A kind of aluminum-silicon alloy for cylinder liner and its preparation process

Abstract

The invention discloses an aluminum-silicon alloy for a cylinder liner and a preparation process of the aluminum-silicon alloy. The aluminum-silicon alloy is prepared from the compositions in percentage by mass: 12-15% of Si, 1-5% of Cu, 1-4% of Ni, 0.5-2.5% of Mg, 0.01-0.1% of Sr, 0.1-1% of a mixed rare earth element RE, less than 1% of impurity elements, and the balance of Al, and the sum of thetotal amounts of the compositions is 100%. According to the aluminum-silicon alloy for the cylinder liner and the preparation process of the aluminum-silicon alloy, the aluminum-silicon alloy with the silicon content close to an eutectic point is used as a matrix, only Cu, Ni, Mg and other elements are selectively added, the modification process of an alloy phase is simplified, and the cutting action of the alloy relative to the matrix is weakened; due to the low silicon content, primary silicon phases are few and small, pressure casting molding processes (such as extrusion casting, ordinarypressure casting and low-pressure casting) are adopted, the solid solubility of silicon in alpha-Al is increased, an Sr / RE composite modificator is used for modifying eutectic silicon and the alloy phase, the performance of the aluminum-silicon alloy is comprehensively improved, combined with an optimized T6 treatment process, a product has the advantages of smaller specific gravity, lower linearexpansion coefficient, and higher abrasive resistance and volume stability, and the application requirements of the cylinder liner are met.

Description

technical field [0001] The invention relates to the technical field of metal alloys and their preparation, in particular to an aluminum-silicon alloy for cylinder liners and a preparation process. Background technique [0002] In order to achieve energy saving and emission reduction of automobiles, in addition to developing green and clean energy, realizing the weight reduction of the whole vehicle is the top priority. Some studies have shown that if the weight of the vehicle is reduced by 10%, the fuel efficiency can be increased by 6% to 8%; for every 100 kg of vehicle mass reduction, the fuel consumption per 100 kilometers can be reduced by 0.3 to 0.6 liters, and the weight of the vehicle can be reduced by 1%. 0.7% lower. In the process of maturing electric vehicle technology, improving the overall performance of oil and gas engines is still the research and development direction of the automotive industry. As an important part of the engine, the cylinder liner works un...

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Problems solved by technology

[0007] The purpose of the present invention is to provide an aluminum-silicon alloy for cylinder liners and its preparation process in view of the shortcomings of the existing materials for cylinder liners

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