纳米CeO_2/Galfan复合材料的制备工艺

Fabrication Process of Nano-CeO_2 Particulates/Galfan Composites

在不同介质中分别用球磨和超声振动对纳米C eO2颗粒进行了预处理;用搅熔铸造工艺制备了质量分数约为1%的纳米C eO2/G a lfan复合材料,用XRD(X-ray d iffration)分析了其中的物相,用场发射扫描电镜(F ie ldem iss ion scann ing e lectron m icroscopy,FE-SEM)观察了纳米C eO2颗粒在基体中的分散情况,并测试了其显微硬度;用中性盐雾腐蚀试验来评价复合材料的耐蚀性,并用XRD检测了腐蚀产物。结果表明,经超声预处理的颗粒与熔体具有较好的润湿性,能单粒分散其中,且制备的复合材料的显微硬度值提高了近一倍。

Pretreatment processes, including ball-milling and ultrasonic processing, are used to disperse aggregated nano-CeO2 particulates in different mediums. Firstly nano-CeO2/Galfan composite material with the mass fraction 1% is fabricated by using compocasting process. Secondly, phases in the composites are confirmed by XRD （X-ray diffration） and the dispersion of nano-CeO2 particulates in composites is observed by FE-SEM. Then, micro-Vickers hardness values of composite samples are tested. Finally, the corrosion resistance of samples is evaluated by neuter salt-spray tests and corrosion products are confirmed by XRD. Results show that pretreated particles have the better wettability with the molten alloy and single particle distributes in the molten Galfan alloy. Compared with the Galfan, the hardness of the composite reinforced with such pretreated particulates approximately increases by 100% and its corrosion resistance is improved.