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Piston with Ti-doping diamond multi-layer thick heat-insulating film on top face and preparation method and application of piston

A multi-layer heat insulation and titanium doping technology, which is applied in the direction of piston, metal material coating process, coating, etc., can solve the limitations of DLC film application and development, poor thermal stability, poor bonding force between the film layer and the substrate interface And other issues

Active Publication Date: 2017-07-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high internal stress makes the interfacial bonding between the film layer and the substrate poor, and its poor thermal stability limits the application and development of DLC films.

Method used

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  • Piston with Ti-doping diamond multi-layer thick heat-insulating film on top face and preparation method and application of piston
  • Piston with Ti-doping diamond multi-layer thick heat-insulating film on top face and preparation method and application of piston
  • Piston with Ti-doping diamond multi-layer thick heat-insulating film on top face and preparation method and application of piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] (a) Using the FCVA system, turn on the titanium power supply arc, adjust the arcing current to 100A, the magnetic field of the curved pipe is 2.0A, the magnetic field of the straight pipe is 3.5A, the duty cycle is 90%, and the negative pressure is -1000V, -800V, - 600V, -400V, -300V, deposit a Ti film layer on the surface of the pretreated substrate, where each negative pressure point is deposited for 30s, and when the negative pressure is -300V, deposit for 20 minutes;

[0075] (b) Turn on the titanium arc source, adjust the duty cycle to 20%, and open the gas flow switch to feed acetylene gas at the same time. The acetylene flow sequence adopts 10sccm, 20sccm, 30sccm, 40sccm, 50sccm, 60sccm, 70sccm, 80sccm deposition, each flow Spot deposition for 30s, when the acetylene flow rate is 80sccm, deposit for 15min to obtain TiC / DLC film layer;

[0076] (c) Turn on the titanium arc source, adjust the duty cycle to 90%, turn off the gas flow switch, and deposit for 3 minute...

Embodiment 2

[0082] (a) Using the FCVA system, turn on the titanium power supply arc, adjust the arcing current to 100A, the magnetic field of the curved pipe to 2.0A, the magnetic field of the straight pipe to 3.5A, the duty cycle is 90%, and the negative pressure is -1000V, -800V, -600V in sequence , -400V, -300V, deposit a Ti film layer on the surface of the pretreated substrate, where each negative pressure point is deposited for 30s, and when the negative pressure is -300V, deposit for 20min;

[0083] (b) Turn on the titanium arc source, adjust the duty cycle to 20%, and open the gas flow switch to feed acetylene gas at the same time. The acetylene flow sequence adopts 10sccm, 20sccm, 30sccm, 40sccm, 50sccm, 60sccm, 70sccm, 80sccm deposition, each flow Spot deposition for 30s, when the flow rate of acetylene is 80sccm, deposition for 22.5min / 16.25min / 10min, TiC / DLC film layer is obtained;

[0084] (c) Turn on the titanium arc source, adjust the duty cycle to 90%, turn off the gas flow...

Embodiment 3

[0088] (a) Using the FCVA system, turn on the titanium power supply arc, adjust the arcing current to 100A, the magnetic field of the curved pipe to 2.0A, the magnetic field of the straight pipe to 3.5A, the duty cycle is 90%, and the negative pressure is -1000V, -800V, -600V in sequence , -400V, -300V, deposit a Ti film layer on the surface of the pretreated substrate, where each negative pressure point is deposited for 30s, and when the negative pressure is -300V, deposit for 10min;

[0089] (b) Turn on the titanium arc source, adjust the duty cycle to 20%, and open the gas flow switch to feed acetylene gas at the same time. The acetylene flow sequence adopts 10sccm, 20sccm, 30sccm, 40sccm, 50sccm, 60sccm, 70sccm, 80sccm deposition, each flow Spot deposition for 30s, when the acetylene flow rate is 80sccm, deposit for 10min to obtain TiC / DLC film layer;

[0090] (c) Turn on the titanium arc source, adjust the duty cycle to 90%, turn off the gas flow switch, and deposit for 3...

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Abstract

The invention relates to a piston with a Ti-doping diamond multi-layer thick heat-insulating film on the top face and a preparation method and application of the piston. The piston comprises a piston substrate, a transitional layer, n layers of TiC / DLC film layers and m buffer layers, wherein the outermost layer of the top face of the piston is the last TiC / DLC film layer. According to the preparation method of the piston, the transitional layer is prepared on the top face of the piston substrate; then the first TiC / DLC film layer is prepared; one buffer layer is formed on the first TiC / DLC film layer; the TiC / DLC film layers and the buffer layers are formed alternately, so that a middle layer is obtained, and then the last TiC / DLC film layer is prepared. According to the piston with the Ti-doping diamond multi-layer thick heat-insulating film on the top face has excellent abrasion resistance and thermal impact resistance and can meet the requirement of modern engines for high efficiency and low emission.

Description

technical field [0001] The invention relates to a piston whose top surface is a titanium-doped diamond-like multilayer heat-insulating thick film and its preparation method and application, belonging to the technical field of piston design and preparation. Background technique [0002] As we all know, the piston is the "heart" of the internal combustion engine, and the reliability of its work directly determines a series of important performances such as the reliability, durability, economy and emission of the engine car. However, as one of the key parts of the engine, it is in a harsh environment of high temperature, high pressure, and high load, and is subject to periodic alternating mechanical and thermal loads, which is prone to thermal load failure, thermal fatigue failure, thermal corrosion failure, and high cycle fatigue damage. , Low cycle fatigue damage. As a part of the piston, the top surface of the piston has a particularly complex working environment: First, th...

Claims

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Application Information

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IPC IPC(8): C23C14/32C23C14/16C23C14/18C23C14/06F02F3/10
CPCC23C14/0021C23C14/0605C23C14/0635C23C14/16C23C14/18C23C14/325F02F3/10F02F2200/00
Inventor 欧阳晓平曹红帅齐福刚罗文忠李贝贝陈静钟向丽赵镍刘应都
Owner XIANGTAN UNIV
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