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Iron-based gradient structure gear and manufacturing method thereof

A gradient structure, iron-based technology, applied in the direction of belts/chains/gears, mechanical equipment, components with teeth, etc., can solve the problems of easy breakage and peeling, easy breakage, low bonding strength of coating and substrate, etc., to reduce The effect of low cost and high bonding strength

Active Publication Date: 2009-10-14
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

The carburized layer obtained by the gear carburizing process always has an oxidized decarburized layer, and the carburizing time is long, the energy consumption is large, and the environment is polluted; the nitrided hardened layer obtained by the nitriding process is very thin, and it is easy to break and wear under impact load. In severe cases, it will be scrapped because the hardened layer is worn off
The bonding strength of the coating and the substrate in the coating process is low (usually less than 30MPa), and the coating is very thin and easy to break and peel off under impact load
None of the existing gear surface treatment processes can meet the uniform requirements of cost and performance in use

Method used

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  • Iron-based gradient structure gear and manufacturing method thereof

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Embodiment Construction

[0016] The present invention will be described in detail below with reference to the drawings and embodiments.

[0017] See figure 1 The outer layer of the core layer 1 is covered with a shell layer 2. The shell layer 2 and the core layer 1 are combined by metallurgy, the core layer 1 is Fe 2Ni, and the shell layer 2 is Fe-2Ni-1, 2, 3Cr.

[0018] The steps of the preparation method are as follows:

[0019] a. Preparation of raw material powder: The gear shell material powder is prepared by weight percentage, taking iron powder 95%, Ni powder 2%, and Cr powder 3%; for gear core material powder preparation, taking iron powder by weight percentage 98%, Ni powder 2%, set a four-pot mixer to mix the powder raw materials evenly;

[0020] b. Preparation of binder: take polyethylene glycol 10-40%, vegetable oil 5-20%, polyethylene 15-30%, plasticizer 1-10%, and paraffin 15-54% by weight. In the blade mixer, mix at 140℃-160 for 1 hour;

[0021] c. Ingredients: the binder and the mixed Fe-2...

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Abstract

The invention discloses an iron-based gradient structure gear and a manufacturing method thereof; to realized high surface layer hardness and high core / shell layer bonding strength, Fe2Ni is adopted as a core layer and the Fe2Ni added with an alloying element Cr is adopted as a shell layer; through strengthening effect of Cr, sintering / heat treatment is adopted to facilitate surface layer hardness to exceed 40 HRC and realize the metallurgical bonding of the core layer and the shell layer; sintering time is adjusted to realized homogeneous diffusion of Cr outside the interface and core / shell layer bonding strength is higher than 280 MPa.

Description

Technical field [0001] The invention relates to a gear, in particular to an iron-based gradient structure gear. The invention also relates to a method for preparing the iron-based gradient structure gear. Background technique [0002] In order to improve the wear resistance of iron-based gears, the existing technology usually applies surface treatments such as coating or carburizing and nitriding. The carburized layer obtained by the gear carburizing process always has an oxidative decarburization layer, and the carburizing time is long, energy consumption is large, and the environment is polluted; the nitriding hardened layer obtained by the nitriding process is very thin, and it is easy to break and wear under impact load In severe cases, the hardened layer will be worn away and scrapped. The bonding strength of the coating and the substrate of the coating process is low (usually less than 30MPa), and the coating is very thin and easily breaks and peels under impact load. None ...

Claims

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Application Information

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IPC IPC(8): F16H55/17B22F5/08
Inventor 李益民何浩张建光唐嵘
Owner CENT SOUTH UNIV
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