Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Abstract

Fe-Al2O3 composites were prepared by pressureless sintering, using Bayan Obo iron concentrate and bauxite as the main raw materials, activated carbon was added as the reducing agent. The effects of different bauxite additions on the phase composition, microstructures, mechanical properties, and the corrosion-resistance were investigated. The results show that the average grain size of alumina decreased as the bauxite content increased. In addition, bauxite contains TiO2, CaO, and MgO, that can form a liquid phase at high temperature, causing the heat capacity of the micro-zone around the metal phase to be different, which leads to a change of undercooling and further affects the dislocation density of the metal phase. The plastic deformation ability of the metal phase can be improved with the low dislocation density. Fracture mechanism analysis indicated that the metal phase absorbed energy through plastic deformation. The optimum performance of the sample was as follows: the flexural strength was 310 MPa, the hardness 12.14 GPa, the alkali resistance 98.32%, and the acid resistance 95.44%.

Reliability and Mechanical Properties of Materials Recycled from Multilayer Flexible Packages

“…Aluminium is produced from bauxite and is a non-renewable (as all the minerals and respective metals) resource [ 8 , 9 ]. It is necessary determine its recycling quota [ 10 ].…”

“…It is necessary determine its recycling quota [ 10 ]. Aluminium production is an industrial process that consumes a great amount of energy [ 8 , 9 , 10 , 11 ]. The process has an important environmental impact, due to several tons of mineral wastes [ 12 ].…”

“…Below is shown some aspects related to the different components of Tetra Pak ® that influence on the package LCA. Aluminium is produced from bauxite and is a non-renewable (as all the minerals and respective metals) resource [8,9]. It is necessary determine its recycling quota [10].…”

Study on Iraqi Bauxite Ceramic Reinforced Aluminum Metal Matrix Composite Synthesized by Stir Casting

“…Currently, researchers are showing immense interest to strengthening of AMMCs with ceramic materials such as silicon carbide, boron carbide and zirconium oxide [3,5]. Many studies have investigated the natural advantage of preparation of composites from minerals such as bauxite particles, and proved their effectiveness as cost effective reinforcing agents in fabrication of high performance composites [6,7].…”