Cylinder sleeve inner wall heat insulation wear-resistant composite coating layer and preparation method thereof

Abstract

The invention belongs to the field of coating layers and particularly relates to a cylinder sleeve inner wall heat insulation wear-resistant composite coating layer and a preparation method thereof. The coating layer is arranged on the inner surface of a cylinder sleeve and comprises ceramic heat-insulation layers and metal wear-resistant layers which are alternately arranged. In the method, an inner hole plasma spraying system with a double-path powder feeder is adopted to perform preparation of the coating layer, metal powder and ceramic powder are sent into a plasma arc flame flow at the same time, the cylinder sleeve rotates around the axis self, an inner hole spray gun head of the inner hole plasma spraying system extends into the cylinder sleeve to move up and down in a reciprocatingmanner through a control program, powder parameters and powder feeding parameters are adjusted, a trajectory is adjusted and controlled, and the composite coating layer with a layered structure is obtained. The alternate layered coating layer is capable of insulating heat and resisting corrosion, enables the cylinder sleeve to perform heat dissipation by conducting the heat to a matrix along thecoating layer and a temperature of the interior of the cylinder sleeve to be maintained within a certain range, so that severe high-temperature wear cannot be caused by heat insulation in a severe high-temperature environment, the abrasion loss of the cylinder sleeve can be effectively reduced, and the heat efficiency of an engine can be improved.

Description

technical field

[0001] The invention belongs to the field of surface coatings, in particular to a heat-insulating and wear-resistant composite coating on the inner wall of a cylinder liner and a preparation method thereof. Background technique

[0002] In the 21st century, diesel engines have become the main supporting power for automobiles, ships, agricultural machinery, construction machinery, diesel locomotives, and military equipment, mobile and standby power stations. Diesel engines have the highest thermal efficiency and the best energy utilization rate among various machinery. , The most energy-saving models, diesel engines are also developing in the direction of low energy consumption, high efficiency and durability. As the most important core component of a diesel engine, the cylinder liner has a very harsh working environment. The inner surface of the cylinder liner bears the reciprocating friction of the piston and the impact of high-temperature gas when the combu...

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