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Preparation method of covered metal spare parts

A technology for covering structures and parts, which is applied in the field of preparation of metal parts of covering structures, can solve problems such as low bonding strength, pollute the environment, and consume large energy, and achieve the effect of high interface bonding strength

Inactive Publication Date: 2009-10-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bonding strength between the coating and the substrate of the coated parts is low (usually less than 30MPa), and the coating is very thin, which is easy to break and peel off under impact load
The surface treatment process takes a long time, consumes a lot of energy, and pollutes the environment; and the surface layer is very thin, which is easily worn or corroded by mechanical or chemical action under harsh conditions and scrapped

Method used

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  • Preparation method of covered metal spare parts
  • Preparation method of covered metal spare parts
  • Preparation method of covered metal spare parts

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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] a, preparation of raw material powder: the preparation of raw material powder of gear shell layer, by weight percentage, take iron powder 97, 96, 95%, Ni powder 2%, Cr powder 1, 2, 3%; the preparation of gear core layer raw material powder , by weight percentage, get iron powder 98%, Ni powder 2%, put four tank mixers, powder raw material is mixed evenly;

[0018] 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 at a temperature of 140°C-160°C;

[0019] c. Ingredients: mix the binder with the mixed Fe-2Ni raw material powder and Fe-2Ni-1, 2, 3Cr raw material powder respectively, and the core and shell layers are mixed according to the volume ratio of 38~60:62~40 respectively. Mix in the mac...

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Abstract

The invention discloses a preparation method of covered metal spare parts, comprising the steps of: mixing iron powder, nickel powder and chromium powder evenly for pelletization with adhesive; using powder co-injection formation process to form a housing layer part and a core layer part in turn by injection, wherein the feeding materials for two times of injection forming are different; and defatting and sintering the blank formed by injection to obtain the product. The invention provides the basic determination standard of the compatibility of co-sintering by measuring the difference of strain rate of sintering and provides the basic determination standard of the compatibility of co-injection by measuring the difference of viscosity of feeding materials to determine the compatibility determination standard of the covered metal spare part preparation process.

Description

technical field [0001] The invention relates to a preparation method of cladding structural metal parts. Background technique [0002] With the advancement of science and technology and the acceleration of innovation, the number of complex systems used in national defense and national economic construction is increasing. In addition to requiring complex shapes and high performance, many key metal parts involved also require parts to be made of multiple materials. Especially components with cladding structures. The surface layer and core layer of the cladding structure are composed of different materials. The surface layer and the core layer have different functions, such as the surface layer has high hardness and the core layer has high toughness, the surface layer has magnetic properties and the core layer has no magnetic properties, and the surface layer has high thermal conductivity while the core layer Low coefficient of thermal expansion, etc. Components for clad stru...

Claims

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Application Information

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IPC IPC(8): B23P15/00
Inventor 李益民何浩刘攀邓忠勇
Owner CENT SOUTH UNIV
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