Nitriding and carburizing method by thermal airflow jetting heating and squeezing

A technology of hot gas flow and nitriding, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of high cost, long cycle, large consumption, etc., to improve the precision of parts and reduce the carburizing temperature , The effect of reducing the amount of deformation of parts

Inactive Publication Date: 2014-11-05
SHANDONG UNIV
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Problems solved by technology

Obviously, this is an extremely difficult process. Therefore, traditional carburizing is a process with a long cycle, high cost and huge consumption.

Method used

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  • Nitriding and carburizing method by thermal airflow jetting heating and squeezing
  • Nitriding and carburizing method by thermal airflow jetting heating and squeezing

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing and technical scheme, take gear processing as example, the present invention is described in detail:

[0043] From the basic principles of material science and metallurgy, it can be known that through extrusion, the crystal lattice of metal materials is deformed, and a large number of vacancies, gaps, atomic loose regions, dislocations, dislocation barriers, and subgrain boundaries are generated inside the crystal. Crystal defects, these crystal defects are not only channels for nitrogen atoms to enter the permeated layer, but also a gravitational field will be generated around these defects to attract nitrogen atoms. This will be an important environment required for low temperature, rapid nitriding or carburizing.

[0044] The present invention is based on the above principles, such as figure 1 figure 2 As shown, a kind of extruding device is provided, and it comprises a sealing box 10, is provided with first rotating ...

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Abstract

The invention specifically discloses a nitriding and carburizing method by thermal airflow jetting heating and squeezing. The method comprises the following steps of: (1) cleaning up dirt on the surface of a component to be treated, by using gasoline, alcohol or acetone; (2) installing the cleaned component in a component box, and keeping the component to be treated in a squeezing and meshing state; (3) heating the component box to 300-500 DEG C simultaneously with filling anhydrous ammonia into the component box to exhaust the air from the box completely; and (4) starting a power mechanism of the component box to facilitate the component to do squeezing and meshing movement, and sustaining for 1-4 hours. According to the method disclosed by the invention, the utilization rate of the energy is greatly increased, the energy consumption is greatly reduced, the efficiency is greatly increased and the destruction on component precision caused by deformation is greatly reduced; and the method can be used for reducing the rejection rate to zero, greatly improving the quality and prolonging the service life, and can be used for realizing large-scale application of the nitriding and carburizing process, thereby entering a practical stage.

Description

technical field [0001] The invention relates to a hot air jet heating and extrusion nitriding and carburizing method. Background technique [0002] Nitriding is to place the steel piece in an active medium containing nitrogen, and at a certain temperature, nitrogen atoms penetrate into the surface of the steel piece, thereby forming a layer of nitrided layer structure to improve the hardness and durability of the layer. Chemical heat treatment process with various properties such as abrasiveness, corrosion resistance and fatigue strength. When nitriding, it is necessary to provide heat to the nitriding furnace to obtain active nitrogen atoms in the infiltrating agent and increase the vibration amplitude of metal crystal atoms in order to provide space and corresponding diffusion speed for nitrogen atoms [0003] The nitriding process mainly has the following advantages: 1. The treatment temperature is low. Ordinary nitriding is generally at 480°C-580°C. After nitriding, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/20C23C8/24
Inventor 崔建军万桂怡崔潇
Owner SHANDONG UNIV
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