胞状结构NiFe_2O_4/Ni金属陶瓷的制备及性能

Preparation and properties of NiFe_2O_4/Ni cermets with celluar structure

采用结构功能化设计理念,使用共挤压成形工艺制备具有胞状结构的NiFe2O4/Ni金属陶瓷坯体。试样在1 350℃的氮气气氛下进行烧结。结果表明,在构造胞状结构过程中,有机添加剂起到了粉末流动载体及对坯件的保形作用。对所得试样导电性能及力学性能的分析结果表明,与同等Ni含量NiFe2O4/Ni均匀体试样相比,胞状结构试样的电导率有显著提高且与富Ni层中的金属含量有关;虽然胞状结构材料的抗弯强度高于同等金属含量NiFe2O4/Ni均匀体,但随着富Ni层金属含量的提高材料的抗弯强度呈下降趋势。

The NiFe2O4/Ni cermets with cellular microstructure were prepared by the co-extrusion forming process based on the concept of functionally design. The microstructure, conductivity and mechanical properties were investigated using the samples sintered at 1 350 ℃ in N2 atmosphere. The results indicate that the chosen additive is the carrier of powder and has a good effect of holding shape in co-extrusion process. The conductivity of the sample with cellular microstructure is higher than that of the conventional material with similar Ni content, and the conductivity increases with the increasing Ni content of rich metal layers. Although the bending strength of the sample with cellular microstructure is higher than that of conventional material with similar Ni content, it decreases with the increasing Ni content of rich metal layers.