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Wear-resistant coating for aluminum-based piston skirt and preparation method of wear-resistant coating

A wear-resistant coating and piston skirt technology, which is applied in the engine field, can solve problems such as piston skirt deformation, cylinder liner cavitation noise, and cylinder knocking, and achieve the effect of reducing the amount of use

Active Publication Date: 2021-11-02
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the working process of the piston, due to the second-order movement of the piston, the aluminum-based piston skirt is subject to a large side thrust and high temperature and high pressure thermal load, the piston skirt will be deformed, and there may be a local gap between it and the cylinder liner. If the gap is too large, it will cause knocking, increased oil consumption, cylinder liner cavitation or excessive noise; or after the skirt is deformed, it will be difficult to achieve lubrication, which will affect the reliability of the work.

Method used

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  • Wear-resistant coating for aluminum-based piston skirt and preparation method of wear-resistant coating
  • Wear-resistant coating for aluminum-based piston skirt and preparation method of wear-resistant coating
  • Wear-resistant coating for aluminum-based piston skirt and preparation method of wear-resistant coating

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preparation example Construction

[0070] Further, in some embodiments, the preparation method of carbon fiber reinforced graphite wear-resistant coating comprises the following steps:

[0071] Step 1, attaching magnetic particles on the surface of carbon fibers to obtain magnetic carbon fibers. This section further includes the following subdivision steps:

[0072] Step 1.1, sonicate the carbon fibers in an acid solution; filter with suction, wash with deionized water, and repeat for several times until the filtrate is neutral; in this way, acid-washed carbon fibers are obtained. The acid solution is obtained by mixing nitric acid and sulfuric acid at a mass ratio of 1:1 to 3:2.

[0073] Step 1.2, fully mix the acid-washed carbon fiber with the iron ion solution, and then add the alkaline solution dropwise into the iron ion solution until a large amount of precipitation occurs, and let it stand still. The iron ion solution is a mixed solution of ferric chloride solution and ferrous chloride solution, wherein...

Embodiment 1

[0079] Surface treatment of aluminum base piston skirt: figure 1 It is a top-view structure schematic diagram of the wear-resistant structure in this embodiment 1; the piston surface is distributed with virtual regular hexagons, and the apex is provided with a first circular protrusion 11, a second circular protrusion 12, and a third circular protrusion 13 , the fourth round protrusion 14 , the fifth round protrusion 15 , and the sixth round protrusion 16 . attached figure 2 It is a three-dimensional structural diagram of the wear-resistant structure in Example 1, wherein the first circular protrusion 11, the second circular protrusion 12, the third circular protrusion 13, the fourth circular protrusion 14, the fifth circular protrusion The concave part 20 is surrounded by the shaped protrusion 15 and the sixth circular protrusion 16 . In Example 1, the wear-resistant structure protrudes from the surface of the metal substrate, and in principle belongs to the above-mentione...

Embodiment 2

[0091] The difference between this embodiment 2 and embodiment 1 is that the preparation method of the magnetic carbon fiber and the thickness of the carbon fiber part after sintering are different, which are specifically reflected in:

[0092] Ultrasonic treatment of carbon fibers in an acid solution with a mixing ratio of nitric acid and sulfuric acid of 1:1; suction filtration, washing with deionized water, and repeating several times until the filtrate is neutral to obtain acid-washed carbon fibers; Fully mix the carbon fiber with ferric chloride solution and ferrous chloride solution with a volume ratio of 2:1, and then keep the temperature of the ferric ion solution at 80-90°C, add alkaline solution dropwise until a large amount of precipitation occurs, and statically Place; remove the upper liquid, suction filter the lower precipitate, wash with deionized water, and repeat until the filtrate is neutral.

[0093] The amount of magnetic carbon fiber is such that the thick...

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Abstract

The invention provides a wear-resistant coating for an aluminum-based piston skirt and a preparation method of the wear-resistant coating. The wear-resistant coating contains carbon fibers, and the carbon fibers are distributed on the surface of the wear-resistant coating and the interior close to the surface of the wear-resistant coating. The preparation method of the wear-resistant coating comprises the following steps: step 1, adding magnetic particles on the surface of the carbon fibers to obtain magnetic carbon fiber; step 2, adding magnetic carbon fibers into graphite, fully and uniformly conducting mixing, and then coating a piston skirt part with the mixture to form a coating precursor; step 3, applying a magnetic field to the outer side of the piston skirt, so as to enable the magnetic carbon fibers to migrate to the surface of the coating precursor and the interior close to the surface and to be enriched; and step 4, sintering and curing the graphite under the protection of inert gas, and solidifying the carbon fibers in the graphite. The wear-resistant coating has the beneficial effects that the carbon fibers are added into the graphite coating, and the carbon fibers are enriched on the surface of the coating and the interior close to the surface, so that the wear resistance of the graphite coating is enhanced by the carbon fibers, and the service life of the piston can be remarkably prolonged.

Description

technical field [0001] The invention belongs to the technical field of engines and relates to a piston skirt of an internal combustion engine, in particular to a wear-resistant coating for an aluminum-based piston skirt and a preparation method thereof. Background technique [0002] Aluminum-based pistons generally refer to aluminum alloy pistons or aluminum-based composite pistons. Such pistons are one of the key components of the engine. The piston skirt plays the role of guiding, bearing side pressure and heat transfer in the cylinder. During the working process of the piston, due to the second-order movement of the piston, the aluminum-based piston skirt is subject to a large side thrust and high temperature and high pressure thermal load, the piston skirt will be deformed, and there may be a local gap between it and the cylinder liner. , resulting in cylinder seizure and cylinder scuffing; or if the gap is too large, such phenomena as cylinder knocking, increased oil co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00D06M11/64D06M11/55D06M11/28C23C26/00D06M101/40
CPCC09D1/00D06M11/64D06M11/55D06M11/28C23C26/00D06M2101/40
Inventor 王浩伟汪明亮陈东夏存娟吴一王鹏举
Owner SHANGHAI JIAO TONG UNIV