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Preparation method for anti-carbon deposition layer on the surface of steel material part of engine

A technology for iron and steel materials and engines, which is applied to the coating process of metal materials, coatings, gaseous chemical plating, etc., can solve problems such as sudden changes in thermal expansion coefficient, lack of protection, cracking and peeling of coatings, etc., to achieve internal stress Small, prevents adhesion deposits, and prolongs service life

Inactive Publication Date: 2011-08-17
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional methods such as thermal spraying, vapor deposition, sol-gel method, self-propagating high-temperature synthesis technology (SHS), laser cladding technology, and slurry method are used to coat between the coating on the metal surface and the substrate of the steel part. The discontinuity of the organizational structure and the sudden change of the chemical composition lead to a sudden change in the coefficient of thermal expansion between the two, so that a large thermal stress exists between the coating and the substrate, causing the coating to crack and peel off during use, failing to meet the application. Some protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using HT200, a common material for engine parts, as the base material, the sample size is Φ30×30, and the surface coating treatment is carried out, mainly including:

[0022] 1) The surface is smooth and cleaned. Grinding, flattening the sample surface, removing surface dirt and rust. Soak in acetone for 20 minutes under the action of ultrasonic waves to remove surface oil stains, rinse with deionized water to eliminate acetone stains.

[0023] 2) Chemical polishing. Put the sample treated in step 1) into the chemical polishing solution and chemically polish for 3 minutes to reduce the surface roughness to below 0.4 μm. The solution used for chemical polishing is oxalic acid solution with a concentration of 100g / L, treated at normal temperature and pressure, rinsed with deionized water, and dried for later use.

[0024] 3)SiH 4 The Si layer is deposited by thermal decomposition. Put the sample treated in the above step 2) into the program temperature-controlled vac...

Embodiment 2

[0027] Using HT200, a common material for engine parts, as the substrate, the sample size is Φ30×30, and the surface coating treatment is carried out, mainly including:

[0028] 1) The surface is smooth and cleaned. Grinding, flattening the sample surface, removing surface dirt and rust. Soak in acetone for 30 minutes under the action of ultrasonic waves to remove surface oil stains, rinse with deionized water to eliminate acetone stains.

[0029] 2) Chemical polishing. Put the sample treated in step 1) into the chemical polishing solution and chemically polish it for 4 minutes to reduce the surface roughness to below 0.4 μm. The solution used for chemical polishing is oxalic acid solution with a concentration of 80g / L, treated at normal temperature and pressure, rinsed with deionized water, and dried for later use.

[0030] 3) SiH 4The Si layer is deposited by thermal decomposition. Put the sample processed in the above step 2) into the program temperature-controlled vac...

Embodiment 3

[0033] Using HT200, a common material for engine parts, as the substrate, the sample size is Φ30×30, and the surface coating treatment is carried out, mainly including:

[0034] 1) The surface is smooth and cleaned. Grinding, flattening the sample surface, removing surface dirt and rust. Soak in acetone for 35 minutes under the action of ultrasonic waves to remove surface oil stains, rinse with deionized water to eliminate acetone stains.

[0035] 2) Chemical polishing. Put the sample treated in step 1) into the chemical polishing solution and chemically polish it for 5 minutes to reduce the surface roughness to below 0.4 μm. The solution used for chemical polishing is oxalic acid solution with a concentration of 50g / L, treated at normal temperature and pressure, rinsed with deionized water, and dried for later use.

[0036] 3) SiH 4 The Si layer is deposited by thermal decomposition. Put the sample processed in the above step 2) into the program temperature-controlled va...

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Abstract

The invention discloses a preparation method for anti-carbon deposition layer on the surface of a steel material part of an engine. The preparation method comprises the following steps of: surface leveling, cleaning treatment, chemical polishing, chemical decomposition deposition Si membrane, and oxidation treatment. Technological parameters such as temperature, pressure, flow, heat preservation time and the like are adjusted; a diffusion and penetration process of Si and O elements is controlled; compositions and structures of the surface layer of the material and the bounding force between the surface layer of the material and a substrate are changed so as to obtain a compact, adhesive, structure-controlled FeSi / Si / SiO2 coating; and a FeSi / Si / SiO2 gradient transitional composite membrane is obtained on the surface of the steel material part of the engine. The composite membrane has strong bonding force with the substrate, compact organization, small internal stress and smooth inertness, has characteristics of toughness, high-temperature resistance, corrosion resistance, bonding resistance and the like, endows the material with new surface characteristics, prevents the metal from directly contacting with organic matters, prevents the adhesion and deposition of organic colloidal materials and improves anti-carbon deposition performances.

Description

technical field [0001] The invention relates to an anti-carbon deposition method for engine parts, in particular to a preparation method for an anti-carbon deposition coating on the surface of an engine steel material part. Background technique [0002] With the rapid development of energy-saving and environmentally friendly EFI vehicles, the unique fault of EFI vehicles - carbon deposition phenomenon follows. The fuel and lubricating oil in the engine deposit and form carbon deposits on intake valves, piston tops, piston ring grooves, combustion chambers, spark plugs, etc., which can easily cause valves to be closed tightly, engine performance to decline, acceleration to be unsmooth, idling instability, and stalling , shaking, knocking and a series of serious problems. In order to restore the power performance of EFI vehicles, the engine is usually disassembled and then cleaned or cleaned with a special cleaning agent without disassembly. Dismantling and cleaning is not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/24C23C16/44C23C16/56
Inventor 王耐艳金达莱席珍强高林辉陈俊俊
Owner ZHEJIANG SCI-TECH UNIV
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