Vacuum high pressure pulse discharge catalyzed chemical heat treatment apparatus and method

A high-voltage pulse discharge and chemical heat treatment technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of slow heating speed of workpiece, different intensity of glow discharge, affecting the surface quality of workpiece, etc. Good surface quality, fast penetration and good wear resistance

Inactive Publication Date: 2006-03-01
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

Although the versatility is strong, there are still many shortcomings: ①The vacuum furnace body is all cooled by circulating water, and the cooling water takes away a lot of heat, which consumes a lot of energy
②Because the cooling water on the furnace wall takes away a lot of heat, the heating rate of the workpiece is slow
③ When processing slender

Method used

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  • Vacuum high pressure pulse discharge catalyzed chemical heat treatment apparatus and method

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Embodiment Construction

[0011] Put the workpiece in the furnace, and the built-in AC heater 14 directly heats the workpiece to the nitriding temperature. The output voltage of the pulse power supply is 6000 volts, which acts between the catalytic discharge electrode 6 and the catalytic discharge electrode 15 in the furnace to initiate and maintain strong gas ionization. discharge. The pressure in the furnace is 1100Pa, and the nitrogen-containing gas is violently ionized and discharged, which produces a large number of active infiltrated atoms, which penetrate into the workpiece at a high speed. The workpiece is not connected to the electrode, and the workpiece has no potential, so that the workpiece is not affected by ion bombardment and does not produce arcing. The nitriding gas enters the furnace through the gas supply ring pipe 3, and the external vacuum motor 1 is started. Under the action of the fan 2, the nitriding gas is guided through the heat shield 5 and the heat shield 12, from the upper p...

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Abstract

The present invention is vacuum high pressure pulse discharge catalyzed chemical heat treatment apparatus and method. The apparatus consists of furnace seat, catalytic discharge electrode on the furnace, catalytic discharge electrode, pulse power supply, furnace gas circulating system, heat isolating layer structure, inside AC heater, etc. The method includes setting the workpiece inside furnace, heating with the inside AC heater to nitriding temperature, applying pulse voltage of 0-8000 V between the catalytic discharge electrode on the furnace and the catalytic discharge electrode, ionizing the nitrogen containing gas inside the furnace and of pressure 100-50000 Pa to discharge intensively to generate active nitrogen atoms permeating into the workpiece at high speed, and circulating nitriding gas for passing by the workpiece homogeneously. The present invention has the advantages of fast nitriding, high heat efficiency, no oxidation of the workpiece, etc.

Description

Technical field [0001] The invention relates to the technical field of chemical heat treatment, in particular to a vacuum high voltage pulse discharge catalytic chemical heat treatment equipment and method Background technique [0002] The existing vacuum ion nitriding is a process that can improve the wear resistance, corrosion resistance, fatigue resistance, high temperature oxidation resistance and the service life of the workpiece on the metal surface. It usually puts the workpiece to be processed in a vacuum container, fills it with low-pressure nitrogen-containing gas, uses the workpiece as the cathode, and the wall cover of the vacuum container as the anode. After a sufficiently high DC voltage is applied between the cathode and the anode, the thin gas between the two electrodes is ionized, thereby generating a glow discharge. When the gas works in the abnormal glow discharge area, there are a lot of nitrogen positive ions and electrons in the furnace space, the posi...

Claims

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Application Information

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IPC IPC(8): C23C8/36C23C8/48
Inventor 刘世永
Owner DALIAN MARITIME UNIVERSITY
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