Method for solving engine piston scuffing

A technology for engines and pistons, which is applied in the field of material surface modification, which can solve problems such as temperature rise, piston heat load increase, piston high-temperature strength and load-bearing capacity reduction, etc., and achieve the effect of good bonding force and enhanced peel strength

CN106435506AActive Publication Date: 2017-02-22BEIJING NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-02-22

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Abstract

The invention relates to a method for solving engine piston scuffing. Heat insulation film layers are deposited on a pit and a throat in the top of a piston, and are used for preventing conducting of heat of a combustion chamber to key components below the piston, and the piston scuffing problem is solved; according to one embodiment, the heat insulation film layers are deposited on the pit and the throat in the top of the piston, wherein the pit and the throat of the top of the piston are subject to surface cleaning; metal elements are injected into the pit and the throat of the top of the piston subject to surface cleaning, and a metal pinning layer is formed; the heat insulation film layers are deposited on the metal pinning layer. According to the heat insulation film layers prepared through the method, the obvious heat isolation effect is achieved, heat conduction of the relative high temperature of the combustion chamber to the key components below the top of the piston is obstructed, the heat expansion amount is obviously reduced, and meanwhile various problems caused by inconsistency of expansion coefficients can be directly solved.
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Description

technical field

[0001] The invention relates to the technical field of material surface modification, in particular to a method for solving engine piston scuffing. Background technique

[0002] The piston is called the "heart" of the internal combustion engine. It bears alternating mechanical loads and thermal loads. It is one of the key components in the internal combustion engine with the worst working conditions. Good thermal conductivity, corrosion resistance and wear resistance, etc.

[0003] At present, vehicle engines at home and abroad are developing in the direction of high speed and high power density. Among them, the power per liter of diesel engines for trucks has increased by three times, and the power per liter of diesel engines for military vehicles has increased at a higher speed. With the strengthening of the internal combustion engine, the maximum explosion pressure of the gas in the cylinder gradually increases, and at the same time, the temperature of th...

Examples

Embodiment 1

[0036] In order to solve the problem of piston scuffing in the current engine, this embodiment provides a method to solve the problem of engine piston scuffing, depositing an insulating film on the pit and throat on the top of the piston to prevent the heat of the combustion chamber from going down to the piston. The conduction of key components solves the problem of piston scuffing. figure 1 A schematic flow chart of depositing a thermal insulation film layer at the top pit and throat of the piston provided by the embodiment of the present invention, figure 2 It is a schematic diagram of the structure of the heat insulating film layer provided by the embodiment of the present invention. Such as figure 1 As shown, the method includes:

[0037] S110, perform surface cleaning on the pit and throat on the top of the piston.

[0038] In one example, metal ion beams are used to clean the surface of the piston top pit and throat to form a base layer. Preferably, a magnetic filt...

Embodiment 2

[0047] Deposit Al on piston top pit and throat 2 o 3 Insulation film layer. The implementation steps are as follows:

[0048] S110, preparation of metal cleaning layer 210

[0049] Al deposition: fix the piston base material 200 on the sample stage, rotate the sample to the deposition target position, and start deposition, that is, clean the surface of the piston base material 200 to obtain the metal cleaning layer 210 . The deposition arc source is an Al arc source with a purity of 99%, and the deposition conditions are: vacuum degree 1×10 -3 -6×10 -3 Pa, deposition arc current: 100-120A, magnetic field current: 1.4-2.4A, arc current: 380-440mA, negative pressure: 400V-1000V, duty cycle 50%-100%, deposition time 3-60S, magnetic filter pipeline Filtered at 90°.

[0050] S120, preparation of metal "pinning layer" 220:

[0051] Implantation: Rotate to the implantation target position to start implantation, that is, implant metal ions on the metal cleaning layer 210 to obt...

Embodiment 3

[0055] Deposit TiC-DLC thermal insulation layer on the top pit and throat of the piston. The implementation steps are as follows:

[0056] S110, preparation of metal cleaning layer 210:

[0057] Ti deposition: fix the piston substrate 200 on the sample stage, rotate the sample to the deposition target position and start deposition. The deposition arc source is a Ti arc source with a purity of 99%, and the deposition conditions are: vacuum degree 1×10 -3 -6×10 -3 Pa, deposition arc current: 100-110A, magnetic field current: 1.4-2.4A, arc current: 380-440mA, negative pressure: -400V-1000V, duty cycle 50%-100%, deposition time 3-60S, magnetic filtration The piping is 90° filtered.

[0058] S120, preparation of metal "pinning layer" 220:

[0059] Injection: Turn to the injection target position to start injection. The implanted ion source is pure Ti with a purity of 99.9%, and the implantation conditions are: vacuum degree 1×10 -3 -6×10 -3 Pa, injection arc voltage: 50-70V...