Casting-rolling method for aluminum matrix composite reinforced by in-situ generated TiB2 particles

Abstract

The invention provides a casting-rolling method for aluminum matrix composite reinforced by in-situ generated TiB2 particles. The casting-rolling method includes the following steps: S1 putting an aluminum ingot into a crucible and keeping the temperature constant for 20-60 min after the aluminum ingot is melted into molten aluminum; S2 preparing reagents KBF4 and K2TiF6 according to the stoichiometric ratio Ti / B = 1:2 and mixing the reagents with catalysts MgF2 and AlF6Na3 evenly; S3 dispersing evenly the chemical reagents dried in the step S2 into the molten aluminum obtained in the step S1and stirring the mixture evenly to prepare a melt mixture; S4 keeping the melt mixture obtained in the step S3 at 700-900 DEG C for a total time of 40-100 min and stirring the melt mixture once every5-20 min for 1-5 min to allow the KBF4 and the K2TiF6 in the melt mixture to react with each other to generate TiB2 particles during the period; S5 removing the scum and keeping the temperature constant; and S6 conducting continuous casting-rolling for formation. According to the casting-rolling method, a fine and uniformly-distributed TiB2-particle reinforcement is obtained by utilizing the in-situ generation process, so that the defects (such as poor wettability at the interface between particles and a matrix as well as uneven distribution of particles) arising when the particle reinforced aluminum matrix composite is prepared by using the traditional external addition process are removed.

Description

Technical field [0001] The invention belongs to the field of casting-rolling forming of metal-based composite materials, and specifically relates to an in-situ generation of TiB 2 The particle-reinforced aluminum-based composite casting method. Background technique [0002] Particle-reinforced aluminum-based composite materials are obtained by distributing carbide, nitride, graphite and other particles in the matrix to obtain excellent comprehensive properties, such as high specific strength, specific modulus, hardness, wear resistance, high temperature resistance, and low thermal expansion coefficient It has broad market prospects in industrial fields such as structure, transportation, electronic packaging, aerospace, and military fields. [0003] At present, there are two main methods for adding particles: external addition process and in-situ generation process. The external addition process is simple to operate, but it is difficult to control the wettability of the particle sur...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method based on in situ generation of TiB 2 The casting and rolling method of particle-reinforced aluminum matrix composites obtains fine and uniformly distributed TiB through the in-situ generation process 2 Particle reinforcement, and use the casting and rolling process to obtain refined grain structure and excellent comprehensive performance to solve the problem of large particles and uneven dispersion in the traditional external addition process and the shortcomings of low production efficiency and high cost of the existing preparation process , and finally realize the efficient short-process near-net forming of particle-reinforced aluminum matrix composites

Images