Method for preparing high-silicon aluminum alloy rheological slurry

Abstract

The invention belongs to the field of semisolid metal forming, and particularly relates to a method for preparing high-silicon aluminum alloy rheological slurry. The method for preparing the high-silicon aluminum alloy rheological slurry with a good refining function on primary silicon and eutectic silicon. The method comprises the steps that a, an aluminum alloy casting coating is smeared on theinner wall of a mechanical roller, and drying and preheating are carried out; b, the dip angle of the mechanical roller relative to the horizontal line of the ground is set to range from 10 degrees to60 degrees, and the stirring speed is set to range from 10 r / min to 500 r / min; and c, the melt temperature of a high-silicon aluminum alloy treated with rare earth elements is kept exceeding the high-silicon aluminum alloy liquidus temperature by 30 DEG C to 50 DEG C, the high-silicon aluminum alloy is poured into the mechanical roller and stirred, and the high-silicon aluminum alloy rheologicalslurry is obtained. According to the method, the high-silicon aluminum alloy rheological slurry achieves a good growth inhibiting function in the precipitating process of the primary silicon and the eutectic silicon, and the smashing and refining function on the primary silicon and the eutectic silicon can be achieved.

Description

technical field [0001] The invention belongs to the field of semi-solid metal forming, in particular to a preparation method of high-silicon aluminum alloy rheological slurry. Background technique [0002] The piston is one of the most critical moving parts of the engine, and it is closely related to the life, efficiency, efficacy, weight and other indicators of the engine. The working environment of the piston is extremely harsh, and it has to bear a large mechanical load and a high thermal load. In order to ensure the good operation of the engine, extremely high requirements are put forward for the materials used in the piston: high high temperature strength, low thermal expansion, good wear resistance and corrosion resistance, good thermal conductivity, etc. With the rise of crude oil prices, the requirements of social environmental protection and the rapid development of manufacturing technology, under the requirements of energy saving, weight reduction and environmenta...

AI Technical Summary

Problems solved by technology

These methods usually require closed treatment in a crucible with a certain capacity, and the quality of the alloy in a single treatment is limited; in addition, the slurry treatment process is in an isothermal and heat preservation state, and the driving force for grain growth is relatively large, which is not conducive to refinement.

Furthermore, the original intention of the design of the above patented method is only around the refinement of primary silicon, and the actual effect is invalid for eutectic silicon

Images