Graded aluminium alloy cylinder liner material and preparing method thereof

Abstract

The invention relates to a graded aluminium alloy cylinder liner material and a preparing method thereof. The graded aluminium alloy cylinder liner material is characterized by containing following component, by weight, 15.0%-25.0% of Si, 3.0%-7% of Ni, 0.8%-1.8% of Mg, 0.5%-2.5% of Cu, 0.3%-0.7% of Mn, 0.04%-0.10% of RE, 0.01%-0.10% of P, and the balance aluminium. The preparing steps comprise burdening according to alloy components; smelting, covering, refining, purifying, and modifying; centrifugal force field forming; heat treating; and obtaining required end products after machining and honing. According to the graded aluminium alloy cylinder liner material and the preparing method thereof, by means of the alloy formula containing high content of Si, Mg and Ni, structural texture containing the high content of Si, Mg2Si and Ni is formed beneficially, and the prepared graded cylinder liner material has the advantages of being resistant to high temperature, resistant to abrasion, and low in dilatation coefficient. Meanwhile, the P-RE double compound modification process technique and a centrifugal force field controlled by a variable frequency motor are utilized, primary silicon and eutectic silicon phase texture are strongly refined, and tribology performance of the cylinder liner is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metal alloys and their preparation, and in particular relates to a gradient aluminum alloy cylinder liner material with heat resistance, wear resistance and low expansion coefficient and a preparation method thereof. Background technique [0002] Cast iron, steel cylinder liner materials and piston aluminum alloy materials have poor thermophysical compatibility, which makes it difficult to further reduce the cylinder matching gap, and cannot solve the technical problems of high power density and high economical engine power with high economical efficiency. The high-silicon aluminum alloy cylinder liner has good thermophysical compatibility with the piston aluminum alloy material, which can significantly reduce the cylinder matching gap, and can solve or overcome the shortcomings and shortcomings of cast iron and steel cylinder liners. [0003] The friction mechanism of high-silicon aluminum alloy is the d...

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Problems solved by technology

[0004] A high-silicon aluminum alloy cylinder liner material announced by British Patent GB972095 contains alloying elements such as copper, nickel, iron, and manganese, but the total content of alloying elements is low, which will make the alloy insufficient in high temperature resistance and tribological properties; It is difficult to obtain fine and uniform high-hardness compound particle phases and high-silicon particle phases by die-casting methods, which will result in poor processability; there are also problems such as insufficient feeding pressure, internal pores, and inability to strengthen through heat treatment.

[0005] British patent GB2302695 and European patent EP367229 disclose a high-silicon aluminum alloy cylinder liner material that does not contain transition elements such as nickel, iron, and manganese, which will make the alloy have low mechanical properties at high temperature and room temperature, and adopt powder metallurgy technology. As a result, the manufacturing cost is extremel...

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