High silicon gradient composite aluminum alloy cylinder sleeve material and preparation method thereof

Abstract

The invention discloses a high silicon gradient composite aluminum alloy cylinder sleeve material and a preparation method thereof. The material comprises the following components in percentage by weight: 13.0-27.0 percent of Si, 0.3-2.0 percent of Fe, 0.5-5 percent of Ni, 1.5-4.0 percent of Cu, 0.3-0.8 percent of Mg, 0.3-0.8 percent of Mn, 0.1-0.5 percent of V, 0.05-0.1 percent of Sr, 0.04-0.1 percent of RE, 0.01-0.1 percent of P and the balance of Al. The preparation method comprises the following steps of: carrying out composition design and accurate batching on the materials with preliminary alloys; fusing, covering, refining and inoculation treating; centrifugal casting for forming; thermal treating; and machining and hone machining. The invention is characterized in that a gradient tribology function composite material is obtained by adopting a Sr-P-RE ternary composite modification treatment technology and a centrifugal casting technology controlled by a variable frequency motor, the preparation cost is lower than that of spray deposition technology and a powder metallurgic technology, and the mechanical property and the tribology property of a product is more advantageous than that of the product prepared by a die casting technology; moreover, the prepared cylinder sleeve has more advantageous processing quality and usage effect, and has the advantage of good compatibility with a piston aluminum alloy auxiliary cylinder.

Description

technical field [0001] The invention belongs to the technical field of metal alloys and their preparation, and in particular relates to a heat-resistant, wear-resistant, low-expansion coefficient high-silicon gradient composite aluminum alloy cylinder liner and or bushing material and a preparation method thereof. Background technique [0002] Engine cylinder clearance determines and affects the important parameters of engine power density, exhaust gas pressure, fuel consumption and fuel economy indicators. 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 efficiently and economically solve the technical problems of high power density and high economical engine power. The high-silicon aluminum alloy cylinder liner has good thermophysical compatibility with the piston aluminum alloy material, which can significantly reduce the cy...

AI Technical Summary

Problems solved by technology

A high-silicon aluminum alloy cylinder liner material announced by British Patent GB972095 contains transition group elements such as copper, nickel, iron, and manganese, but the content is low, which will make the alloy's high temperature resistance and tribological properties insufficient; and it is difficult to obtain by die-casting. Small and uniform high-hardness compound particle phase and high silicon particles will cause poor processing performance; there are also problems of insufficient feeding pressure and internal pores, which cannot be strengthened by heat treatment, etc.

British patent GB2302695, European patent EP367229 and US patent PS4155756, 4938810 do not contain transition group elements such as nickel, iron, manganese, and the silicon content is too high, which will make the mechanical properties of this alloy at high temperature and room temperature too low, and these The patented technology adopts powder metallurgy process, which will cause problems such as high manufacturing cost, poor quality consistency and poor uniformity of mechanical properties.

[0004] The alloys disclosed in Chinese patents CN00124660.7 and CN200510048662.7 and the spray deposition manufacturing method show the superiority of the prepared material structure, tribology and mechanical properties, but there is a problem that the manufacturing cost is extremely high, and it is difficult to obtain cast iron cylinder liners for centrifugal casting. The low-cost process effect, the application is limited

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