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采用原位反应结合热压烧结工艺制备了Al2O3质量分数为10%和20%的Fe-28Al-5Cr基复合材料,研究了它们的物相、显微组织、力学性能,以及室温和200,400,600,800℃下的摩擦磨损性能,并与采用外加Al2O3方法制备的相同复合材料进行了对比。结果表明:原位合成Al2O3制备的复合材料由Fe3Al和Al2O3两相组成,Al2O3主要分布在晶界处;随着Al2O3含量的增多,复合材料的硬度逐渐增大,抗弯强度明显降低;当Al2O3质量分数为20%时,复合材料的耐磨性能得到了明显改善;与外加20%Al2O3制备的复合材料相比,原位合成Al2O3制备的复合材料具有较高的硬度和强度,在室温和200,800℃下的磨损率稍低。
The Fe-28Al-5Cr matrix composites with 10% Al2O3 and 20% Al2O3 were prepared by in-situ reaction combined with hot-pressing sintering process. Their phase, microstructure and mechanical properties were investigated. The effects of room temperature and 200,400,600,800 ℃ The friction and wear properties were compared with those of the same composites prepared by the addition of Al2O3. The results show that the composites prepared by in-situ synthesis of Al 2 O 3 are composed of two phases, Fe 3 Al and Al 2 O 3, and Al 2 O 3 mainly distributes at the grain boundaries. With the increase of Al 2 O 3 content, the hardness of composites increases and the flexural strength decreases remarkably. At 20%, the wear resistance of the composites has been significantly improved. Compared with the composites prepared with 20% Al2O3, the composites prepared by in-situ synthesis of Al2O3 have higher hardness and strength, The wear rate is slightly lower at ° C.