Method for controlling titanium and silicon carbide particles to sufficiently react and brake disc prepared through method

Abstract

The invention discloses a method for controlling titanium and silicon carbide particles to sufficiently react and a brake disc prepared through the method. Intermediate-frequency electromagnetic stirring is carried out on an aluminum-based composite melting solution, through the action of multiple times of pulsation of magnetic force, the number of times of collisions of potassium fluotitanate andsilicon carbide powder is increased the oxidizing reaction process is accelerated, and the quantity of villiaumite and carbon in an aluminum alloy is reduced; in the preparation process of silicon carbide and potassium fluotitanate, after Ti and SiC react, the diameters of particles are large, particle aggregation is prone to happening, the mass ratio is larger than aluminum, sinking is prone tohappening, and the phenomenon that silicon carbide is not uniform in molten aluminum is caused; the aluminum-based composite melting solution is uniform in particle distribution and good in flowability, the material forming effect is improved, and the microhardness and tensile strength of an aluminum-based composite are improved; and by means of the method for controlling titanium and silicon carbide particles to sufficiently react, the aluminum-based composite melting solution is prepared into the aluminum-based brake disc according to design requirements, stress strength is uniform, surfaceroughness is uniform, and 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 brake disc 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 CN201810952100.2: "A method for preparing aluminum-based composite brake discs". In the production process of its products, commonly used equipment The oxidation reaction process between potassium fluorotitan...

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 CN201810952100.2: "A method for preparing aluminum-based composite brake discs". In the production process of its products, commonly used equipment The oxidation reaction process between potassium fluorotitanate and silicon carbide powder is not sufficient, potassium fluoroaluminate and carbon salt by-products will be produced during the alloying process, and metal compound impurities will be brought in during the reaction process, the cleanliness is poor, and the reaction produces During the falling process, the three-phase particles will collide with each other and stick together, sink and diffuse, then aggregate and precipitate, and form a large amount of slag inclusions after forming. Ti and SiC react during the preparation of potassium titanate The diameter of the post-particle adhesion is large and the particles are easy to agglomerate, and the mass ratio is greater than Al, which is easy to sink, resulting in uneven silicon carbide particles in the aluminum liquid, resulting in rough and unstable friction on the surface of the aluminum-based composite disc, and an increase in the friction coefficient. It cannot be solved by equipment, ordinary stirring, and the poor fluidity of aluminum liquid, which limits the use of more efficient die-casting molding technology.

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