Thermal spraying composite coating material for piston ring and preparation method of thermal spraying composite coating material

Abstract

The invention discloses a thermal spraying composite coating material for a piston ring and a preparation method of the thermal spraying composite coating material, belonging to the field of material surface engineering. The composite coating material is mainly formed by mechanically mixing four different powders in percentage by mass: 20-60wt.% of TiO2 as a ceramic material with the powder diameter of 20-120mum, 0-30wt.% of NiCrBSiFe as a self-melting alloy with the powder diameter of 30-130mum, 20-40wt.% of Cr2O3 as a ceramic reinforced material with the powder diameter of 10-70mum and 0-20wt.% of nickel-coated graphite C-Ni as an antifriction material with the powder diameter of 20-120mum. A wear-resistant coating for the piston ring is prepared by using an atmosphere plasma spraying technology, and the prepared coating has excellent wear resistance.

Description

technical field

[0001] The invention relates to a thermal spraying composite coating material for piston rings and a preparation technology thereof, which belongs to the technical field of composite materials and thermal spraying, and is mainly applied to the field of wear-resistant coatings of piston rings. Background technique

[0002] The piston ring is a key component in the engine. It reciprocates up and down at a high temperature for a long time. The speed at the top and bottom dead centers of its stroke is close to zero. It is difficult to establish a lubricating oil film. Statistically, the friction and wear of the piston ring accounts for the largest proportion of the wear and tear of the whole machine, about 40%.

[0003] At present, surface coating technology is often used to improve the wear resistance of piston rings. Commonly used technologies include electroplating, nitriding, thermal spraying, PVD, CVD, etc. Electroplating technology seriously pollutes the e...

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