Method for inducing nodular cast iron to synthesize graphene in situ

A ductile iron, in-situ self-generating technology, applied in the field of material modification, can solve the problems of complex process and low bonding strength, and achieve the effects of controllable process, improved thermal conductivity and simple method

Inactive Publication Date: 2018-11-13
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a solution for the problem that ductile iron components need to take into account the wear resistance, corrosion resistance and heat dissipation performance at the same time, and the performance improvement technology of existing ductile iron components has defects such as low bonding strength and complicated process. Method for inducing in situ self-generated graphene in ductile iron to improve thermal conductivity, mechanical properties and corrosion resistance of ductile iron components

Method used

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  • Method for inducing nodular cast iron to synthesize graphene in situ
  • Method for inducing nodular cast iron to synthesize graphene in situ
  • Method for inducing nodular cast iron to synthesize graphene in situ

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 , 2 As shown, the base material of the nodular cast iron component is cuboid nodular cast iron with the grade QT500, first clean the QT500 nodular cast iron cuboid base material 1, and clean and dry the surface. In view of the fact that the ductile iron itself contains freely movable electrons, the spherical graphite 2 in the ductile iron cuboid substrate 1 also contains freely movable electrons in its carbon atom sheet 5, so applying a power source makes the freely movable electrons become directionally moving. Carriers, forming a clockwise current 3 along the circumference of the substrate surface, the current size is 3A, such as figure 1 shown.

[0033] Under the condition that the clockwise current direction remains unchanged, the magnitude of the current is rapidly reduced to 1A, and the rate of change of the rapid reduction of the current is 100A / s. According to Lenz's law, the change of the magnitude of the current will stimulate the cross-sect...

Embodiment 2

[0036] Such as image 3 , 4As shown, the base material of the ductile iron component is cylindrical ductile iron with the grade QT600. Clean the QT600 ductile iron cylinder substrate 8, and clean and dry the surface. In view of the fact that nodular cast iron itself contains freely movable electrons, the carbon atom sheets 12 of spherical graphite 9 in the matrix also contain freely movable electrons, so the application of power makes the freely movable electrons become directional carriers, forming The current 10 counterclockwise along the circumference of the substrate, the magnitude of the current is 5A, such as image 3 shown.

[0037] Under the condition that the counterclockwise current direction remains unchanged, the magnitude of the current is rapidly reduced to 1A, and the rate of change is 200A / s. According to Lenz’s law, the change of the magnitude of the current will excite the vertical force that runs through the cross-section of the ductile iron cylinder subs...

Embodiment 3

[0039] Such as Figure 5 , 6 , 7, the base material of the nodular cast iron component is the conical nodular cast iron with the grade QT400. Clean the QT400 ductile iron cone substrate 15, and clean and dry the surface. In view of the fact that nodular cast iron itself contains freely movable electrons, the carbon atom sheets 20 of spherical graphite 16 in the matrix also contain freely movable electrons, so the application of power makes the freely movable electrons become directional carriers, forming The current 17 in the counterclockwise direction along the circumference of the substrate, the magnitude of the current 17 is 5A, such as Figure 5 shown.

[0040] Under the condition that the magnitude of the current is constant, change the direction of the current rapidly, so that the direction of the current 17 becomes clockwise, and then becomes the clockwise current 18. The time for the change of the current direction is 0.05s. According to Lenz’s law, the direction of...

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Abstract

The invention discloses a method for inducing nodular cast iron to synthesize graphene in situ, wherein the method is applied to the technical field of material modification. The method comprises thesteps that a power source is applied to a nodular cast iron base material, so that electrons moving freely are changed into current carriers moving in an oriented manner, and a circumferential currentmoving around the base material is formed; the magnitude or direction of the circumferential current is changed so that a magnetic field which perpendicularly penetrates the surface of the nodular cast iron base material can be excited; and a carbon atom sheet layer of spheroidal graphite in the nodular cast iron base material is subjected to the effect of the Ampere force pointing to the outer surface of the base material, the carbon atom sheet layer peels, and the graphene is synthesized in situ. According to the method, the internal structure that the spheroidal graphite carbon atom sheetlayer in the nodular cast iron base material is distributed in the radial direction in a layered manner is fully utilized, and the graphene is synthesized in situ based on the effects of the electricfield and the magnetic field; the process is controllable; integrity of the surface of the base body is effectively guaranteed; and performance of a nodular cast iron component is improved at the sametime through in-situ synthesis of the graphene.

Description

technical field [0001] The invention belongs to the technical field of material modification, and specifically relates to a method for inducing in-situ self-generated graphene in ductile iron to significantly improve the thermal conductivity, mechanical properties and corrosion resistance of ductile iron components. Background technique [0002] Due to its good wear resistance, shock absorption, excellent cutting performance and casting performance, ductile iron is widely used in the manufacture of components with heavy load and complex stress, such as crankshafts, transmission gears, camshafts, and cylinder blocks. / cover and brake disc etc. According to different working conditions, the contact interface of cast iron components needs to have good mechanical properties and stable chemical properties to improve wear resistance and corrosion resistance. Moreover, due to the cyclic loading of mechanical stress and frictional heat generation during service, the temperature of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/04C21D5/00
CPCC21D1/04C21D5/00
Inventor 冯旭杨帆朱桐张洁徐雨辉
Owner JIANGSU UNIV
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