Powder Preparation and Microstructure for Nano-Sized Metallic Iron Dispersed MgO Based Nanocomposites with Ferromagnetic Response
Powder Preparation and Microstructure for Nano-Sized Metallic Iron Dispersed MgO Based Nanocomposites with Ferromagnetic Response
复制标题
具有铁磁响应的纳米金属铁分散MgO基纳米复合材料的粉末制备和微观结构
DOI：
10.2109/jcersj.108.1261_781
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发表时间：
2000
影响因子：
1.1
通讯作者：
K. Niihara
中科院分区：
文献类型：
--
作者：
T. Nakayama;Y. Choa;T. Sekino;K. Niihara
以氧化镁和氧化铁混合粉末为原料，采用还原/烧结法制备了体积分数为40%的铁磁性铁粉分散体的氧化镁基纳米复合材料。通过溶液化学法制备了氧化物粉末混合物，以获得合适的陶瓷/金属纳米复合材料的微观结构。将硝酸铁作为金属分散体的来源，溶解于乙醇中，并与氧化镁粉末混合。在空气中焙烧后，混合粉中的氧化铁被氢气还原。采用脉冲电流烧结(PECS)工艺制备了致密的纳米复合材料。利用热重-差热分析(TG-DTA)和X射线衍射仪(X射线衍射仪)对合成的粉末进行了物相分析，分析了焙烧温度和还原过程对产物的影响。根据这种制备工艺，成功地制备了具有增强断裂韧性和铁磁响应的氧化镁/铁纳米复合材料。
MgO based nanocomposites including ferromagnetic iron particle dispersions, with a volume content <40 vol%, were fabricated by a reduction/sintering of MgO and iron oxide powder mixtures. The oxide powder mixtures were prepared by solution chemical processes to obtain a suitable microstructure of ceramic/metal nanocomposites. Iron-nitrate as a source of metal dispersion was dissolved into alcohol and mixed with MgO powder. After calcination in air, the iron oxide in the powder mixture was reduced by hydrogen. Dense nanocomposites were obtained by pulse electric current sintering (PECS) process. Phase analysis of the synthesized powders as a function of calcination temperature and reduction process was carried out using a system for thermogravimetry and differential thermal analysis (TG-DTA), concurrently with X-ray diffraction (XRD) analysis. According to this preparation process, an MgO/Fe nanocomposite material with enhanced fracture toughness and ferromagnetic responses was successfully fabricated.