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Boron cast iron air cylinder sleeve carbon scraping ring coating and preparation and spraying method thereof

A cylinder liner and cast iron technology, applied in chemical instruments and methods, coatings, metal material coating processes, etc., can solve the problems of low structural hardness and easy damage of carbon scraping ring accessories, and achieve excellent heat resistance and high temperature hardness. and high temperature oxidation resistance, the effect of solving the problem of easy wear and tear

Inactive Publication Date: 2017-07-25
安徽威龙再制造科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems in the prior art that the surface of the piston that cooperates with the cylinder liner is easy to accumulate a large amount of carbon deposits, and the structure of the carbon scraping ring accessories has low hardness and is easy to be damaged, the present invention provides a boron cast iron cylinder liner carbon scraping ring coating Its preparation and spraying method

Method used

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  • Boron cast iron air cylinder sleeve carbon scraping ring coating and preparation and spraying method thereof
  • Boron cast iron air cylinder sleeve carbon scraping ring coating and preparation and spraying method thereof
  • Boron cast iron air cylinder sleeve carbon scraping ring coating and preparation and spraying method thereof

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Embodiment 1

[0053] The boron cast iron cylinder liner scraping carbon ring coating 2 of the present embodiment, as figure 1 As shown, it is set on the neck of the cylinder liner 1, and the composition of the carbon scraping ring coating 2 is NiCr-Cr 3 C 2 Composite coating, NiCr alloy has excellent heat resistance, corrosion resistance, high temperature oxidation resistance and other properties, and also plays the role of binder phase, Cr 3 C 2 It has good high-temperature hardness and high-temperature oxidation resistance, acts as a hard phase, and mainly plays the role of second-phase particle dispersion strengthening in the coating, which can solve the problem that cylinder liner 1 is easily worn out under high-temperature and complex working conditions , The problem of low service life. Moreover, NiCr-Cr 3 C 2 It has a linear expansion coefficient close to that of the cylinder liner 1, thereby greatly reducing the spalling or even failure of the coating caused by thermal shock, t...

Embodiment 2

[0061] The carbon scraping ring coating of the boron cast iron cylinder liner of the present embodiment has the same basic structure as that of the embodiment 1, the difference and improvement are: NiCr-Cr 3 C 2 The thickness of the composite coating is 400 μm. After the cylinder liner 1 is sprayed with the carbon scraping ring coating 2, its inner diameter is usually 400 μm smaller than that of the cylinder liner. Therefore, a stepped shape is formed inside the cylinder liner; there are undercut grooves 22 on the top and bottom of the cylinder liner. The cutting edge 21 of the carbon scraping ring is formed in the middle, and the carbon deposit on the piston head is continuously scraped off by the knife edge during the reciprocating movement, so no thick carbon deposit can be formed, and the scraped carbon deposit is immediately blown away by the exhaust gas, and the oil film on the surface of the cylinder liner The cylinder liner and piston ring are not damaged, and the cyli...

Embodiment 3

[0063] The carbon scraping ring coating of the boron cast iron cylinder liner of the present embodiment, the basic structure is the same as embodiment 1, the difference and improvement are: the content of boron in the boron cast iron is 0.05%; NiCr-Cr 3 C 2 Composite coating thickness is 500μm, Cr 3 C 2 The content is 70%, NiCr is 30%.

[0064] Boron cast iron cylinder liner scraping carbon ring coating material preparation of the present embodiment: NiCr-Cr 3 C 2 Mixed nano powder, wherein, nano Cr 3 C 2 The preparation method of powder is:

[0065] Step 1: Mixing: put ammonium dichromate powder and nano-carbon black powder in distilled water with a weight ratio of 1:0.17, mix and stir evenly to form a fluid state, and add it to a square mold Compression molding is a precursor; after compression, it is a block to facilitate quick freezing;

[0066] Step 2: Quick freezing: Quickly transfer the precursor into a -100°C quick freezing space for quick freezing for 150 minu...

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Abstract

The invention discloses a boron cast iron air cylinder sleeve carbon scraping ring coating and a preparation and spraying method thereof and belongs to the technical field of improvement of air cylinder sleeves. The boron cast iron air cylinder sleeve carbon scraping ring coating is arranged on the neck of an air cylinder sleeve. The carbon scraping ring coating is a nicr-Cr3C2 composite coating. Nicr alloy has excellent heat resistance, corrosion resistance, high-temperature oxidation resistance and other properties and also achieves a binding phase function. Cr3C2 has good high temperature hardness and high-temperature oxidation resistance and achieves a hard phase function. The component of the air cylinder sleeve is boron cast iron. According to the boron cast iron, boron is added into gray cast iron, and different-amount cast iron containing boron cementite or ledeburite structures can be obtained in a metallographic structure. With increase of the boron content, microhardness is improved, but adding of too much boron can also cause lowering of toughness. Through the boron cast iron air cylinder sleeve carbon scraping ring coating and the preparation and spraying method thereof, the problems that a large number of carbon deposits are very liable to be accumulated on the surface of a piston, and the structure of a carbon scraping ring part is low in hardness and is liable to damage can be solved.

Description

technical field [0001] The invention relates to the technical field of improving cylinder liners, in particular to a carbon scraping ring coating of a boron cast iron cylinder liner and a preparation and spraying method thereof. Background technique [0002] With the increase of engine power and the extension of running time, especially for diesel engines using heavy oil, a large amount of carbon deposits are easily accumulated on the surface of the piston that cooperates with the cylinder liner. These accumulated carbon deposits affect the stable operation of the engine on the one hand, and cause The rapid increase in lubricating oil consumption has further increased operating costs. Under this background, the scraping carbon ring technology came into being. In the prior art, there are mainly two types of structural forms for setting the carbon scraping ring in the cylinder liner, one is to form a carbon scraping ring by spraying composite materials at a suitable position i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/129C23C4/18C01B32/914B82Y30/00F02F1/00
CPCB82Y30/00C23C4/06C23C4/18F02F1/00
Inventor 凤国保李志忠
Owner 安徽威龙再制造科技股份有限公司
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