Method for controlling sufficient reaction of titanium and silicon carbide particles and aluminum-based cylinder sleeve prepared by method

Abstract

The invention discloses a method for controlling sufficient reaction of titanium and silicon carbide particles and an aluminum-based cylinder sleeve prepared by the method. Aluminum-based composite melt is subjected to medium-frequency electromagnetic stirring, and the number of times of mutual collision of potassium fluotitanate and silicon carbide powder is increased under the action of multiplepulses of magnetic force, so that the oxidation reaction process is accelerated, and the number of villiaumite and carbon in aluminum alloy is reduced; in the preparation process of silicon carbide and potassium fluotitanate, after Ti and SiC react, the particle diameter is large, particles are prone to agglomeration, the mass ratio is larger than that of aluminum, sinking is prone to occurrence,and the phenomenon that silicon carbide is not uniform in molten aluminum is caused, so that the aluminum-based composite melt particles are uniformly distributed and not prone to agglomeration, thematerial forming effect is improved, and the microhardness and tensile strength of an aluminum-based composite material are improved; and through the method for controlling sufficient reaction of thetitanium and silicon carbide particles, the aluminum-based casting melt is prepared into the aluminum-based cylinder sleeve according to the design requirement, the stress strength is uniform, the surface roughness is uniform, and the friction performance is stable.

Description

technical field [0001] The invention relates to the technical field of aluminum-based composite materials, in particular to the technical field of aluminum-based cylinder liner preparation. Background technique [0002] Usually by adding different particles to strengthen the aluminum matrix composite material, when preparing the aluminum matrix reinforced composite material containing SiC particles, due to the poor wettability between the SiC particles and the aluminum alloy, the preparation process requires high requirements. At present, there are mainly powder Metallurgy, spray deposition, stir casting and squeeze casting. The existing aluminum-based composite materials have poor fluidity and difficulty in forming in the semi-solid state. The patent application number is CN201620262506.4: "An aluminum-based composite engine cylinder liner". In the production process of its products, common equipment makes fluorine The oxidation reaction process of potassium titanate and s...

AI Technical Summary

Problems solved by technology

The existing aluminum-based composite materials have poor fluidity and difficulty in forming in the semi-solid state. The patent application number is CN201620262506.4: "An aluminum-based composite engine cylinder liner". In the production process of its products, common equipment makes fluorine The oxidation reaction process of potassium titanate and silicon carbide powder is not sufficient, and potassium fluoroaluminate and carbon salt by-products will be produced during the alloying process. In addition, metal compound impurities will be brought in during the reaction process, and the cleanliness is poor. Aluminum-based composite cylinder There are too many remaining aluminum alloys in the casing, the third phase particles generated by the reaction, the three phase particles will collide with each other and stick together during the falling process, they will sink and diffuse, and then aggregate and precipitate, forming a large amount of slag inclusions after forming In the preparation process of potassium titanate, after the reaction of Ti and SiC, the particle adhesion diameter is larger and the particles are easy to agglomerate, and the mass ratio is larger than Al, which is easy to sink, resulting in uneven silicon carbide particles in the aluminum liquid, resulting in aluminum-based composite cylinder liners The surface is rough and the friction is unstable, the friction coefficient increases, which cannot be solved by ordinary production equipment and ordinary stirring, and the fluidity of aluminum liquid is poor, which limits the use of centrifugal casting molding technology with higher efficiency.

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