., to reduce the nitrogen diffusion energy barrier, increase nitrogen content, improve Effect of Nitrogen Ion Density and Hydrogen Ion Density

Active Publication Date: 2016-08-10
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the Chinese invention patent application CN103233197A adopts low vacuum pressure to increase the free path of ions generated by glow discharge, so that t...

Method used

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  • Method for conducting low-temperature efficient rapid ion nitriding on surface of steel workpiece
  • Method for conducting low-temperature efficient rapid ion nitriding on surface of steel workpiece
  • Method for conducting low-temperature efficient rapid ion nitriding on surface of steel workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Working gas is pure nitrogen

[0034] 1) After polishing the H13 steel test piece with a size of 100mmx30mmx2mm, put it in an aqueous solution containing 5wt% of commercially available "Qiqiang" metal degreasing detergent. After boiling for about 5 minutes, rinse the test piece with clean city water and dry it. Dry; hang the test piece on the fixture and put it into the vacuum coating device HIPS-820;

[0035] 2) Close the door of the vacuum chamber and start the workpiece holder to rotate; the vacuum chamber is pumped to the background and the vacuum is lower than 8x10 -3 After Pa, turn on the auxiliary heating and set it to 200°C. After the vacuum chamber is heated to the specified temperature, proceed to the next step.

[0036] 3) Inject argon gas, make the vacuum chamber pressure 0.2Pa, turn on the hollow cathode ion source, maintain the beam current at 150A; and set the auxiliary heating temperature of the vacuum chamber to 350°C.

[0037] 4) Blow in nitrogen and...

Embodiment 2

[0040] Example 2 The working gas is a mixed gas with a nitrogen / hydrogen flow ratio of 2:1

[0041] 1) After polishing the H13 steel test piece with the size of 100mmx30mmx2mm, put it in an aqueous solution containing 5wt% of commercially available "Qiqiang" metal degreasing detergent. After boiling for about 5 minutes, rinse the test piece with clean city water and dry it. Dry; hang the test piece on the fixture and put it into the HIPS-820 vacuum coating device;

[0042] 2)) Close the vacuum chamber door and turn on the workpiece holder to rotate; the vacuum chamber is pumped to the background and the vacuum is lower than 1x10 -2 After Pa, turn on the auxiliary heating and set it to 150°C. After the vacuum chamber is heated to the specified temperature, proceed to the next step.

[0043] 3) Inject argon gas to make the vacuum chamber pressure 0.2Pa, turn on the hollow cathode ion source, maintain the beam current at 100A; and set the auxiliary heating temperature of the vacuum cham...

Embodiment 3

[0046] Example 3 Working gas is flow rate ratio N 2 / H 2 / CH 4 =10:3:1 mixed gas

[0047] 1) After polishing the H13 steel test piece with the size of 100mmx30mmx2mm, put it in an aqueous solution containing 5wt% of commercially available "Qiqiang" metal degreasing detergent. After boiling for about 5 minutes, rinse the test piece with clean city water and dry it. Dry; hang the test piece on the fixture and put it into the HIPS-820 vacuum coating device;

[0048] 2)) Close the vacuum chamber door and turn on the workpiece holder to rotate; the vacuum chamber is pumped to the background and the vacuum is lower than 0.8x10 -2 After Pa, turn on auxiliary heating and set it to 170°C. After the vacuum chamber is heated to the specified temperature, proceed to the next step.

[0049] 3) Fill in argon gas, make the vacuum chamber pressure 0.2Pa, turn on the hollow cathode ion source, maintain the beam current at 120A; and set the auxiliary heating temperature of the vacuum chamber to 330°C....

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PUM

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Abstract

The invention discloses a method for conducting low-temperature efficient rapid ion nitriding on the surfaces of a steel workpiece. The method includes the steps that a metal cleaning agent is adopted to remove oil stains on the surface of the workpiece, the pretreated workpiece is fixed to a workpiece rack, a door of a vacuum chamber is closed, and the workpiece rack is started to rotate; the vacuum chamber is pumped until the background vacuum is lower than 1*10<-2> Pa; an assisting heating device is started, the vacuum chamber containing the workpiece is heated to the temperature of 150-200 DEG C; argon is introduced in, a plasma beam is obtained through a hollow cathode ion source, the furnace wall of the vacuum chamber is an anode, and the workpiece rack is a cathode; working gas is introduced, and direct-current bias voltage of 600-800 V is applied to the workpiece; high-ionization-rate plasma containing the working gas is obtained, and the whole test sample is covered with the plasma; and the thickness of a nitriding layer is controlled. The growth rate of the nitriding layer can reach 30-50 micrometers per hour.

Description

Technical field [0001] The invention relates to a method for improving the surface hardness of a steel work piece, in particular to a treatment method for rapidly obtaining surface hardening of a steel material at low temperature by using an ion source assisted ion nitriding, and belongs to the field of surface modification of metal materials. Background technique [0002] Iron-based materials such as high-speed tool steel, die steel and austenitic stainless steel are widely used in various fields of modern machinery manufacturing industry. In order to improve the surface hardness of workpieces made of these materials, many technologies have been developed, but ion nitriding is still an important and widely used method. Traditional ion nitriding uses normal glow discharge under higher vacuum pressure (400-600Pa) and higher processing temperature (450-600℃) to achieve ion nitriding. It usually takes about 10 hours to obtain about 100 Micron nitriding layer. Long-term nitriding a...

Claims

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Application Information

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IPC IPC(8): C23C8/38C23C8/26
CPCC23C8/26C23C8/38
Inventor 彭继华朱振中苏东艺
Owner SOUTH CHINA UNIV OF TECH
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