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首页> 美国卫生研究院文献>Materials >Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites
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Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

机译：由矿物制备复合材料的自然优势：铝土矿添加对Fe-Al2O3基复合材料的组织和性能的影响

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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%.
机译：通过无压烧结制备Fe-Al2O3复合材料，以Bayan Obo铁精矿和铝土矿为主要原料，加入活性炭作为还原剂。研究了不同铝土矿对相组成，显微组织，力学性能和耐蚀性的影响。结果表明，随着铝土矿含量的增加，氧化铝的平均晶粒尺寸减小。此外，铝土矿包含TiO2，CaO和MgO，它们可以在高温下形成液相，从而导致金属相周围微区的热容量不同，从而导致过冷度的变化，并进一步影响到金属相的位错密度。低位错密度可以提高金属相的塑性变形能力。断裂机理分析表明，金属相通过塑性变形吸收能量。样品的最佳性能如下：弯曲强度为310MPa，硬度为12.14GPa，耐碱性为98.32％，耐酸性为95.44％。

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