Al-Si-Ti composite local reinforcement piston and preparation method thereof

Abstract

The invention relates to an Al-Si-Ti composite local reinforcement piston and a preparation method thereof, and is characterized in that the top of the piston and a ring groove part are reinforced regions formed by self-separated wild phase primary aluminum-silicon-titanium and primary Si in a condensation process of an alloy, and volume fractions of primary wild phases in the reinforced regions are gradually reduced from the top of the piston to the ring groove part; a piston skirt part and a pinhole are non-reinforced regions without wild phases. According to the piston provided by the invention, a continuous transition of tissue structures and performances of the reinforced regions and non-reinforced regions is realized, and the top of the piston and the ring groove part have excellent wear resistance and high temperature resistance to meet requirements of a high-power engine on the piston. According to the invention, the primary wild phases in a smelted homogenous aluminum-based composite are gathered on the top of the piston and the ring groove part by a centrifugal casting method; and the piston has the advantages of simple process and long service life.

Description

technical field [0001] The invention relates to an engine cylinder component, in particular to an Al-Si-Ti composite material locally reinforced piston and a preparation method thereof. Background technique [0002] The piston is one of the main components that generate power in the engine. It bears alternating mechanical loads and thermal loads in the reciprocating frictional motion with the cylinder liner. Whether it has excellent mechanical properties and high temperature resistance has a great impact on the working efficiency and use of the engine. Lifespan has a major impact. In recent years, aluminum alloy pistons have been widely used in the automobile and motorcycle industries. However, with the continuous development of high-power and high-performance engines, further requirements are put forward for engine pistons in terms of strength, high-temperature wear resistance and weight. In order to enhance the strength and high temperature wear resistance of aluminum al...

AI Technical Summary

Problems solved by technology

However, there are no reports on Al-Si-Ti ternary alloys containing high volume fractions of primary Al-Si-Ti and primary Si materials, and there is no use of centrifugal casting to prepare Al-Si-Ti ternary alloys containing high volume fractions. Composite materials with fractional primary reinforcement phase reported

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