Preparation method of high silicon-aluminum-carbon nano-tube intermediate alloy

Abstract

The invention discloses a preparation method of a high silicon-aluminum-carbon nano-tube intermediate alloy. The method comprises the following steps: adding aluminum-silicon alloy powder and a carbon nano tube into a ball mill at the ratio that the carbon nano-tube accounts for 6-10wt% of the total weight of the raw materials, and carrying out ball milling in a vacuum environment or in the presence of inert gases to acquire even mixed powder; then putting the mixed powder into a mold, cooling to a static pressure at room temperature, then carrying out hot-pressure sintering at a temperature of 580-600 DEG C at a hot-pressing pressure of 0-30MPa to acquire the high silicon-aluminum-carbon nano-tube intermediate alloy, wherein the content of Si in the Al-Si alloy powder accounts for 15-25wt% of the weight of the alloy. The preparation method has the advantages that a SiC coating layer formed on the surface of CNTs in the intermediate alloy improves the wettability between CNTs and alloy melt, CNTs in the acquired alloy is evenly dispersed, the process is simple, and the industrial production is benefited.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation. It relates to a preparation method of a nano-reinforced metal-matrix composite material. Background technique [0002] The interface problem has always been the core issue of carbon nanotubes (CNTs) reinforced aluminum matrix composites. It is well known that the surface tension of CNTs is extremely low, 45.3 mN / m, while that of aluminum alloy is about 800 mN / m. Therefore, the wettability between aluminum alloy and CNTs is extremely poor, and the bonding between CNTs and aluminum alloy atoms depends only on van der Waals force. The general method to solve the problem of the interface between carbon fiber and aluminum is to use coating and vapor deposition technology to coat the surface of carbon fiber. The main purpose of the coating is to prevent the reaction between the fiber and the matrix, and at the same time improve the wettability. Many scholars use Cu, Ni, TiB, Al on...

AI Technical Summary

Problems solved by technology

But Al 4 C 3 The formation of the carbon nanotubes destroys the integrity of the carbon nanotubes, and the Al 4 C 3 It is a needle-like brittle phase, which is easy to cause stress concentration when formed in the matrix, and will seriously affect the mechanical properties of the composite material

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