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Iron-based gradient structure gear and manufacturing method thereof

A gradient structure and gear technology, applied in the direction of belts/chains/gears, mechanical equipment, components with teeth, etc., can solve the problems of easy breaking and peeling, easy breaking, long carburizing time, etc., and achieve cost reduction and high integration intensity effect

Active Publication Date: 2011-10-05
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
  • 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 in conjunction with the accompanying 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 made of Fe2Ni, and the shell layer 2 is Fe-2Ni-1, 2, 3Cr.

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

[0019] a, the preparation of raw material powder: the preparation of gear shell raw material powder, by weight percentage, get iron powder 95%, Ni powder 2%, Cr powder 3%; The preparation of gear core layer raw material powder, by weight percentage, get iron powder 98%, Ni powder 2%, put four tank mixers, and mix the powder raw materials evenly;

[0020] B, preparation of binding agent: by weight percentage, get polyethylene glycol 10-40%, vegetable oil 5-20%, polyethylene 15-30%, plasticizer 1-10%, paraffin 15-54%, place In a blade mixer, mix for 1 hour ...

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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, and also relates to a preparation method of the iron-based gradient structure gear. Background technique [0002] In order to improve the wear resistance of iron-based gears, the existing technology is usually to carry out surface treatment such as coating or carburizing and nitriding. 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 im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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