Unlock instant, AI-driven research and patent intelligence for your innovation.

A wear-resistant coating for aluminum-based piston skirt and its preparation method

A wear-resistant coating and piston skirt technology, applied in the field of engines, can solve the problems of piston skirt deformation, affecting work reliability, cavitation noise of cylinder liner, etc., and achieve the effect of reducing dosage

Active Publication Date: 2022-04-26
SHANGHAI JIAOTONG UNIV +1
View PDF11 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A wear-resistant coating for aluminum-based piston skirt and its preparation method
  • A wear-resistant coating for aluminum-based piston skirt and its preparation method
  • A wear-resistant coating for aluminum-based piston skirt and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

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, 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 thickness...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a wear-resistant coating for an aluminum-based piston skirt and a preparation method thereof. The wear-resistant coating contains carbon fibers, and the carbon fibers are distributed on the surface of the wear-resistant coating and inside close to the surface. The preparation method of the above-mentioned wear-resistant coating comprises the following steps: step 1, attaching magnetic particles on the surface of carbon fibers to obtain magnetic carbon fibers; step 2, adding magnetic carbon fibers to graphite, fully mixing and coating on the piston skirt to form a coating layer precursor; step 3, applying a magnetic field outside the piston skirt, so that the magnetic carbon fibers migrate and enrich to the surface of the coating precursor and the interior close to the surface; step 4, under the protection of an inert gas, the graphite is sintered and solidified, The carbon fibers in it are consolidated. Beneficial effects of the invention: adding carbon fiber to the graphite coating, and enriching the carbon fiber on the surface of the coating and the interior close to the surface, the carbon fiber enhances the wear resistance of the graphite coating, and can significantly increase the service life of the piston.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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 JIAOTONG UNIV