A method to solve 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 increased anti-peeling strength and good bonding force

Active Publication Date: 2019-03-29
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 the gas in the cylinder also rises sharply, resulting in a rapid increase in the heat load of the piston that is in direct contact with the gas. As the temperature increases, the temperature of the piston also gradually increases, and the excessively high temperature reduces the strength of the piston material, which in turn reduces the high temperature strength and bearing capacity of the piston.

Method used

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  • A method to solve engine piston scuffing
  • A method to solve engine piston scuffing
  • A method to solve engine piston scuffing

Examples

Experimental program
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Effect test

Embodiment 1

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

[0037] S110: Perform surface cleaning at the pit and throat on the top of the piston.

[0038] In one example, metal ion beams are used to clean the surfaces of the pits and throats on the top of the piston to form a base layer. Preferabl...

Embodiment 2

[0047] Depositing Al in the pit and throat on the top of the piston 2 O 3 Insulation film. The implementation steps are as follows:

[0048] S110, preparation of metal cleaning layer 210

[0049] Al deposition: fixing the piston substrate 200 on the sample stage, rotating the sample to the deposition target position, and starting deposition, that is, cleaning the surface of the piston substrate 200 to obtain a metal cleaning layer 210. The deposition arc source is an Al arc source with a purity of 99%, and the deposition conditions are: vacuum 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 It is filtered at 90°.

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

[0051] Injection: rotate to the injection target to start injection, that is, inject metal ions on the metal cleaning layer 210 to obtain the metal "pinnin...

Embodiment 3

[0055] TiC-DLC insulation layer is deposited on the top of the piston and the throat. 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, and rotate the sample to the deposition target position to start deposition. The deposition arc source is a Ti arc source with a purity of 99%, and the deposition conditions are: vacuum 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 filter The pipe is filtered at 90°.

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

[0059] Injection: Turn to the injection target 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, injection voltage: 6-10kV, arc...

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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.

Description

Technical field [0001] The invention relates to the technical field of material surface modification, in particular to a method for solving engine piston pulling. Background technique [0002] The piston is called the "heart" of the internal combustion engine. It bears alternating mechanical and thermal loads. It is one of the key components in the internal combustion engine with the worst working conditions. It has special requirements for its materials: low thermal expansion coefficient, low density, and transmission. Good thermal conductivity, corrosion resistance and abrasion resistance. [0003] At present, domestic and foreign vehicle engines are developing in the direction of high speed and high power density. Among them, the power per unit of truck diesel engine has been increased by three times, and the power per unit of military vehicle diesel engine has increased at a higher speed. With the substantial strengthening of the internal combustion engine, the maximum explosi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/48C23C14/32C23C14/02C23C14/16C23C14/08C23C14/06F02F3/00F02F3/12
CPCC23C14/022C23C14/06C23C14/081C23C14/16C23C14/325C23C14/48F02F3/00F02F3/12
Inventor 廖斌欧阳晓平吴先映张旭韩然罗军
Owner BEIJING NORMAL UNIVERSITY
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