Metal composite ceramic cylinder sleeve and ceramic infiltration method thereof

Abstract

The invention discloses a metal composite ceramic cylinder sleeve. Composite film ceramic is attached to the inner surface of the cylinder sleeve, and new material is formed on the metal surface through interdiffusion between the film ceramic and a cylinder sleeve base body material. A ceramic film is BN-SiN, the molecular structure of the ceramic film is of a hexagonal crystal structure and has self-lubrication performance, after ceramic infiltration, the friction coefficient of the inner surface of the cylinder sleeve is reduced to one sixth, and the hardness is improved by 41%. The thickness of the ceramic film layer is 3 micrometers -6 micrometers, and the infiltration depth is 35 micrometers-55 micrometers; and the ceramic composite film grows in the environment at the low temperature of 255 DEG C-265 DEG C. The composite film structure of the metal composite ceramic cylinder sleeve is firm and can not fall off, the inner surface of the cylinder sleeve is resistant to abrasion and high temperature and small in friction coefficient, so that engine power is improved, oil consumption is reduced, and emission pollution is reduced.

Description

technical field [0001] The invention relates to a metal-composite ceramic cylinder liner and its infiltration method, in particular to obtaining a metal-ceramic composite layer on the inner surface of the engine cylinder liner by using low-temperature plasma chemical vapor deposition technology and its implementation method. Background technique [0002] The cylinder liner is the core component of the engine. Its inner surface is directly affected by high-temperature and high-pressure gas, and it always has high-speed sliding friction with the piston ring and piston skirt, and wears quickly, causing the gap between the inner wall of the cylinder liner and the piston ring to become large prematurely. , resulting in reduced engine power, difficulty in starting, increased fuel consumption, and excessive emissions. In order to make the cylinder liner wear-resistant and wear-reducing under the harsh environment of high temperature and high pressure, people carry out infiltration ...

AI Technical Summary

Problems solved by technology

[0002] The cylinder liner is the core component of the engine. Its inner surface is directly affected by high-temperature and high-pressure gas, and it always has high-speed sliding friction with the piston ring and piston skirt, and wears quickly, causing the gap between the inner wall of the cylinder liner and the piston ring to become large prematurely. , resulting in reduced engine power, difficulty in starting, increased fuel consumption, and excessive emissions

In order to make the cylinder liner wear-resistant and wear-reducing under the harsh environment of high temperature and high pressure, people carry out infiltration treatment on the inner surface of the cylinder liner. The similar technology at home and abroad uses flame spraying method or high-temperature plasma spraying method to spray ceramic powder on the metal surface. The disadvantage is that the thermal expansion coefficients of ceramics and metals are too different, and the coating is prone to peeling off. In addition, the high-temperature ceramic powder will cause local overheating of the metal surface during spraying and damage the base material.