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Pressurized gas nitrocarburizing method

A nitrocarburizing and pressurized gas technology, which is applied in coatings, metal material coating processes, solid-state diffusion coatings, etc. The effect of penetration depth, shortening of holding time and production cost

Inactive Publication Date: 2012-07-25
江南工业集团有限公司
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Problems solved by technology

In the background technology, the gas pressure is usually 300-1200Pa when gas nitrocarburizing is carried out on the surface of steel and other workpieces in China at present. Due to the low gas pressure in the furnace, its main disadvantage is that its co-infiltration holding time is long (usually 3 hours to 4 hours), and the penetration depth is affected and limited to a certain extent

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  • Pressurized gas nitrocarburizing method
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  • Pressurized gas nitrocarburizing method

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Embodiment Construction

[0010] A pressurized gas nitrocarburizing method, the process of which is: sealing and safety inspection → empty furnace heating → furnace loading → exhaust → pressurization and heating → heat preservation → cooling, by controlling the pressure and temperature in the furnace, Speed ​​up the nitrocarburizing speed and shorten the nitrocarburizing holding time.

[0011] Referring to the accompanying drawings, first of all, the sealing and safety inspection of the nitrocarburizing furnace must be carried out to check whether the furnace tank is leaking, whether the pressure relief safety valve 6 is intact, etc., to ensure the safety of the nitrocarburizing process when the gas is pressurized.

[0012] Before the workpiece is put into the furnace, the temperature of the empty furnace is raised, the temperature in the furnace is controlled not to exceed 400°C to 500°C, and the temperature is kept for 0.5 to 1 hour to make the temperature in the furnace uniform.

[0013] When loadin...

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Abstract

The invention relates to a pressurized gas nitrocarburizing method, belonging to the technical field of heat treatment of materials. The method is suitable for quickly nitrocarburizing on surface layers of steel workpieces, the main technical characteristic is that the method containing a procedure and the procedure comprises the following steps sequentially: sealing, checking safety, heating an empty furnace, charging, exhausting gas, pressurizing and heating, keeping heat and cooling. In the step of heating the empty furnace, the temperature in the furnace is controlled within 400 DEG C-500 DEG C, and the temperature of the empty furnace is kept for 0.5-1 hour; in the exhausting step, gas carbon dioxide and ammonia gas are respectively introduced in a gas inlet valve (2) and a gas inlet valve (3) to the inner bottom of a nitrocarburizing furnace through a gas inlet pipeline 1, and the air in the furnace is exhausted by a gas exhaust pipeline 7; in the pressurizing and heating step, the pressure is 5000Pa-60000Pa, the temperature is 500 DEG C-600 DEG C; and in the heat insulating step, and the heat insulation time is 1.5-3 hours. The invention has the advantages of simple technology, high nitrocarburizing speed and the like, can be used to obviously shorten the heat insulation time, effectively save the energy and the working hours, and reduce the production cost.

Description

technical field [0001] The invention relates to a pressurized gas nitrocarburizing method, which belongs to the technical field of material heat treatment, and is suitable for rapidly co-nitriding and carbonizing the surface of a steel workpiece to improve its surface performance. Background technique [0002] Gas nitrocarburizing is a chemical heat treatment process in which nitrogen and carbon are simultaneously infiltrated into the surface of steel workpieces, and nitriding is the main method. The purpose is to improve the surface wear resistance, corrosion resistance, and scratch resistance of steel workpieces and molds. Gas nitrocarburizing technology has been used more and more in automobiles, molds, weapons, aerospace and other products. In the background technology, the gas pressure is usually 300-1200Pa when gas nitrocarburizing is carried out on the surface of steel and other workpieces in China at present. Due to the low gas pressure in the furnace, its main disad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/30C23C8/32
Inventor 姚春臣刘赞辉彭德康李职模柴金万胡辉林肖宁
Owner 江南工业集团有限公司
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