Stibium elementarysubstance for accelerating form of type A plumbago in cylinder cover

Abstract

The present invention relates to a method with adoption of stibium element which improves the formation of A-type graphite, and is suitable for the requirement on the motor cylinder collar, such as high abrasion-proof quality, and long life span. The present invention uses stibium element to make the size of graphite in the metallography of the cylinder collar be diminished significantly, to obtain the shred-like A-type graphite with even distribution. The latent heat of the melting stibium is great (19875.8J/mol), therefore, when the stibium is added, the temperature in the micro area is caused to vary, which increases the quantity of the cores of the graphite. The volume of the added stibium is controlled between 0.070 and 0.096 percent.

Description

Technical field [0001] The invention relates to an antimony element that promotes the formation of A-type graphite in a cylinder liner, which is suitable for the requirements of high wear resistance and long service life of the engine cylinder liner. Background technique [0002] Traditional low-alloy cast iron and alloy cast iron cylinder liners, the metallographic structure is difficult to achieve large-area A-type graphite, the length of graphite is long, the grain is coarse, the structure is loose, the mechanical properties are low, and after a period of use, the wear of the inner hole increases , There is a large gap between the cylinder wall and the piston ring, which causes the engine to increase the exhaust volume, reduce the power, greatly increase the oil consumption, and shorten the service life of the engine. In severe cases, accidents such as cylinder pulling and platform breaking also occur. Contents of the invention [0003] The invention uses the antimony ...

AI Technical Summary

Problems solved by technology

[0002] Traditional low-alloy cast iron and alloy cast iron cylinder liners, the metallographic structure is difficult to achieve large-area A-type graphite, the length of graphite is long, the grain is coarse, the structure is loose, the mechanical properties are low, and after a period of use, the wear of the inner hole increases , There is a large gap between the cylinder wall and the piston ring, which causes the engine to increase the exhaust volume, reduce the power, increase the oil consumption, and shorten the service life of the engine.

In severe cases, accidents such as cylinder pulling and platform breakage may also occur

Images