Piston made of Al/Si-Mg*Si composite material and preparation method thereof

Abstract

The invention relates to a piston made of Al / Si-Mg*Si composite material and a preparation method thereof. The top part and the ring groove part of the piston are served as reinforcing particle areas for Si and Mg2 Si material to spontaneously precipitate during alloy solidification process, and reinforcing particles in the reinforcing particle areas are decreased from high to low from the top part in contact with a combustion chamber to the ring groove part; a section from a skirt section to a pin boss is served as a basal body, and is served as a reinforcement-free particle area for eutectic crystal or hypo eutectic Al-Si alloy. The piston of the invention has a light weight, can be recycled repeatedly, has a low cost and meets the requirements of energy conservation and environment protection, and the manufacturing process is simple. The top part and the ring groove part of the piston has the advantages of high hardness, high wear resistance and low coefficient of thermal expansion; and the skirt section and the pin boss of the piston have advantages that that the mechanical strength is good, the requirements of high power engine for piston performance can be met, the heat treatment can be performed according to the requirements of the machining and the performance, the subsequent processing is convenient , and the service life is long.

Description

technical field [0001] The present invention relates to a kind of piston that is used for engine, particularly relates to a kind of Al / Si-Mg 2 Piston of Si composite material and preparation method thereof. Background technique [0002] The piston is the "heart" of the engine, which bears alternating mechanical loads and thermal loads, and is one of the key components in the engine with the worst working conditions. The piston is divided into three parts: head, skirt and piston pin seat. The head consists of a piston top and a ring groove portion. Usually, the top of the piston is flat or close to flat, so as to reduce the contact area between the piston and the high-temperature gas and make the stress distribution uniform. The groove of the piston is called the ring groove, which is used to install the piston ring. The piston skirt refers to the lower part of the piston. Its function is to keep the vertical posture of the piston in the reciprocating motion as much as po...

AI Technical Summary

Problems solved by technology

However, this method has very strict requirements on the pretreatment of particles, the material preparation process is complicated, and its cutting performance cannot be improved by heat treatment, subsequent machining is difficult and the processing cost is high

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