High-heat-insulation ultra-thin coating for centrifugal casting cylinder liner and production method thereof

Abstract

The invention relates to a high-heat-insulation ultra-thin coating for a centrifugal casting cylinder liner. The coating is prepared from, by weight, 20-30 parts of cryolite powder, 18-22 parts of bentonite, 20-30 parts of high-alumina powder, 13-17 parts of coke powder, 4-6 parts of glaze powder, 1.5-2.5 parts of flour, 0.8-1.3 parts of soap powder, 6-8 parts of water glass and proper amount of water. The invention also discloses a production process of the high-heat-insulation ultra-thin coating. The high-heat-insulation ultra-thin coating has the advantages that in the centrifugal casting process of the cylinder liner, a high-heat-insulation adhesion layer is formed in an inner cavity of a die, a small amount of coating is added every time, when the thickness of the coating on the outersurface of a cylinder liner blank is only 0.2-0.3mm, normal production can be realized, the internal quality of the cylinder liner can be improved, the cost is reduced, the rejection rate is reduced,the cooling speed in the centrifugal casting process is remarkably reduced, A-type graphite is realized, the dendrite and aggregation tendency is reduced, the internal quality of the cylinder liner is improved, and the service life of the die is prolonged.

Description

technical field [0001] The invention relates to the technical field of paint used in cylinder liners, in particular to a high heat-insulating ultra-thin paint for centrifugal casting cylinder liners and a production method thereof. Background technique [0002] The cylinder liner is one of the core components of the internal combustion engine, and its performance directly affects the fuel consumption, power, reliability and safety of the vehicle. Centrifugal casting is commonly used in the manufacture of cylinder liner blanks. The heat insulation performance of the coating directly affects the strength, hardness, metallographic, wear resistance, and scrap rate of the cylinder liner. At the same time, the amount of coating also directly affects the cost of centrifugal casting. [0003] At present, the existing cylinder liner paint and its production method make the cylinder liner poor in strength, hardness, metallographic appearance and wear resistance, and have high scrap ra...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing cylinder liner coating and its production method make the strength, hardness, metallographic and wear resistance of the cylinder liner poor, and the scrap rate and cost are high

In addition, the existing coatings for centrifugal casting of cylinder liners contain a lot of moisture and poor thermal insulation properties. The thickness of the coatings is 1.5-2 mm, which is likely to cause defects such as pores and slag inclusions on the casting surface, thereby shortening the service life of the cylinder liners. In order to eliminate these defects, it is necessary to The cylinder liner blank margin is designed to be large, so raw and auxiliary materials are wasted, and the manufacturing cost remains high