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A kind of preparation method of wear-resistant coating on the surface of ductile iron

A technology of nodular cast iron and wear-resistant coating, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc. Solve the effect of low bonding strength, good bonding force and improving wear resistance

Active Publication Date: 2020-06-09
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a method for preparing a wear-resistant coating on the surface of ductile iron, which combines aluminizing treatment with high-temperature oxidation treatment, and can solve the problem of wear-resistant layer and substrate. The bonding strength is not high, and it is difficult to prepare a coating for a small workpiece with an inner wall

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  • A kind of preparation method of wear-resistant coating on the surface of ductile iron

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[0022] The preparation method (abbreviation method) of wear-resistant coating on the surface of ductile iron of the present invention comprises the following steps:

[0023] The first step is to carry out aluminizing treatment on the ductile iron workpiece, and obtain an aluminized workpiece after cooling. The aluminizing temperature is 780-850 ° C, and the temperature is kept at this temperature for 2-5 hours;

[0024] In the second step, the aluminized workpiece obtained in the first step is subjected to high-temperature oxidation treatment, and the high-temperature oxidation temperature is 900-1000° C., and kept at this temperature for 2-5 hours.

[0025] The method of the present invention is further characterized in that the mass percentage of the aluminizing agent used in the aluminizing treatment is composed of: aluminum powder 20-30%; ammonium chloride 1-3%; graphite 2-5%; cerium oxide 1-3% %; the balance of alumina.

[0026] The further feature of the method of the p...

Embodiment 1

[0029] figure 1 It is a schematic flow chart of a method for preparing a wear-resistant coating on the surface of a nodular cast iron provided in Example 1 of the present invention. This embodiment is applicable to the case where a wear-resistant coating is prepared on the surface of a nodular cast iron workpiece, and aluminized treatment is performed on the nodular cast iron workpiece , to obtain an aluminized workpiece, and perform high-temperature oxidation treatment on the obtained aluminized workpiece. Such as figure 1 As shown, the technical solution provided by this embodiment is specifically as follows:

[0030] S110, performing aluminizing treatment on the nodular cast iron workpiece, and obtaining an aluminized workpiece after cooling.

[0031] Exemplarily, nodular cast iron has a wide range of applications in automobiles, such as gears, bushings, brakes, etc., and this embodiment uses a valve guide as an example for illustration. Specifically, the aluminizing tre...

Embodiment 2

[0038] The preparation method of the wear-resistant coating on the surface of ductile iron of the present embodiment, the method comprises the following steps:

[0039] The first step, aluminizing treatment: in the aluminizing tank, the ductile iron workpiece is coated with an aluminizing agent; after sealing, the temperature is raised to the first preset temperature, and the temperature is kept for the first preset time, and the first preset The temperature is 780-850° C., the first preset time is 2-5 hours, and an aluminized workpiece is obtained after cooling.

[0040] Exemplarily, the ductile iron workpiece in this embodiment is described by taking the valve guide as an example. The first preset temperature refers to the temperature to which the aluminized tank is heated during the aluminizing process, which is 780-850°C. When heated at this temperature, the aluminizing agent reacts to generate active Al atoms, active Al atoms and matrix Diffusion of Fe atoms in the valve...

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Abstract

The invention relates to a preparation method of surface wear-resistant coating for nodular cast iron. The preparation method comprises the following steps: 1, performing aluminizing treatment on a nodular cast iron workpiece, and cooling to obtain an aluminized workpiece, wherein the aluminizing temperature is 780-850 DEG C and heat is preserved for 2-5h at the temperature; 2, performing high-temperature oxidation treatment to the aluminized workpiece obtained in the step 1, wherein the high-temperature oxidation temperature is 900-1000 DEG C and heat is preserved for 2-5h at the temperature.By the preparation method combining the aluminizing treatment and the high-temperature oxidation treatment, the problems that the bonding strength between a wear-resistant layer and a substrate is low and preparation of coating for a workpiece with relatively small volume and having an inner wall is difficult can be solved.

Description

technical field [0001] The embodiments of the present invention relate to the field of protective coatings, in particular to a method for preparing a wear-resistant coating on the surface of nodular cast iron. Background technique [0002] With the high-speed development of traffic, the requirements for the wear resistance of automobile engine accessories are constantly increasing. Ductile iron has high strength, good thermal conductivity, shock absorption, and high wear resistance, and is widely used in engine accessories systems, usually for engine valve guides. [0003] In the prior art, since the relative movement between the guide tube and the valve stem is non-lubricated and the operating temperature is high, the wear of the valve guide is very severe. In order to improve the service life of the workpiece, it is necessary to improve the wear resistance of the valve guide. At present, the method of preparing wear-resistant coating on the surface of ductile iron is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/50C23C10/60
Inventor 范永哲魏放杜安马瑞娜赵雪曹晓明
Owner HEBEI UNIV OF TECH
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