Super corrosion resistant cylinder jacket used for engine

A cylinder liner, corrosion-resistant technology, applied in the direction of engine components, machines/engines, cylinders, etc., can solve the problems of high friction power, corrosion fatigue cracking, short service life, etc., and achieve low friction, long service life and slight wear Effect

Inactive Publication Date: 2004-12-29
SHANGHAI MICROPOWERS
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The present invention is to provide a super corrosion-resistant cylinder liner for an engine, which solves the technical problems that the existing engine cylinder liner is prone to cavitation, corrosion fatigue cracking, short service life and high frictional power

Method used

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  • Super corrosion resistant cylinder jacket used for engine

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Embodiment Construction

[0014] The present invention adopts duplex stainless steels such as 00G18Ni5Mo3Si2, or 00Cr18Ni5Mo3Si2Nb, 00Cr22Ni5Mo3N or 00Cr25Ni6Mo2N, in which ferrite and austenite each account for about half of the solid solution structure, to manufacture cylinder liners for engines (comprising internal combustion engines and heat engines). The cylinder liner needs to be annealed to eliminate its internal stress first. The annealing temperature is 550℃~650℃, and the working surface of its inner diameter should be finished so that the roughness of the working surface can reach Ra0.4. Then, ion nitriding is carried out on the cylinder liner under the temperature condition of 550°C-650°C, so that the working surface of the present invention has a nitrided layer with a thickness of 0.02-0.12mm.

[0015] In the present invention, after ion nitriding, the working surface needs to be polished or ultra-finely ground, so that the roughness of the working surface can reach Ra0.2.

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Abstract

The extremely anticorrosive cylinder liner for engine is made of double-phase stainless steel comprising one half of ferrite and one half of austenite in the solid solution structure. The working surface is ionic nitrizing treated at 550-650 deg.c to form nitride layer of 0.02-0.12 mm depth. The cylinder liner of the present invention is superior to available ones, which have the demerits of cavitation erosion, erosion fatigue cracking, short life and great friction power consumption.

Description

Technical field: [0001] The present invention relates to components of engines, in particular to cylinder liners of engines. Background technique: [0002] The cylinder is the main place in the engine to convert the heat energy of the working fluid into mechanical work. Because of the huge difference between its working environment and the body and other parts, as well as the needs of manufacturing, the cylinder liner is often used (see figure 1 ) in the form of an important part of the engine. In internal combustion engines, the cylinder liner mainly considers the damage caused by the friction between the piston and the piston, so cast iron with low friction coefficient such as gray cast iron, low alloy cast iron, high phosphorus alloy cast iron, boron cast iron and other materials are usually used to manufacture cylinder liners; in addition , Nitriding processes such as gas nitriding and soft nitriding are also used to improve its wear resistance and anti-seizing ability....

Claims

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Application Information

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IPC IPC(8): F02F1/00
Inventor 金东寒陈志林王晓武陈文云
Owner SHANGHAI MICROPOWERS
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