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Surface modification treatment method combining pre-oxidizing, ion nitriding and ion oxynitriding

A technology of ion nitriding and oxynitriding, which is applied in metal material coating process, coating, solid diffusion coating, etc., can solve the problems of low nitriding efficiency and low equipment utilization rate, and improve the thickness of the nitriding layer. , The thickness of the compound layer is increased, and the operation process is simple and convenient.

Active Publication Date: 2016-04-20
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: based on the above problems of low nitriding efficiency and low equipment utilization rate, the present invention provides a metal surface chemical heat treatment process with simple and convenient operation process, high efficiency and energy saving. The treatment method combining nitrogen and ion nitrogen oxygen co-infiltration, adding appropriate amount of air can promote the diffusion and adsorption of active nitrogen atoms at different stages, thereby improving the nitriding efficiency

Method used

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  • Surface modification treatment method combining pre-oxidizing, ion nitriding and ion oxynitriding
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  • Surface modification treatment method combining pre-oxidizing, ion nitriding and ion oxynitriding

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Effect test

Embodiment 1

[0025] 1) Process the raw steel into a sample with a size of 10mm×10mm×5mm;

[0026] 2) Refining and tempering the sample, first raising the temperature to 840°C for 7.5 minutes, then water cooling, then raising the temperature to 560°C for 30 minutes, then air cooling to room temperature;

[0027] 3) Grind the samples to the mirror surface with 500#~2000# SiC sandpaper respectively;

[0028] 4) Soak the sample in 20ml of absolute ethanol and perform ultrasonic cleaning for 15 minutes to remove oxides and stains on the surface of the sample, and dry it for later use;

[0029] 5) Place the sample in the ion nitriding furnace, evacuate to below 10Pa, pass in hydrogen gas for sputtering for 30 minutes, the flow rate of hydrogen gas is 500ml / min, and the pressure in the furnace is kept at 300Pa; turn off the hydrogen gas and raise the temperature of the furnace To 300°C, the air flow rate is 3L / min, the pressure in the furnace is set to free pressure, and the pre-oxidation is 45m...

Embodiment 2

[0032] 1) Process the raw steel into a sample with a size of 10mm×10mm×5mm;

[0033] 2) Refining and tempering the sample, first raising the temperature to 840°C for 7.5 minutes, then water cooling, then raising the temperature to 560°C for 30 minutes, then air cooling to room temperature;

[0034] 3) Grind the samples to the mirror surface with 500#~2000# SiC sandpaper respectively;

[0035] 4) Soak the sample in 20ml of absolute ethanol and perform ultrasonic cleaning for 15 minutes to remove oxides and stains on the surface of the sample, and dry it for later use;

[0036] 5) Place the sample in the ion nitriding furnace, evacuate to below 10Pa, pass in hydrogen gas for sputtering for 30 minutes, the flow rate of hydrogen gas is 500ml / min, and the pressure in the furnace is kept at 300Pa; turn off the hydrogen gas and raise the temperature of the furnace To 300°C, the air flow rate is 3L / min, the pressure in the furnace is set to free pressure, and the pre-oxidation is 45m...

Embodiment 3

[0039] 1) Process the raw steel into a sample with a size of 10mm×10mm×5mm;

[0040] 2) Refining and tempering the sample, first raising the temperature to 840°C for 7.5 minutes, then water cooling, then raising the temperature to 560°C for 30 minutes, then air cooling to room temperature;

[0041] 3) Grind the samples to the mirror surface with 500#~2000# SiC sandpaper respectively;

[0042] 4) Soak the sample in 20ml of absolute ethanol and perform ultrasonic cleaning for 15 minutes to remove oxides and stains on the surface of the sample, and dry it for later use;

[0043]5) Place the sample in the ion nitriding furnace, evacuate to below 10Pa, pass in hydrogen gas for sputtering for 30 minutes, the flow rate of hydrogen gas is 500ml / min, and the pressure in the furnace is kept at 300Pa; turn off the hydrogen gas and raise the temperature of the furnace To 300°C, the air flow rate is 3L / min, the pressure in the furnace is set to free pressure, and the pre-oxidation is 45mi...

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Abstract

The invention relates to a surface modification treatment method combining pre-oxidizing, ion nitriding and ion oxynitriding. The method comprises the steps of machining and cutting original steel for forming a sample; carrying out hardening and tempering on the sample, ultrasonically cleaning the polished sample in organic solutions and drying the sample; placing the sample in an ion nitriding furnace, vacuumizing the furnace, guiding hydrogen gas into the furnace for sputtering, sequentially carrying out the three surface treatment steps of pre-oxidizing, ion nitriding and ion oxynitriding and then cooling the sample to the indoor temperature along with the furnace. The method has the beneficial effects that an oxidation film is formed on the surface layer of the sample at the first stage; the oxidation film is gradually reduced by the hydrogen gas because the air is stopped at the second stage, then a loose and porous diffusion path is formed, and the catalytic effect of pre-oxidizing is realized; at the third stage, because the oxidation film is reduced at the second stage, the air is input again for realizing the catalytic effect of oxynitriding; the operation process is simple, convenient and fast, the nitriding rate and the thickness of nitridedlayers can be increased greatly in a short time, the efficiency is high, and the energy is saved.

Description

technical field [0001] The invention relates to a three-step compound surface modification treatment method of pre-oxidation, ion nitriding, and ion nitriding. Background technique [0002] In engineering applications, ion nitriding is a widely used surface heat treatment technology. This technology mainly produces active nitrogen atoms through cathode sputtering, enriches on the surface of the sample and continuously diffuses into the matrix, and finally forms nitriding. layer. Pre-oxidation is a process of oxidizing the surface of the sample before ion nitriding, and ion nitriding is adding an appropriate amount of air during ion nitriding. Both of them have fast penetration speed, gentle hardness gradient, and corrosion resistance. Good sex and other advantages. [0003] In chemical heat treatment technology, nitriding technology includes gas nitriding, ion nitriding, salt bath nitriding, etc. Although ion nitriding and salt bath nitriding can obtain a certain thicknes...

Claims

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Application Information

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IPC IPC(8): C23C8/38C23C8/34
CPCC23C8/34C23C8/38
Inventor 胡静刘晗缪斌
Owner CHANGZHOU UNIV
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