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Preparation method of wear-resistant coating on surface of aluminum alloy engine cylinder hole

A technology of engine cylinder and wear-resistant coating, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of connection performance degradation, shortened service time, and different degrees of thermal deformation, so as to improve the wear condition , the friction coefficient is reduced, and the effect of light weight

Pending Publication Date: 2021-10-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a method for preparing a wear-resistant coating on the surface of the cylinder bore of an aluminum alloy engine to solve the problem that the aluminum alloy cylinder block is inlaid with the cast iron cylinder liner at present. The degree of thermal deformation between them is different, which leads to the decrease of connection performance and the shortening of service time.

Method used

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  • Preparation method of wear-resistant coating on surface of aluminum alloy engine cylinder hole
  • Preparation method of wear-resistant coating on surface of aluminum alloy engine cylinder hole
  • Preparation method of wear-resistant coating on surface of aluminum alloy engine cylinder hole

Examples

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Embodiment 1

[0033] A method for preparing an aluminum alloy engine cylinder hole surface wear-resistant coating, comprising the following steps:

[0034] Step 1: After degreasing and cleaning the inner hole of the engine cylinder, perform sandblasting treatment. The base of the engine cylinder is aluminum alloy.

[0035] Step 2: Prepare Fe-based alloy powder, and 24% Cr powder and 8% Mo powder, wherein the mass ratio of Cr powder and Mo powder is 3:1.

[0036] The composition list of Fe-based alloy powder in the present embodiment 1 (according to mass proportion):

[0037]

[0038] The particle size range of Fe-based alloy powder, Cr powder and Mo powder is between 30-55 μm, and the above-mentioned powders are all spherical powders. Put the above-mentioned powders into a ball mill and mill them for 3 hours. The ball-milling medium is absolute ethanol, and the powders are mixed evenly Finally, the mixed powder was dried in a drying oven at 60° C. for 1 h, so that the absolute ethanol i...

Embodiment 2～ Embodiment 4

[0043] The difference from Example 1 is that in Examples 2 to 4, the mass proportions of raw materials are different, as shown in Table 3 below.

[0044] Table 3 is the table of raw materials used for coating in embodiment 2~embodiment 4

[0045]

Embodiment 5

[0047] The difference from Example 1 is that the spraying parameters in Step 2 of Example 5 are different, as shown in Table 4 below.

[0048] Table 4 is the spraying parameter table in embodiment 5 step 2

[0049]

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Abstract

The invention belongs to the technical field of wear-resistant coatings of engines, and particularly discloses a preparation method of a wear-resistant coating on the surface of an aluminum alloy engine cylinder hole. The preparation method comprises the following steps that step 1, Fe-based alloy powder, Cr powder and Mo powder are uniformly mixed; the mass ratio of the Cr powder is 15%-24%, and the mass ratio of the Mo powder is 5%-8%; and step 2, the powder uniformly mixed in the step (1) is sprayed on the hole wall of an inner hole of an air cylinder with an aluminum alloy base body by adopting a plasma spraying technology to form the wear-resistant coating. According to the scheme, the wear-resistant coating is sprayed on the inner wall of the air cylinder through the plasma spraying technology, so that the wear-resistant coating and the inner wall of the engine cylinder hole are metallurgically bonded, compared with mechanical bonding, the bonding force is higher, and the coating cannot be separated from the inner wall of the cylinder hole in the long-time service process.

Description

technical field [0001] The invention belongs to the technical field of engine wear-resistant coatings, and in particular relates to a preparation method of an aluminum alloy engine cylinder bore surface wear-resistant coating. Background technique [0002] The entire cylinder of a traditional engine is formed by die-casting of cast iron; although the cylinder formed by die-casting cast iron has good high-pressure resistance and wear resistance, but at the same time it also makes the mass of the cylinder large, the heat dissipation performance is not good, and the overall size of the casting is large. The shape is complex, and it is difficult to control the shrinkage and shrinkage during the die-casting process, which may easily cause insufficient pouring of the casting and produce defects such as cold shut. [0003] In recent years, in the process of promoting the lightweight of automobiles, the use of aluminum alloy materials to replace traditional cast iron materials has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/067C22C38/02C22C38/04C22C38/18B22F1/00B22F9/04C23C4/02
CPCC23C4/134C23C4/067C22C38/02C22C38/04C22C38/18B22F9/04C23C4/02B22F2009/043
Inventor 黄太红吴敏萱宋鹏雷基林邓伟杨晋陈榕吕建国郑必举
Owner KUNMING UNIV OF SCI & TECH
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