A three-dimensional interpenetrating al by in situ reaction 2 o 3 /al composite approach

Abstract

A three-dimensional interpenetrating Al prepared by in-situ reaction 2 o 3 / Al composite method, the SiO 2 Add powder, water, boric acid, ammonium polyacrylate, and carboxymethyl cellulose to water, mix and prepare SiO 2 Ceramic slurry; polyurethane foam impregnated into SiO 2 Carry out vacuum impregnation and slurrying in the ceramic slurry, sinter after drying, and then place it in molten aluminum at 800-1100°C, and keep it warm for 20min-240min. Due to the in-situ reaction, the interface between the alumina reinforcement and the aluminum matrix in this material is clear and well bonded; the alumina ceramics produced by the reaction maintain the appearance and structure of the network silica ceramics before the reaction; the formed alumina network As a reinforcement, ceramics are continuously distributed in the aluminum matrix, which can effectively disperse the load and improve the strength of the alumina / aluminum composite material; the formed network alumina reinforcement is harder than the aluminum matrix, which can effectively improve the alumina / aluminum composite material. wear resistance.

Description

technical field [0001] The invention belongs to the field of material technology, and relates to a method for preparing three-dimensional through Al through in-situ reaction. 2 o 3 / Al composite method. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, and easy forming. It is one of the ideal metal materials for the transportation industry to achieve the goal of light weight and high speed, and has been widely used in the industrial field. The way to further strengthen the performance of aluminum alloy is to form composite materials, such as: particle reinforcement, fiber reinforcement and so on. However, there are some problems in the traditional composite method: 1). Uneven dispersion, easy to agglomerate, resulting in unstable performance of the material; 2). Anisotropy (fiber reinforcement), the performance of different orientations of the material is not the same; 3). Reinforcement There is discontinuity in the th...

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Problems solved by technology

However, there are some problems in the traditional composite method: 1). Uneven dispersion, easy to agglomerate, resulting in unstable performance of the material; 2). Anisotropy (fiber reinforcement), the performance of different orientations of the material is not the same; 3). Reinforcement There is discontinuity in the three-dimensional space of the body, and the reinforcement effect needs to be improved; 4). There is an upper limit for the amount of ceramic reinforcement added;

However, this method has the problem of uneven distribution of reinforcement particles formed by the reaction

Although various stirring methods are used, the silicon oxide powder cannot be uniformly distributed in the metal aluminum, and at high temperatures, the silicon oxide has already begun to react with the aluminum liquid during stirring, resulting in uneven distribution of the components of the composite material. To ensure the performance of the composite material, it is important that the formed composite material is not a three-dimensional network composite material, and no connection is formed between the reinforcements, and it is actually a particle-reinforced composite material.

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