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Austenitic stainless steel ion nitriding permeation catalyzing process

A technology of austenitic stainless steel and ion nitriding, which is applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of insufficient infiltration depth and hinder the infiltration of nitrogen atoms, so as to increase the adsorption probability and The effect of adsorption capacity, reduction of nitriding time, and improvement of surface appearance quality

Inactive Publication Date: 2013-04-03
CHANGZHOU UNIV
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Problems solved by technology

Since austenitic stainless steel contains a large amount of alloying elements, the presence of alloying elements often hinders the infiltration of nitrogen atoms during the nitriding process. Therefore, the surface nitriding of austenitic stainless steel still faces the disadvantage of insufficient depth of the infiltrated layer.

Method used

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  • Austenitic stainless steel ion nitriding permeation catalyzing process
  • Austenitic stainless steel ion nitriding permeation catalyzing process
  • Austenitic stainless steel ion nitriding permeation catalyzing process

Examples

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Embodiment 1）

[0028] A process for ion nitriding and catalytic infiltration of austenitic stainless steel; it is characterized in that: the process comprises the following steps:

[0029] (1) Grind the surface of the stainless steel workpiece with 320#~1200# SiC sandpaper in turn, and then use Cr 2 O polishing powder is polished to a mirror surface;

[0030] (2) Use absolute ethanol or acetone to ultrasonically clean the stainless steel workpiece for more than 5 minutes to remove oil and impurities on the surface of the workpiece, and dry it for use;

[0031] (3) Pre-oxidize the stainless steel workpiece, the pre-oxidation temperature is 350°C; the holding time is 40min;

[0032] (4) After the stainless steel workpiece is cooled, put it into the ion nitriding furnace, pass in the dried hydrogen gas, then start to heat up, and when it reaches 500°C, pass in nitrogen gas, and adjust the ratio of nitrogen gas and hydrogen gas to 1: 3; Then start timing;

[0033] (5) After the holding time r...

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Abstract

The invention relates to a stainless steel ion nitriding process, and in particular relates to an austenitic stainless steel ion nitriding permeation catalyzing process. The process mainly comprises the following steps: 1) washing the surface of a stainless steel surface, and removing the oil stain and impurities on the surface of the workpiece; 2) carrying out pre-oxidation treatment on the stainless steel workpiece; 3) putting the stainless steel workpiece into an ion nitriding furnace after being cooled down, introducing dried hydrogen, building up of luminance and heating up, after reaching a certain temperature, introducing nitrogen, adjusting the ratio of the nitrogen to the hydrogen and the pressure in the furnace, subsequently starting to time, after nitriding for a certain time, closing the ion nitriding furnace and cooling down the workpiece along with the furnace. The austenitic stainless steel treated by using the process can obtain a compound layer which is thicker than that of an ordinary ion nitriding process.

Description

technical field [0001] The invention belongs to the technical field of metal surface modification, and in particular relates to an austenitic stainless steel ion nitriding catalytic infiltration process. Background technique [0002] Ion nitriding is an ion chemical heat treatment process that infiltrates nitrogen atoms into the metal surface to change the chemical composition and microstructure of the metal surface. After ion nitriding, a dense compound layer can be formed on the workpiece surface. This compound layer has high hardness and surface wear resistance, which can greatly improve the service life of metal workpieces, so it has been widely used. [0003] Due to the low surface hardness and poor wear resistance of austenitic stainless steel, the scope of use is greatly limited. At present, some studies have explored the application of ion nitriding to austenitic stainless steel to improve its surface hardness and wear resistance, and achieved good results. Since a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38
Inventor 胡静蔡伟王树凯李景才
Owner CHANGZHOU UNIV
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