Manufacturing method of spraying corrosion-resistant layer on outer wall of engine cylinder liner

Abstract

The invention discloses an engine cylinder liner and a method for manufacturing it by spraying a corrosion-resistant layer on its outer wall. Fermentation, precipitation, the step of taking out the sediment and drying it into powder; 2) injecting static electricity into the cylinder liner product, spraying the above powder composition on the outer wall of the cylinder liner, and sending it into the sintering furnace to warm up before the static electricity is eliminated. Sintering for 1.5-2.2 hours, taking it out after 25-35 minutes of heat preservation, and obtaining the step of sintering the ceramic corrosion-resistant material layer on the surface of the cylinder liner; 3) removing the ceramic corrosion-resistant material at the upper and lower ends of the outer wall of the cylinder liner that does not contact the cooling water Floor. The present invention injects static electricity during spraying and sinters the porcelain layer on the outer wall of the cylinder liner at medium temperature, and injects static electricity to make the porcelain layer firmly bonded to the outer wall of the cylinder liner during sintering, achieving better corrosion resistance, and the effect is obvious. Utilizing the combination of the above specific formulas can change the turning surface hardness of the porcelain layer, so that no tooth edge will be produced during turning, and the processing cost can be reduced.

Description

technical field [0001] The invention relates to an engine cylinder liner and a manufacturing method thereof, which are used for engine cylinders of heavy vehicles, heavy tanks, trains and ships. Background technique [0002] The diesel engine cylinder is an important part of the combustion chamber. Its working environment is harsh and it is one of the more easily damaged parts on the diesel engine. The wear-resistant engine cylinder liner is one of the national "863" scientific and technological research projects, included in the National Natural Science Foundation of China, the National Defense Advance Research Fund, etc. product. The inner wall of the cylinder liner is not only in contact with high temperature and high pressure gas (generally up to about 800°C), but also in contact with the cold air in the intake process (only a few tens of degrees Celsius), the temperature changes drastically during the working process; the lubrication condition is very poor, the outer w...

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Problems solved by technology

[0004] In the prior art, in order to solve the above defects, electroplating or phosphating treatment is generally used on the surface of the cylinder liner to improve its anti-corrosion ability, but the effect is not very satisfactory, and the production process is not environmentally friendly.