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以NiO、Fe2O3和Cu、Fe、Ni为主要原料,采用两步固相烧结法,制备出Cu-NiFe2O4和Cu-Ni-Fe-NiFe2O4金属陶瓷试样。用阿基米德排水法测试样密度,并结合XRD和SEM分析其微观结构,测量了试样的静态热腐蚀率、抗热震性和电导率。研究表明,与Cu-NiFe2O4金属陶瓷比较,金属Fe、Ni的加入能够起到晶粒细化、提高致密度的作用,同时使Cu与陶瓷的润湿性得到改善。Cu-Ni-Fe-NiFe2O4试样在冰晶石熔盐中的静态热腐蚀率有所降低,而抗热震性有较大提高。电导率也有一定提高,原因是由于金属相均匀的分散于陶瓷相中,减小了晶界间的势垒作用,从而使载流子更易通过晶界。
The samples of Cu-NiFe2O4 and Cu-Ni-Fe-NiFe2O4 cermet with NiO, Fe2O3 and Cu, Fe and Ni as the main raw materials were prepared by two-step solid-state sintering method. The sample density was measured by Archimedes dewatering method. The microstructure was analyzed by XRD and SEM. The static thermal corrosion rate, thermal shock resistance and electrical conductivity were measured. The results show that compared with Cu-NiFe2O4 cermet, the addition of Fe and Ni can improve the grain refinement, increase the density and improve the wettability of Cu and ceramic. The static thermal corrosion rate of Cu-Ni-Fe-NiFe2O4 samples in cryolite molten salt decreases, while the thermal shock resistance increases greatly. Conductivity also has a certain increase, because the metal phase evenly dispersed in the ceramic phase, reducing the potential barrier between the grain boundaries, so that carriers more easily through the grain boundary.