High-silicon aluminum alloy cylinder sleeve material and preparation method thereof

Abstract

The invention discloses a high silicon aluminum alloy cylinder sleeve material and a manufacturing method thereof., Ingredients of the material by weight percent are as follows: Si: 18.0%-25.0%; Fe: 3.5%-6.0%; Ni: 1%-2%; Cu: 1.5%-3.0%; Mg: 0.5%-1.0%; Mn: 0.5%-1.5%; V: 0.1%-0.5%; Sr: 0.05%-0.15%; and the balance of Al. The manufacturing method thereof comprises the following steps: 1, composition design and accurate mixture which uses an intermediate alloy for quantitative mixture; 2, smelting, covering and refining; 3, injection deposition; 4, extrusion processing; 5, heat treatment; 6, mechanical processing and honing processing. The material and the manufacturing method lead the high silicon aluminum alloy products to have high comprehensive mechanical property characteristics which are superior to mechanical property characteristics of cast iron cylinder sleeve material, have frictional property which are superior to frictional property of steel and cast iron cylinder sleeve material, and have great compatibility with thermophysical property of aluminum piston alloy material, thereby obviously narrowing the gap for cylinder matching. The manufacturing method is characterized in that: the manufacturing process of injection deposition is employed, which serves as a primary means in manufacturing the high silicon aluminum alloy, is superior to the powder metallurgy process and the die-casting process, and can use conventional processing equipment and process conditions.

Description

technical field [0001] The invention belongs to the technical field of metal alloys and their preparation, and in particular relates to a high-silicon aluminum alloy cylinder liner material with heat resistance, wear resistance and low expansion coefficient and a preparation method thereof. Background technique [0002] Engine cylinder clearance determines and affects 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 cylinder matching gap, and can...

AI Technical Summary

Problems solved by technology

A high-silicon aluminum alloy cylinder liner material distributed in British Patent GB972095 contains copper, nickel, iron, manganese and other transition group elements, but the content is low, which will make the alloy's high temperature resistance and tribological properties insufficient, and it is difficult to obtain it by die-casting. Fine and uniform high-hardness compound particle phase and high silicon particles will also cause problems such as poor processability

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 few Both patents use powder metallurgy technology, which will also cause disadvantages such as high manufacturing cost and poor uniformity of mechanical properties.

[0004] The alloys and spray deposition manufacturing methods disclosed in Chinese patents CN00124660.7 and CN200510048662.7 show the superiority of the prepared material structure, but there are shortcomings and problems such as high brittleness of the manufactured material and low mechanical properties at room temperature and high temperature.

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